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Introduction Do you use Raspberry Pi? or What are doing with it? Is it a microcontroller (MCU for microcontroller unit) or microcomputer? or SoC (system-on-chip)? As a beginner, is it better to buy a microcontroller or a Raspberry Pi? Look at the following content. Raspberry Pi Explained Catalog Introduction Ⅰ Basic Definition Ⅱ Raspberry Pi vs MCU Ⅲ What Can We Do with Raspberry Pi? Ⅳ Where do I start to Learn Raspberry Pi? Ⅴ FAQ Ⅰ Basic Definition Raspberry Pi is actually a tiny embedded computer. It uses ARM microcontroller chip, and linux operating system or windows. It can regard as a small desktop computer when connects with a monitor, keyboard, and network (network port or wifi). With the release of Windows 10 IoT, Raspberry Pi can also run Windows.The single-chip microcomputer refers to the central processing unit core with some peripheral interface circuits on it, which is also called the microcontroller unit (MCU), or SoC. 8051 chips, avr chips, arm chips, etc. are all called single-chip microcontrollers, while Intel’s 80x86 series are central processing unit (CPU) and cannot be called MCU.It uses very large-scale integrated circuit technology to integrate the central processing unit CPU with data processing capabilities, RAM, ROM, multiple I/O ports and interrupt systems, timers/counters and other functions (may also include display driving circuits, pulse width modulation circuits, analog multiplexers, A/D converters and other circuits) are integrated on a silicon chip to form a small and complete microcomputer system. It is widely used in the field of industrial control. Figure 1. Raspberry Pi Setting Ⅱ Raspberry Pi vs MCU Next, let's take a look at the difference between the Raspberry Pi and the MCU and introduce in detail what can we do with the Raspberry Pi?The single-chip microcomputer is an microcontroller, and the Raspberry Pi is a single-board computer with arm-architecture processor. Early MCUs were peripherals for ROM and IO with slow speed, and it could not run time-sharing operating systems such as Linux or Windows. But the Raspberry Pi can run an operating system like Linux, or deploy servers or cloud computing. That is, the Raspberry Pi can perform many operations that cannot be done by a single-chip microcomputer.The size of the single-chip microcomputer is relatively small, and the internal chip is used as a computer system. Its structure is simple, but the function is perfect, it is very convenient to use, and it can be modularized. The most important thing is that although the development cycle of the single-chip microcomputer is relatively short, it is basically based on a specific task and the code must be re-programmed every time, which is very troublesome.The Raspberry Pi is actually a computer motherboard. It can be programmed, compiled, and run directly locally. If you want to add or delete functions to the original program, or switch from the current task to a different new task, you do not need to burn programs like a single-chip microcomputer according to different tasks or updates. Use Raspberry Pi to control peripherals by operating GPIO basically through various libraries, and if you connect it to the Internet, you can operate it remotely. Figure 2. Raspberry Pi GPIO In general, each has its own advantages. The MCU is cheap and suitable for general consumer products. After all, the Raspberry Pi is a card-type computer with an embedded operating system running on it. That is, a low-power general-purpose computer. For electronic geeks, the back-end data processing and GUI for complex control systems are still very good for satisfying embedded learning. Ⅲ What Can We Do with Raspberry Pi? After reading the above, since Raspberry Pi has the features of a computer, this means you’re able to do most things a desktop computer can do such as document editing, playing HD video, playing games, coding and much more.Obviously it won’t have as much power as a desktop PC but since it is a lot cheaper they make for great little computers you can play around with.Here lists some items you can do:1) Wireless HotspotUsing the Internet cable and USB wireless network card, after configuration, it can be used as a wireless hotspot.2) Mechanical ProsthesesMIT Media Lab researchers use it as a controller for mechanical prostheses.3) Easy Homemade NotebookConnect the Raspberry Pi to the LCD panel, add the mouse, keyboard and power supply, and find a beautiful case and put it on, finally it becomes a simple homemade notebook.4) WiFi CarAn IBM engineer installed it on a model car, and then used WiFi signals to control the car’s actions.5) Send Dynamics RemotelyWeather enthusiasts tied it to a detection balloon and used it to send a tweet in the stratosphere.6) Control Door SwitchThere are also people who use the Raspberry Pi to control the garage door and combine it with Siri to remotely control the garage switch.7) Surveillance ShootingA camera is connected as a small shooting device, which is small in size and easy to hide.8) Back Up EmailsOne of the most important functions of my Raspberry Pi is to back up emails. Use a software called getmail to check every mail using POP or IMAP protocol, and check the mail of each account regularly. Then save the email to an mbox file, which can be copied to another computer at any time for long-term email archiving.9) Build a RSS ReaderMiniflux, a self-hosted web-based RSS client that can be installed on the Raspberry Pi. Like many people, when Google announced that it would close Google Reader on July 1st, I also started to migrate personal data. I used rss2email for a while and let it send every item of RSS to my mailbox. But in fact, I don't like this method very much, so I spent some time looking for alternatives to Google Reader and tried rss2email and found miniflux finally. Installing miniflux on the Raspberry Pi is very simple, you only need to install PHP and a web server software in advance, such as nginx or Apache.10) Build a WebsiteOne obvious use of Raspberry Pi is as a backend server for websites. Because it has enough capacity to handle static websites, some web frameworks are not a problem. I built a Flask framework on it, and I even heard that some people built a Wordpress directly on the Raspberry Pi.11) Home Network StorageOnly consumes very low power, Raspberry Pi can become a perfect NAS (Network Attached Storage). Before I connected a 500GB laptop hard drive to the Raspberry Pi and installed an operating system on it. I can store many files on it that need to be transferred between different computers. Then connect via SFTP, you can access it on any machine at home (even if you are not at home, it will not be a problem as long as the routing settings are correct). You can also install Samba on your Pi so that both Mac and PC can access it more easily.12) Site MonitoringUse Raspberry Pi is to detect websites that are important to me. I wrote a Python script and ran it regularly to make sure that these websites responded with a 200 status code (which means everything is normal). If the script determines that there is a problem with the website or cannot be accessed, it will email me the overall situation of the incident. The Python module I use is Requests, and the email module is smtplib.13) Event ReminderUse Raspberry Pi to email me important events that I need to remember. I used Google Calendar before, but I only use it for simple events. So I replaced it with a Raspberry Pi, and a Python script for timed tasks is enough. I set the date, time, and message to remember. These parameters will be passed to my Python script, and on that day it will send the message to my mailbox to remind me of the day’s events.14) Family AlbumMy Raspberry Pi also supports a private website that contains all my family photos. I set up verification information so only people I want them to see can enter the site. This is much more reliable than your Facebook photo album, because your account on Facebook may be deleted, and the photos will be seen by strangers by chance. Here is a method, just use PHP to get the photos in a folder on the Raspberry Pi.15) JukeboxI mentioned above that I use Pi as a network storage, so all my music is also on it. I connected a stereo speaker to my Pi and used mpg123 to play music on the command line of the Raspberry Pi. Although there are many other mp3 players and graphical interfaces, I still choose mpg123 because it is easy to install and use. Figure 3. Raspberry Pi Projects Ⅳ Where do I start to Learn Raspberry Pi? If you are really interested in it and want to get started. How, and what do you need? 1) A Raspberry Pi. So, obviously you’ll need he actual board. If you don’t have it, you cant really do what you want. So find a website or store and buy one. Depending on the type and model you get, they can range from as low as 10$ to 50$. Pretty affordable.2) A monitor. So, you don’t actually need a monitor. But it is going to be so much easier. You can actually buy displays the Pi company has made specifically made for the Pi. These however are a little more expensive.You could also use your TV as a monitor, providing both the TV and the Pi can be hooked up via HDMI. VGA to HDMI would work too. Many different solutions can be used when it comes to the cable you use for a monitor, or all around screen. Adapters come in all shapes, sizes and forms. 3) A power source. You’ll need to power the Pi to use it. Most of the time, you will get a little charger to use with the Pi. Using this specific charger will probably be the best, as it will always pull enough power from the wall into your Pi.4) A mouse, and keyboard. You will need a mouse and keyboard. This is pretty much mandatory. Well, only for the actual screen portion of the Pi. Models 3 B+ and up have built in Bluetooth, so you can have cordless mouse and keyboard if you would like. That’s pretty cool.5) Depending on the model, you will need an Ethernet cable to have internet. Models 3 B+ and up have a built in WiFi chip. So you can have a wireless internet connection if you so please.6) A microSD card with the image you want to use. When you buy the Pi, you will need to have an SD card. The newer models use microSD cards. Putting the SD card into the Pi without anything on it wont do anything though, you'll need an image. Images for the Pi can be found along the internet for downloads. The standard image used for the Pi right now is NOOBS Debian.7) Time, patience and dedication. These are very important when working with the Pi. Why? Because the Pi is powerful, yet it can be confusing at times, especially for a “noob”.   Ⅴ FAQ 1. What is Raspberry Pi mainly used for?The Raspberry Pi is a low cost, credit-card sized computer that plugs into a computer monitor or TV, and uses a standard keyboard and mouse. It is a capable little device that enables people of all ages to explore computing, and to learn how to program in languages like Scratch and Python. 2. What are some good Raspberry Pi projects?Best Raspberry Pi Projects for BeginnersMusic Streaming.Security System.Weather Station.Arcade Machine.NAS.Digital Photo Frame.Retro Handheld Console.Robot. 3. Can a Raspberry Pi run Windows?The Raspberry Pi 4 can handle Microsoft Edge, the calculator app, and more, all via the power of Windows 11. It can even run Minecraft, albeit in an undesirable state. 4. Can Raspberry Pi go on Internet?If you want to connect your Raspberry Pi to the internet, you can plug an Ethernet cable into it (if you have a Raspberry Pi Zero, you'll need a USB-to-Ethernet adapter as well). If your model is a Raspberry Pi 4, Raspberry Pi 3, or Raspberry Pi Zero W, you can also connect to a wireless network. 5. How do I setup a Raspberry Pi network?Configuring the Raspberry Pi Ethernet Port With a Static IP.Step 1: Review Current Network Settings.Step 2: Backup the Current Network Configuration.Step 3: Modify the Network Settings. To edit the network setting you must edit the dhcpcd.Step 4: Restart the Raspberry Pi.Step 5: Test the New Network Setup. 6. How is Raspberry Pi different from microcontroller?The main difference between them is: Arduino is microcontroller board, while Raspberry Pi is a microprocessor based mini computer (SBC). The Microcontroller on the Arduino board contains the CPU, RAM and ROM. 7. Is Raspberry Pi zero a microcontroller?A Raspberry Pi is not a microcontroller, it is a single board computer. Neither. The chip itself is an SOC or system on chip, so it has almost all the parts of a computer on a single die. 8. Is the Raspberry Pi a system on a chip?Raspberry Pi SBCs feature a Broadcom system on a chip (SoC) with an integrated ARM-compatible central processing unit (CPU) and on-chip graphics processing unit (GPU), while Raspberry Pi Pico has a RP2040 system on chip with an integrated ARM-compatible central processing unit (CPU). 9. Can you use a microcontroller with a Raspberry Pi?Meet the Raspberry Pi Pico, a tiny little microcontroller that lets you build hardware projects with some code running on the microcontroller. Unlike computers, microcontrollers don't run traditional operating systems. 10. Is Raspberry Pi 3b a microcontroller?The Raspberry Pi is a single board computer with Microprocessor whereas Arduino is considered as Microcontroller unit. The Raspberry Pi can run an OS (Linux Distribution) and also consumes more power. Since Arduino is microcontroller device it has no operating system and can only run a single program or sketch. 11. What is Raspberry Pi used for in IoT?How can IoT Applications use Raspberry Pi? With an in-built quadcore processor, Raspberry Pi can serve as the “Internet Gateway” for IoT devices. Powered by a cloud network, Pi acts as a web server for uploading and transiting sensor data on IoT platforms. 12. What is the difference between microprocessor and microcontroller?KEY DIFFERENCESMicroprocessor consists of only a Central Processing Unit, whereas Micro Controller contains a CPU, Memory, I/O all integrated into one chip. ... Microprocessor uses an external bus to interface to RAM, ROM, and other peripherals, on the other hand, Microcontroller uses an internal controlling bus. 13. What kind of computer is Raspberry Pi?The Raspberry Pi is a low cost, credit-card sized computer that plugs into a computer monitor or TV, and uses a standard keyboard and mouse. It is a capable little device that enables people of all ages to explore computing, and to learn how to program in languages like Scratch and Python. 14. Can I use a Raspberry Pi as my main computer?Aside from the hard drive crash, the Raspberry Pi was a perfectly serviceable desktop for web browsing, writing articles, and even some light image editing. ... 4 GB of ram is just enough for a desktop. My 13 Chromium tabs, including a Youtube video, are using just over half of the 4 GB of available memory. 15. Which OS is better for Raspberry Pi?Raspbian. Raspbian is a Debian-based engineered especially for the Raspberry Pi and it is the perfect general-purpose OS for Raspberry users.

Ⅰ Introduction What exactly is a microprocessor? As our lives are becoming increasingly tech-centric and thus tech-dependent,  we have to examine this critical component closely. After all, microprocessors are built into computers, laptops, and smartphones, as well as smart home devices, gaming consoles, and self-driving cars. Microprocessors are what allow these devices to function. In this blog, we will discuss microprocessor basics and their applications across industries. Catalog Ⅰ Introduction Ⅱ What is a Microprocessor? Ⅲ Microprocessor Related Video: Ⅳ Features of Microprocessor Ⅴ Evolution of Microprocessors  Ⅵ Microprocessor Types Ⅶ Characteristics of CISC and RISC  Ⅷ Differences Between CISC and RISC Ⅸ Applications of Microprocessor 9.1 Practical Diagram Examples Ⅹ Microprocessor vs. Integrated Circuit--What’s the Difference? Ⅺ FAQ   Ⅱ What is a Microprocessor? A microprocessor is a Central Processing Unit (CPU) built on a single  Integrated Circuit  (IC) in a computer. A microcomputer is a digital computer with one microprocessor that serves as the CPU. It is a programmable, multipurpose, clock-driven, register-based electronic device that reads binary instructions from memory, accepts binary data as input, processes data according to those instructions, and outputs the results. The microprocessor is composed of millions of tiny components that work together, such as transistors, registers, and diodes. Figure1：Block Diagram of a Microcomputer  A microprocessor contains three parts: an  ALU , a control unit, and a register array. The  ALU performs arithmetic and logical operations on data from an input device or memory. The control unit manages the computer's instructions and data flow. Furthermore, a register array is composed of registers denoted by letters such as B, C, D, E, H, L, and accumulator.   Ⅲ Microprocessor Related Video: How to easily use HMC5883L Compass Sensor Microprocessor Video Description: In this video, we will understand the difference between microprocessor and microcontroller. Visually both microprocessor and microcontroller almost look identical but they are different in many aspects. They are different in terms of the application in which they are used, processing power, memory, cost and power consumption. So, in this video, you will understand the difference between microprocessor and microcontroller in all these aspects. Ⅳ Features of Microprocessor   Ⅴ Evolution of Microprocessors  We can classify microprocessors based on generation or size: First Generation (4 - bit Microprocessors  ) Intel Corporation introduced the first generation of microprocessors in 1971-1972. Because it was a 4-bit processor, it was dubbed the  Intel 4004 . It was a single-chip processor. It was capable of performing basic arithmetic and logical operations such as addition, subtraction, Boolean OR, and Boolean AND. I had a control unit that could fetch an instruction from storage memory, decode it, and then generate control pulses to execute it. Second Generation (8 - bit Microprocessor) Intel introduced the second generation of microprocessors in 1973. It was the first eight-bit microprocessor capable of performing arithmetic and logic operations on 8-bit words. It was known as the  Intel 8008 , and an improved version was known as the  Intel 8088 . Third Generation (16 - bit Microprocessor) The third generation microprocessors, introduced in 1978, were Intel's 8086, Zilog Z800, and 80286, which were 16-bit processors with minicomputer-like performance. Fourth Generation (32 - bit Microprocessors  ) The 32-bit microprocessor was introduced by several companies, but the most popular is the Intel 80386. Fifth Generation (64 - bit Microprocessors) From 1995 to the present, we have been in the fifth generation. Following 80856, Intel released a new processor, the  Pentium  processor, followed by the  Pentium Pro CPU.  which enables multiple CPU  s in a single system to achieve multiprocessing. Celeron, Dual, Quad, and Octa-Core processors are also improved, 64-bit processors.   Ⅵ Microprocessor Types Microprocessors are classified into three types: CISC (Complex Instruction Set Computer) The instructions are in a complex format, as the name implies. This means that a single instruction can contain several low-level instructions. Loading data from memory, storing data in memory, performing basic operations, and so on. Furthermore, a single instruction can have multiple addressing modes. Furthermore, because there are many operations in a single instruction, they use a small number of registers. Intel 386,  Intel 486 , Pentium, Pentium Pro, Pentium II, and other  CISC  processors are examples. RISC (Reduced Instruction Set Computer) As the name implies, the instructions in this are quite simple, and thus they execute quickly. Furthermore, the instructions are completed in a single clock cycle and only use a few addressing modes. Furthermore, it employs multiple registers, resulting in less interaction with memory. Examples include the IBM RS6000, DEC Alpha 21064, DEC Alpha 21164, and others. EPIC (Explicitly Parallel Instruction Computing) It enables parallel computation of instructions through the use of compilers. Furthermore, the complex instructions operate at lower clock frequencies. It also encodes the instructions in 128-bit bundles. Each bundle contains three instructions encoded in 41 bits each, as well as a five-bit template. This 5-bit template specifies the type of instructions and which instructions can be executed concurrently.   Ⅶ Characteristics of CISC and RISC  Characteristics of  CISC are as follows: Because the instructions are complex, so is the decoding of instructions.The size of instructions is larger than the size of a single word.It is possible for an instruction to take more than one clock cycle to execute.Because most operations are performed in memory, the number of registers is reduced.Address modes are also complicated.There are more data types. Characteristics of  RISC are as follows: Because the instruction is simple, so is the decoding of instructions.The size of the instructions is less than one word.It takes one clock cycle to execute an instruction.The number of registers has increased.The address modes are also straightforward.There are fewer data types.It has the potential to be used for pipelining.   Ⅷ Differences Between CISC and RISC RISCCISCIt focuses on the software.It focuses on the hardware.Uses the hardwired control unit.It uses a hardwired as well as a microprogrammed control unit.Uses transistors for more registers.Transistors are used for storing the complex instructions.The instructions have a fixed size.The size of instructions vary.It performs only register to register arithmetic operations.Besides the register to register operations, it can also perform register to memory or memory to register operations.Fewer registers are used.It requires more number of registers.As the instructions are individual the code is large.Multiple operations are present in single instruction hence, the code is small.Executes in one clock cycle.Takes more than one clock cycle for execution.Instructions have a size of one word.The size of instructions is greater than the one-word size.Examples are IBM RS6000, DEC Alpha 21064, DEC Alpha 21164, etc.Examples of CISC are Intel 386, Intel 486, Pentium, Pentium Pro, Pentium II, etc.     Ⅸ Applications of Microprocessor Household DevicesIndustrial Applications of MicroprocessorsTransportation IndustryComputers and ElectronicsIn MedicalsInstrumentationEntertainmentEmbedded Systems at HomeOffice Automation and PublicationCommunication   9.1 Practical Diagram Examples As stated by the term microprocessor typically refers to a microcomputer's central processing unit (CPU), which contains the arithmetic logic unit (ALU) and control units. Typically, it is implemented on a single LSI chip. This separates the operation's "brains" from the rest of the computer's units.   An example of microprocessor architecture The arithmetic logic unit (ALU) and the control unit for a microcomputer are housed in the microprocessor. It is linked to memory and I/O via buses, which transport data between the units. Figure2: microprocessor architecture     Microcomputer Example A microprocessor unit (MPU), a clock, and interfaces to memory and external input/output devices are typical components of a microcomputer. The units are linked by buses that transfer data between them. Figure3: Microcomputer   Buses: The exchange of information Information is transferred between microcomputer units via buses, which are groups of conductors. Each bit of information to be passed will have one conductor, e.g., 16 lines for a 16-bit address bus. Address, control, and data buses will be present.   Figure4: microcomputer units via buses     Ⅹ Microprocessor vs. Integrated Circuit--What’s the Difference? Integrated Circuit An integrated circuit is a semiconductor chip component that contains thousands to billions of transistors. It's difficult to imagine how this is possible, but it's not done by shrinking scores of typical 3-legged NPN transistors. An integrated circuit is instead constructed by assembling the basic structure of MOS transistors on a small piece of the silicon wafer. The MOS transistors are connected in such a way that they perform the same function as a larger setup.    Microprocessor An integrated circuit is a microprocessor, but not all integrated circuits are microprocessors. The microprocessor, like Professor X, is an intelligent piece of integrated circuits. It serves as the brain of circuits that require computing power. The first microprocessors had thousands of transistors on a silicon wafer, but the number has now reached billions. The  AMD  Epyc Rome chip, which was released in 2019, contains over 39 billion transistors. A microprocessor, unlike other integrated circuits, serves as a computing brain. It can execute logical and arithmetic instructions that have been programmed into it. A microprocessor is made up of three parts: an arithmetic and logic unit (ALU), a control unit.  and a register array.   Microprocessor vs. Integrated Circuit in Electronics Design Figure5: Mind the speed when working with a microprocessor. In electronics design, you're likely to work with integrated circuits. Working with a microprocessor can be a herculean task on occasion. It's a mistake to think that designing with a microprocessor is the same as designing with traditional integrated circuits. If you skip a couple of best practices in PCB design, you can still create a successful design if you're working with common ICs like differential transceivers or logic gates. In terms of power supply and speed, these passive ICs are typically quite robust. However, if you make the same mistakes in a design with a microprocessor, you will almost certainly encounter a slew of problems in the prototype. Microprocessors are notoriously power-hungry devices that typically operate at hundreds of Hertz or Gigahertz. It should go without saying that a microprocessor is extremely sensitive to the voltage applied to it. Ripples or a sudden drop in voltage can have a significant impact on the microprocessor's stability. Because the microprocessor communicates with memory via high-speed data buses, EMI is also a concern. High-speed data exchange can be a source of EMI, affecting nearby sensitive components. When designing with a microprocessor, you can't afford to make even the smallest mistake, so using the right PCB design and analysis software is essential. Cadence OrCAD supports high-speed signal simulation to identify problems early in the design process, as well as a plethora of other tools to help you get the job done right the first time.   Ⅺ FAQ 1. What is microprocessor in simple terms? A microprocessor is an electronic component that is used by a computer to do its work. It is a central processing unit on a single integrated circuit chip containing millions of very small components including transistors, resistors, and diodes that work together. 2. Are microprocessors used today? One or more microprocessors are used today in everything from the smallest embedded systems and handheld devices to the largest mainframes and supercomputers. 3. Are microprocessors in phones? Smartphones and other mobile devices have multiple microprocessors and microcontrollers. The main processor is a microprocessor with a bus to communicate with memory on separate chips (although often included in the same IC package) and buses to communicate with the rest of the equipment. 4. Do phones have RAM? Android phones have jumped from 4GB to 8GB RAM as standard, and we're now seeing phones with 12GB and 16GB of RAM — but Apple's iPhone has always gotten by with less. 5. How do microprocessors execute instructions? The instructions which are to be executed by microprocessor are first stored in the memory of the processor and then executed. But the processor does not execute the instructions directly. It reads the instruction byte by byte and then executes it. 6. What is microprocessor chips? Microprocessor chips (MPU) are silicon devices that serve as the central processing unit (CPU) in computers. They contain thousands of electronic components and use a collection of machine instructions to perform mathematical operations and move data from one memory location to another.

ⅠIntroduction This project mainly introduces how to DIY a Simple Audio Player with  Amplifier LM386 . But before this project, it is very essential to know some basics of LM386. Therefore, the first of this article is about LM386 audio amplifiers and the second part we will have a look at the practical appliance of Simple Audio Player with Amplifier LM386. Catalog ⅠIntroduction Ⅱ Amplifier LM386 Related Video: Ⅲ LM386 Basics 3.1 LM386 Datasheet 3.2 LM386 Pinout 3.3 LM386 Features Ⅳ  Project Introduction 4.1 Hardware Required 4.2 Getting Ready with Your WAV Audio Files: 4.3 Circuit 4.4 Code 4.5 Working of this Arduino Music Player: Ⅴ FAQ How to make an LM386 audio amplifier circuit Amplifier LM386 Video Description: In this Video, We will explore how to use the popular LM386 class AB audio amplifier IC to build a simple mono 1 watt audio amplifier.  Ⅲ LM386 Basics Despite the fact that LM386 audio amplifiers are quite old. They do, however, have a lot of useful information. Assume your audio player has poor sound quality. You want to boost the volume. They are a good option. Because of the low voltage supply and the fact that it works well with a battery.   3.1 LM386 Datasheet You completed an audio circuit  . However, the sound is too faint. Many people use the LM386 to boost the sound to a speaker. The LM386 is a low-power audio amplifier. Also, you should be able to work with a battery,  It has a similar shape to  IC-741  and DIP-8. So, small and simple. Even if it's small, it makes a big sound. But...better. it's If you have previously read the LM386 Datasheet.   3.2 LM386 Pinout Figure1:pinout In DIP-8, we frequently use the LM386. There are only a few pin connections. Other packets are also the same. For example, SOP-8, TSSOP-8, and so on.   3.3 LM386 Features   Ⅳ  Project Introduction Including sounds or music in our project will always make it look and sound much more appealing. If you're working with an  Arduino  and have a lot of free spins, you can easily add sound effects to your project by purchasing an extra SD card module and a standard speaker. In this article, I'll show you how to play music and add sound effects with your  Arduino board, as well as introduce the IC LM386 Amplifier  , which we'll use in this process. We will play the.wav music files stored on an SD card in this project. The Arduino will be programmed to read these.wav files and play the audio on a speak through an LM386 Audio amplifier.   Figure2: Project     4.1 Hardware Required Arduino Due Board8-ohm speaker or headphonesArduino shield with an SD card with cs CS 4 (like the Ethernet shield)Components to build an external audio amplifierLM386 (low power audio amplifier)10 kohm potentiometer10 ohm resistor2 x 10 µF capacitor0.05 µF (or 0.1 µF) capacitor250 µF capacitor   4.2 Getting Ready with Your WAV Audio Files: The audio file to be stored on the SD card must be in.wav format and have 44100 Hz, 16-bit stereo quality. We need audio files in.wav format to play sounds from an SD card using Arduino because the Arduino Board can only play audio files in a specific format, which is wav format. There are many mp3 shields available for use with Arduino to create an Arduino mp3 player. Alternatively, to play mp3 files in Arduino, there are websites that will convert any audio file on your computer into that specific WAV file.   4.3 Circuit The shield is placed on top of the Due, and a micro-SD card is inserted into the slot. The card's root directory contains a.wav file called "test.wav." For a quick test, connect a pair of headphones to the ground and DAC0 while keeping the polarity in mind. To add a speaker to the board, connect an amplification circuit between the DAC0 pin and the speaker. The amplification circuit will boost the speaker's volume,  There are numerous audio amplifiers available, with the LM386 being one of the most common. The following scheme demonstrates how to construct the circuit using the LM386 and a variety of components. You can power the LM386 by connecting the Vs pin to various voltage sources, such as the +5 V on the Arduino Due's 5V pin or an external 9V  battery,  The capacitor is connected to pins 1 and 8 of the LM386 provides the amplifier's gain. The gain is set to 200 with the 10 F capacitor, and 50 without the capacitor. The volume of the amplifier can be adjusted using the potentiometer. Caution: Do not connect the speaker directly to the Arduino Due's pins.   Figure3 : Circuit   Figure4: LM386 mounting on breadboard   4.4 Code   4.5 Working of this Arduino Music Player: Simply press the button connected to pin 2 after programming your Arduino, and your Arduino will play the first song (saved as 1.wav) for you. You can now press the button again to change your track to the next song, 2.wav. Similarly, you can listen to all four songs. You can also play/pause the song by pressing the pin 3 button. Press it once to pause the song and once more to resume it from where it left off. Watch the video below to see the entire process in action (or maybe to relax with some songs). I hope you had a good time with the project. It is now up to your imagination to incorporate them into your projects. You can create a speaking clock, voice assistant, talking robot, voice alert security system, and many other things.   Ⅴ FAQ 1. How many watts is LM386? 700mW, mono, 5- to 18-V, analog input Class-AB audio amplifier. 2. How do you calculate LM386 gain? Voltage Gain Analysis: Without any external components, it has a gain of Gv = 2x15K/(150+1350) = 20 (26 dB). With a capacitor (or shortcutting) between pins 1 and 8 , it has a gain of Gv = 2x15K/150 =200 (46dB). 3. Is LM386 any good? The LM386 is a well-designed, basic workhorse that does a decent job when its hooves are kept clean and it's well-fed. Aside from having a slow op-amp stage by today's standards, it has decent performance. It can also sound horrible if you neglect it. 4. What is an audio amplifier circuit? The circuit of the audio amplifier consists of a transistor a device to apply the input signals and a speaker at the output. The transistors are connected based on the necessity. The important factors that need to be considered while designing a audio amplifier is gain,noise, frequency response and distortion. 5. Which amplifier can be used for audio amplifier? An audio power amplifier (or power amp) is an electronic amplifier that amplifies low-power electronic audio signals such as the signal from radio receiver or electric guitar pickup to a level that is high enough for driving loudspeakers or headphones. 6. What is the need of power amplifier? The function of a power amplifier is to raise the power level of input signal. It is required to deliver a large amount of power and has to handle large current. The characteristics of a power amplifier are as follows − The base of transistor is made thicken to handle large currents.

IntroductionNow face masks are necessary elements during the COVID. In practice, they are intended for one-time use, and to a large extent, it is environment unfriendly. Also during a shortage, repeated use is inevitable and it is necessary to have a disinfection mechanism. During the ongoing SARS-CoV-2 pandemic, hospitals, medical centers, and research institutions implemented different disinfection methods for these masks, usually involving ultraviolet germicidal exposure (UVGI) or some kind of heating methods. Nevertheless, these methods are not suitable for many ordinary people. What’s more, due to shortages, the reuse of these masks has become the only option. There is evidence that SARS-CoV-2 still exists on the surface of surgical masks even after 7 days, so the demand for feasible mask disinfection methods has further increased. Here will introduce a special device to do that.Introduction: Understanding the CoronavirusCatalogIntroductionⅠ Disinfection Device Production InstructionsⅡ Device Design Processes2.1 Device Size2.2 Thermal Test2.3 Box Lid Design2.4 UV-C System2.5 Making the Mask PlacementⅢ Set Up Arduino and Sensor3.1 Arduino Overview3.2 Material3.3 Sensors Installation3.4 Arduino Control3.5 AlarmⅣ Using GuideⅤ Temperature Cycle5.1 Heat Inactivation of Viruses5.2 Security ConsiderationsⅥ ConclusionⅠ Disinfection Device Production InstructionsThe device aims to create a low-cost portable device that can effectively use UVGI and dry heat to disinfect masks carry SARS-CoV virions, and can be easily operated by those who need it.Device Setup DiagramFigure 1. Device Setup Diagram1) The temperature must be kept within 65±5℃.2) The lamp must provide UV-C wavelength. UVC bulbs that emit very short ultraviolet wavelengths from 100 to 280 nanometers that damages the DNA of bacteria, viruses, and other pathogens. You should be careful, ultraviolet C is the most dangerous type of ultraviolet light in terms of its potential to harm life on earth.3) The duration of the disinfection cycle is at least 30 minutes. Because coronavirus is more sensitive to heat. A temperature of 56 degrees can kill the coronavirus within 30 minutes. So no more than 30 minutes to avoid potential mask degradation and function losses.Figure 2. Device Operational DisplayFigure 3. Device Physical ViewⅡ Device Design Processes2.1 Device SizeFigure 4. Device Size2.2 Thermal TestFigure 5. Thermal Test DiagramFigure 6. Test with ThermometerFigure 7. Test Boite Temperature Manufacturing of heating system:1) A frying pan with a diameter of 22cm (induction compatible) without handle.2) Cover the frying pan with aluminum foil to reflect UV-C light.3) Make a 20cm hole in the center of the bottom surface of the box.4) In order to maintain the position of the frying pan, please use four metal brackets as shown in the figure.Figure 8. Frying PanNote: The frying pan should not close to the wood of the box because it will reduce the thermal efficiency. Therefore, you must select the appropriate hole diameter and shape the metal bracket according to the following figure:Figure 9. Frying Pan Installation Diagram 2.3 Box Lid DesignFigure 10. Box Lid Design2.4 UV-C SystemFigure 11. UV-C LampFor the UV-C source in this device, it is an 11W bulb from household aquarium. As shown in the picture, the UV-C bulb is taken out and installed on the top cove. The installation method of the bulb is to make 4 holes in the top cover, and use the cable tie/cable tie and soft cushion to fix the bulb firmly. And the top surface is covered with aluminum to reflect ultraviolet radiation.You can feel free to use UV-C lamps from other sources. However, if you cannot access the crystal tube (used in this project), please do not use glass as a substitute, because glass will block ultraviolet radiation.2.5 Making the Mask PlacementThe mask will be placed on top of the metal frame. The I wire frame is made of thin copper wires, and each wire has 30mm spacing apart. The wire stand is located 120mm above the bottom surface. Next secure the wire racks together by passing the wires through the small holes on the front and back surfaces of the box.Figure 12. Mask PlacementⅢ Set Up Arduino and Sensor3.1 Arduino OverviewFigure 13. Arduino Overview3.2 MaterialArduino UNO Rev3Grove Basic Shield V2, 0Infrared temperature sensorLight SensorPush ButtonPiezo SpeakersFour-digit LED DisplayAdapter power supply DC 12V3.3 Sensors InstallationFigure 14. Sensor Introduction3.4 Arduino ControlINIT: In this state, the LED display indicates the temperature, but you have to wait for it to reach the threshold (70℃) before starting cycle counting in the COUNT state.Count: The number of minutes from 30 to 0 is displayed on the LED display next to the temperature digits. Additionally, in the case of too low temperature, or if the UV lamp is turned off, the status will change to ERR.END: This is the normal state at the end of the elapsed time. The speaker will remind. Press the button to enter INIT again.ERR: This is an error state, if the temperature is too low or the UV lamp is turned off, it will run. In terms of it, repeat the last step above.Code Download: LED Backpack Libraries and Arduino Wiring.3.5 AlarmIn fact, there are few alarm conditions. If the alarm is on, there will be a specific sequence on the speaker and a message will be displayed on the screen.Alarm condition: If the system is in ERR state (mentioned above) or the temperature is too high (over 75℃).Figure 15. Alarm System Diagram Ⅳ Using Guide1) Put the box on top of the induction (or resistance) stove.2) Turn on the power of Arduino.3) Close the box and start heating at 70~80% of the power of the induction cooker.4) Wait until the temperature reaches 60℃, and then reduce the variable power of the induction cooker to 30%.5) Now you can open the device, put the mask in and close it.7) Press the button to start, the remaining time (30 minutes) should be displayed.8) From now on, you need to wait 30 minutes, and there will be a signal on the speaker.9) If you want to restart a new cycle from the initial state, just press the button.Note: When the timer is counting the elapsed time, the dots between the Timer and Temperature displays will flash at 1 second intervals. Ⅴ Temperature CycleFigure 16. First Heat CycleFigure 17. Cycle with Opening-Closing 5.1 Heat Inactivation of VirusesSince the time of Pasteur, people have known the ability to remove microorganisms through moist heat, usually below 100℃. In this device, we implemented dry heat, which is reported to be effective in eliminating the infectivity of SARS-CoV. The analysis showed that the virus is largely inactivated within 30-90 minutes at 56℃, almost completely inactivated at 65℃ in 20-60 minutes, and at 75℃ in 30-45 minutes. In addition, a recent study showed that SARS-CoV-2 will lose all its infectivity at 56℃ after 30 minutes or at 70℃ after 5 minutes.According to these evidences and additional considerations regarding the effects of these disinfection methods on the function of the mask, we decided to set the heat exposure of the protocol used with the equipment to 65℃/30 minutes.5.2 Security Considerations• UVC radiation is harmful to human skin and eyes, so the UVC bulb should only be turned on when the box is completely closed.• Be careful with the metal parts of the box, they may be very hot after heating and may burn your skin when you touch them directly. Ⅵ ConclusionTaking into account the collected evidence and the technical details of the equipment, we decided to set the disinfection protocol to UVC irradiation for 30 minutes and 65±5℃ dry heat. In addition, the time required for the device should reach the required temperature and light intensity, which must be calculated. Using these specifications of UVC or heating alone should be sufficient to eliminate almost all SARS-CoV-2 infectivity, and the simultaneous action of the two should increase the effectiveness to reach a safer level.According to the available scientific evidence, the disinfection program may eliminate almost all SARS-CoV infectivity and will certainly make the masks safer to reuse than without any disinfection. However, it is designed in good faith and to the best of professional knowledge and ability, but the following must be stated:The use of this equipment to inactivate SARS-CoV-2 has not yet undergone proper laboratory testing, and it is impossible to confidently confirm the actual impact on the filtering capacity of the mask in advance.

Introduction Latching relay is a new type of relay and also an automatic switch. Like other electromagnetic relays, it turns on and off the circuit automatically. The difference is that the normally closed or normally open state of it is completely dependent on the action of permanent magnets, and the switching state of it is triggered by a pulse electric signal of a certain width. It has the characteristics of power saving, stable performance, small size, large carrying capacity, and superior performance than general relays. Latching Relay Basics in 2 Minutes Catalog Introduction Ⅰ Working Principle 1.1 Action Principle 1.2 Action Process Ⅱ Main Functions and Advantages 2.1 Average View 2.2 Function Lists 2.3 Application Area Lists 2.4 Latching Relay Advantages Ⅲ Tech Parameters Ⅳ Latching Relay Test 4.1 Measuring Contact Resistance 4.2 Measuring Coil Resistance 4.3 Set Voltage and Current 4.4 Reset Voltage and Current Ⅴ Relay Selection 5.1 The Necessary Conditions 5.2 Relevant Information Search 5.3 Installation Layout Consideration Ⅵ FAQ Ⅰ Working Principle 1.1 Action Principle The on and off state of the latching relay is usually held by the magnetic force generated by the permanent magnet. When the contacts of the relay need to be opened or closed, only the positive (reverse) DC pulse voltage is needed to excite the coil, and the relay completes the state transition between opening and closing in an instant. Usually when the contact is in the holding state, the coil does not need to continue to be energized, and the state of the relay can be maintained unchanged only by the permanent magnet force.   1.2 Action Process When the contacts of the relay need to be set, it is only necessary to excite the coil J2 with a positive DC pulse voltage. The magnetic poles generated by the coil J2 after excitation interact with the magnetic poles of the permanent magnet. As we all known, the same polarities repel each other, but the opposite polarities attract each other. The state transition from reset to set is completed in an instant. The following schematic diagrams demonstrates the specific state transition process. The process of the latching relay changing from the set state to the reset state, which are the same. Figure 1. Reset Latching Relay Figure 2. Constant-Current Pulse Monment Figure 3. Constant-Current Pulse Monment Figure 4. Latching Relay Reset   Ⅱ Main Functions and Advantages 2.1 Average View Latching relay is an automatic switching element with isolation function. It is widely used in remote control, telemetry, communication, automatic control, mechatronics and power electronic equipment. It is one of the most important control elements in electricity.Magnetic latching relays generally have an induction mechanism (input part) that can reflect certain input variables (such as current, voltage, power, impedance, frequency, temperature, pressure, speed, light, etc.). It has the ability to turn on/off the controlled circuit. In addition, between the input part and output part of the relay, there is an intermediate mechanism (drive part) for coupling and isolating the input, functional processing and driving the output part. 2.2 Function Lists The latching relay has the following functions:1) ExpansionFor example, when the control signal of a multi-contact relay reaches a certain value, multiple circuits can be switched, disconnected, and connected at the same time according to different forms of contact groups.2) AmplificationFor example, magnetic latching relays can control a large-power circuit with a very small control quantity.3) IntegrationFor example, when a plurality of control signals are input to a multi-winding relay in a prescribed form, they will be compared and integrated to achieve a predetermined control effect.4) Automation, remote control and monitoringFor example, on the automatic device and other electrical appliances, magnetic latching relays can form a program control circuit to realize automatic operation. 2.3 Application Area Lists 1) Smart meters: IC card meters, prepaid meters, single-phase meters, three-phase meters.2) Reactive power compensation: synchronous switch, composite switch, smart capacitor.3) Intelligent control: smart home, solar street light control, automation equipment, etc. 2.4 Latching Relay Advantages 1) They only need pulse excitation, and can work with single and double coils.2) Small size, easy installation.3) Low power consumption and strong load capacity.4) Safe and reliable, long service life. Figure 5. General Relay Structure Ⅲ Tech Parameters 1) Rated VoltageIt refers to the voltage required by the coil when the relay is working normally. Depending on the model of the relay, it can be AC voltage or DC voltage.2) DC ResistanceIt refers to the DC resistance of the relay coil, which can be measured by a multimeter.3) Pull-in CurrentIt refers to the minimum current that the relay can produce the pull-in action. In normal use, the given current must be slightly larger than the pull-in current, so that the relay can work stably. As for the working voltage applied to the coil, generally do not exceed 1.5 times the rated working voltage, otherwise it will generate a larger current and burn the coil.4) Release CurrentIt refers to the maximum current that the relay generates to release the action. When the current in the pull-in state of the relay is reduced to a certain level, it will return to the unpowered release state. The current at this time is much smaller than the pull-in current.5) Switch Voltage and CurrentThis refers to the voltage and current that the relay allows to load. It determines the magnitude of the voltage and current that the relay can control, and you cannot be exceeded this value during use, otherwise it is easy to damage the contacts of the relay.6) Coil Resistance RThe resistance produced by winding a T circle with an enameled wire with a diameter of Φ: R=￡*(T/Φ).7) TemperatureThe higher the temperature, the greater the resistance, and the lower the resistance, the smaller the resistance. Generally speaking, the coil resistance refers to the coil resistance at 20°C. When the temperature is higher or lower than 20℃, there is a calculation formula: Rt=R20[1+(T℃-20℃)×0.004].8) Contact Resistance CRIt is the resistance between the contacts of the relay. And it is the sum of the shrinkage resistance Re and the surface film resistance Rf: Rk=Re+Rf.Note:🔺The factors that form shrinkage resistance Re:♦️The size of the contact pressure determines the size of the shrink resistance. The relationship between the two is inversely proportional, the greater the contact pressure, the smaller the shrinkage resistance.🔺The factors that form the surface film resistance Rf:♦️Dust in the air.♦️Harmful gases in the air: H2S, SO2, etc.♦️Organic vapor in the air: plastic, glue and rosin.♦️Oil stains on the contact surface during the production process.9) Pull-in VoltageThe minimum voltage required to close the relay contacts.10) Release voltageThe minimum voltage required to open the relay contacts.11) Insulation ResistanceThe resistance value that appears when measured with a specified DC voltage between conductive parts that are insulated from each other.12) Medium Withstand VoltageAlso known as dielectric degree, it refers to the maximum voltage that can withstand between two conductive parts without breakdown.13) Reversing RetentionThe minimum force applied on the armature assembly handle to open or close the contacts.14) Contact PressureThe interaction force generated between the moving and static contacts is equal to the contact pressure equal to the reaction force generated by the over-travel of the reed head. Figure 6. Latching Relay Product Ⅳ Latching Relay Test 4.1 Measuring Contact Resistance Use the resistance profile of the universal meter to measure the resistance of the normally closed contact and the moving point, which should be 0. The contact resistance can be measured in a more accurate way within 100 milliohms, while the resistances of the normally-open contact and the moving point should infinite. From this, it can be distinguished which is a normally-closed contact or a normally-open contact.   4.2 Measuring Coil Resistance The resistance value of the relay coil can be measured with the universal meter R×10Ω, so as to judge whether there is an open circuit phenomenon in the coil.   4.3 Set Voltage and Current Get an adjustable regulated power supply and an ammeter, input the set voltage to the relay, and insert an ammeter in the power supply loop for monitoring. Slowly increase the power supply voltage, and when you hear the sound of the relay picking up, write down the set voltage and set current. In order to be accurate, you can try several times. Pay attention to, the setting current should be the average value, and the setting voltage should be the maximum value.   4.4 Reset Voltage and Current Repeat the above operation. But there is a little difference that the reset current is the average value, and the reset voltage is the maximum value.   Ⅴ Relay Selection 5.1 The Necessary Conditions ① The power supply voltage of the control circuit, the maximum current that can be provided.② The voltage and current in the controlled circuit.③ How many sets and types of contacts are needed for the controlled circuit. When selecting a relay, the power supply voltage of the general control circuit can be used as the basis for selection. The control circuit should be able to provide enough working current to the relay, otherwise the relay will be unstable when it is closed.   5.2 Relevant Information Search After consulting the relevant information to determine the conditions of use, you can search for the relevant information to find out the model and specification number of the required relay. If you already have a relay on hand, you can check whether it can be used based on the data. Finally, consider whether the size is appropriate.   5.3 Installation Layout Consideration If it is used for general electrical appliances, in addition to considering the volume of the case, it is necessary to consider the installation layout of the circuit board. For small electrical appliances, such as toys and remote control devices, ultra-small relay products should be used.   Ⅵ FAQ 1. What is magnetic latching?The design of a Magnetic Latching Relay is such that when a short pulse of electrical energy is applied to the solenoid coil, sufficient magnetic force is generated to over-come the force of the relay' return mechanism. 2. How does a latching relay work?One latching type has two opposing coils with an over-center spring or permanent magnet hold the contacts in position after the coil is de-energized. A pulse to one coil turns the relay on and a pulse to the opposite coil turns the relay off. 3. Where is latching relay used?This type of relay is most suitable in applications like ON/OFF devices from multiple places with push-button or momentary switch. For example, it is used in a lighting circuit or conveyer to control from different locations. 4. What is a magnetic latching relay used for?A magnetic latching relay is a device in which the solenoid principle is applied to open and close light-current electrical circuits. The same device applied in heavy-current circuits is called a contactor, or circuit breaker. 5. How does a latching relay reset?Resetting is very simple. The coil circuit needs to be opened and shortened to the coils ground potential. The capacitor will be discharged through the coil and drives a current pulse with opposite polarity through the coil.

Ⅰ Introduction RFID is a technology that uses electromagnetic fields to automatically recognize and track tags attached to objects. An RFID system is composed of a small radio transponder, a radio receiver, and a radio transmitter. Catalog Ⅰ Introduction Ⅱ RFID Related Video: Ⅲ RFID Chip 3.1 WHAT IS RFID? 3.2 HOW DOES RFID WORK? 3.3 What Are the Types of RFID Systems  ? Ⅳ RFID Tags 4.1 Definition of RFID Tags 4.2 How RFID Tags Work？ 4.3 Examples of RFID Tags Ⅴ What Does (RFID Reader) Mean? 5.1 What exactly is an RFID Reader  ? 5.2 Readers Types Ⅵ Blocking Wallet 6.1 What Is an RFID-Blocking Wallet? 6.2 How Do RFID-Blocking Wallets Work? 6.3 The 5 Best RFID-Blocking Wallets Ⅶ RFID Asset Tracking  7.1 What Is RFID Asset Tracking  ? 7.2 How Does RFID Asset Tracking  Work? Ⅷ RFID Vs. NFC: The 5 Key Differences Ⅸ FAQ   Ⅱ RFID Related Video:   How RFID Works? and How to Design RFID Chips?     RFID Related Video Description: In this video, we learn about how RFID works and we see how RFID chips are designed. The main concepts such as backscatter modulation and energy harvesting is explained in detail. We start by explaining the RFID technology, in particular passive RFIDs.We discuss the operation of RFID and the magnetic field coupling.Then we look inside the RFID tags and locate the RFID chip and antenna inside the tags.Then we see how RFID chips are designed and explain all different parts of the chip in detail.We discuss the backscatter modulation as well as RF frequencies used in RFID communication.At the end we also provide some information about RFID readers.     Ⅲ RFID Chip 3.1 WHAT IS RFID? RFID is an abbreviation for "radio-frequency identification," and it refers to a technology that uses radio waves to capture digital data encoded in RFID tags  or smart labels (defined below). RFID is similar to barcoding in the sense that data from a tag or label is captured by a device and stored in a database. RFID, on the other hand, has several advantages over systems that use barcode asset tracking software. The most notable difference is that RFID tag data can be read even when the tag is not in direct view, whereas barcodes must be aligned with an optical scanner. If you are thinking about implementing an RFID solution, contact the RFID experts at AB&R® (American Barcode and RFID).   3.2 HOW DOES RFID WORK? RFID systems are made up of three parts: a scanning antenna  , a transceiver, and a transponder. An RFID reader  or interrogator is a device that combines the scanning antenna  and the transceiver. RFID reader  s are classified into two types: fixed readers  and mobile readers  . RFID reader  s are network-connected devices that can be portable or fixed. It transmits signals that activate the tag via radio waves. When activated, the tag sends a wave back to the antenna.  which converts it into data. The RFID tag contains the transponder. RFID tag read range varies depending on factors such as tag type, reader type, RFID frequency, and interference in the surrounding environment or from other RFID tags  and readers,  Tags with a more powerful power source have a greater read range.   3.3 What Are the Types of RFID Systems  ? RFID systems are classified into three types: low frequency (LF), high frequency  (HF), and ultra-high frequency (UHF) (UHF). Microwave RFID technology is also available. Frequencies differ greatly depending on country and region. RFID systems with low frequency. These frequencies range from 30 kHz to 500 KHz, with 125 KHz being the most common.  LF RFID  has relatively short transmission ranges, ranging from a few inches to less than six feet. RFID system with high frequency  These range from 3 MHz to 30 MHz, with 13.56 MHz being the most common HF frequency. The typical range is from a few inches to several feet. RFID  UHF  systems These have a frequency range of 300 MHz to 960 MHz, with a typical frequency of 433 MHz, and can be read from a distance of 25 feet or more. RFID systems that use microwaves These operate at 2.45 Ghz and can be read from a distance of more than 30 feet.   Ⅳ RFID Tags 4.1 Definition of RFID Tags RFID tags are a type of tracking system that uses intelligent barcodes to identify items. RFID stands for "radio frequency identification," and RFID tags  make use of radiofrequency technology. These radio waves send data from the tag to a reader, which then sends the data to an RFID computer program. RFID tags  are commonly used to track merchandise, but they can also be used to track vehicles, pets, and even Alzheimer's patients. An RFID tag is also known as an RFID chip. 4.2 How RFID Tags Work？ An RFID tag transmits and receives data via an antenna  and a microchip, which is also known as an integrated circuit or IC. The RFID reader  's microchip is programmed with whatever information the user desires. What exactly is an RFID tag? RFID tags are classified into two types: battery-powered and passive. Battery-operated RFID tags.  as the name implies, use an onboard battery as a power source, whereas passive RFID tags  do not, instead of relying on electromagnetic energy transmitted from an RFID reader,  RFID tags  powered by batteries are also known as active RFID tags,  Passive RFID tags  transmit data at three different frequencies: 125–134 KHz, also known as Low Frequency (LF), 13.56 MHz, also known as High Frequency (HF) and  Near-Field Communication  (NFC), and 865–960 MHz, also known as Ultra High Frequency (UHF) (UHF). The range of the tag is affected by the frequency used. When a reader scans a passive RFID tag, it sends energy to the tag, which powers it up enough for the chip and antenna  to relay information back to the reader. The reader then sends this data to an RFID computer program for interpretation. Passive RFID tags  are classified into two types: inlays and hard tags. Inlays are typically thin and can be adhered to a variety of surfaces, whereas hard tags are, as the name implies, made of a hard, durable material such as plastic or metal.Transponders are much more battery-efficient than beacons because they only activate when they are close to a reader. Figure1:antenna 4.3 Examples of RFID Tags Because an active RFID is constantly transmitting a signal, it is an excellent choice for those seeking real-time trackings, such as in tolling and real-time vehicle tracking applications. They are a costly product, but they have a long read range, which may be preferred depending on the application. Passive RFID tags.  which cost around 20 cents each, are a much more cost-effective option than active  RFID tags ,  As a result, they are a popular choice for applications such as supply chain management, race tracking, file management, and access control. While a passive RFID tag does not require a direct line of sight to the RFID reader.  its read range is much shorter than that of an active RFID tag. They are small, lightweight, and have the potential to last a lifetime. Active RFID tags are better suited for applications requiring durability because they have a larger, more rugged design than passive RFID tags,  They are commonly used in toll payment transponder systems, cargo tracking applications, and even personal tracking devices. Figure2:Examples of RFID Tags Ⅴ What Does (RFID Reader) Mean? 5.1 What exactly is an RFID Reader  ? A radio frequency identification reader (RFID reader) is a device that collects data from RFID tags that are used to track individual objects. Data is transferred from the tag to a reader using radio waves. RFID is a technology that, in theory, is similar to bar codes. The RFID tag, on the other hand, does not have to be scanned directly, nor does it need to be in direct line of sight of a reader. To be read, the RFID tag must be within the range of an RFID reader.  which can range from 3 to 300 feet. RFID technology allows several items to be scanned quickly and allows for quick identification of a specific product, even when it is surrounded by several other items. RFID tags have not replaced bar codes due to their high cost and the requirement to individually identify each item.   5.2 Readers Types A passive reader in a Passive Reader Active Tag (PRAT) system only receives radio signals from active tags (battery operated, transmit only). A PRAT system reader's reception range can be adjusted from 1–2,000 feet (0–600 m), providing flexibility in applications such as asset protection and supervision.   An active reader in an Active Reader Passive Tag (ARPT) system transmits interrogator signals and receives authentication responses from passive tags. Active tags activated by an interrogator signal from the active reader are used in an Active Reader Active Tag (ARAT) system. A Battery-Assisted Passive (BAP) tag, which acts like a passive tag but has a small battery to power the tag's return reporting signal, could also be used in this system.Fixed readers  are configured to create a specific interrogation zone that is tightly controlled. This allows for a well-defined reading area when tags enter and exit the interrogation zone. Handheld mobile readers  are available, as well as those mounted on carts or vehicles.   Ⅵ Blocking Wallet If you have RFID-enabled cards, passports, or devices, an RFID-blocking wallet may be necessary to protect your data.   6.1 What Is an RFID-Blocking Wallet? Thieves can steal your credit card information just by standing next to you if you don't have an RFID-blocking wallet. It is possible if you carry a credit card with an RFID chip embedded in it. RFID credit cards allow you to make payments by simply touching the card to a scanner rather than swiping it across or inserting it into a terminal. They're made for ease of use. Imagine someone approaching you and "scanning" the wallet in your back pocket without your knowledge. They could theoretically copy the RFID data and create a clone of your credit card unless it is protected by an RFID-blocking wallet.   6.2 How Do RFID-Blocking Wallets Work? RFID chips have been a source of concern for many years, and not just in credit cards. RFID chips in all US passports issued after 2006 track your photo and information. RFID chips are embedded in metro cards for quick swiping, and RFID chips are implanted in dogs for tracking. RFID chips communicate by using radio waves. An RFID tag with information is embedded in the object, such as a credit card, and an RFID reader  uses radio waves to read the information from the tag. The key point is that RFID chips have tiny electromagnetic fields, which allows them to be read without having to "initiate" communications. The RFID reader  only needs to be close enough to the field to work. As a result, someone could theoretically scan a card through your pocket. And, yes, people have been scanned in the real world in this manner. Check out this Reddit anecdote to see what kind of headache RFID hackers can cause. Fortunately, radio waves can be easily interrupted and blocked, which is how an RFID-blocking wallet works. They encase your credit cards in a radio-interfering material. If the wallet is constructed properly as a Faraday cage, it will block all electromagnetic fields and prevent communication between your cards and RFID scanners. But do YOU really require an RFID-blocking wallet? Most likely not. If your credit cards do not have RFID chips, you obviously do not require one. Even if you do have RFID-enabled cards, the chances of being scanned maliciously are extremely low—-less than 1%, according to some. On the other hand, the possibility exists at all times, and the probability is non-zero.   6.3 The 5 Best RFID-Blocking Wallets Saddleback Passport WalletBig Skinny Slimline WalletTrayvax Original WalletSharkk Rugged WalletRadix One Black Steel   Ⅶ RFID Asset Tracking  As a company that depends on the availability of high-value assets to generate revenue, you understand the significance of asset tracking and effective inventory management. Whether it's inventory, tools, IT equipment, vehicles, or even employees. 7.1 What Is RFID Asset Tracking  ? RFID asset tracking is a technique for automating the management and location of physical assets. It works by loading data onto an RFID tag and attaching it to a relevant asset. This information can range from name, condition, amount, and location. An RFID reader  can capture the stored data by using the RFID tag's repeatedly pulsating radio waves. Eventually, it will be collected in a sophisticated asset tracking system, where the data can be monitored and acted upon. The ability to automate your tracking and monitoring processes seeks to eliminate the highly error-prone methods of pen-and-paper and excel spreadsheets.Among other benefits such as: Tracking multiple assets at any one timeEliminating human interventionCollecting data in real-timeImproving asset visibilityLocating lost or misplaced assetsMaximising accuracy of inventory   7.2 How Does RFID Asset Tracking  Work? The basic principles of how an RFID tracking system works are very similar whether it is used in agriculture to track livestock or in a warehouse to monitor a manufacturer's supply chain. First, you'll need the right tools: RFID Tags (Passive, Active, or Semi-Passive)An AntennaAn RFID ReaderA computer database equipped with Asset Tracking Software The RFID asset tracking process can be divided into four stages once the proper equipment is in place: The data is stored on an RFID tag that has a unique  Electronic Product Code  (EPC) and is attached to an asset. An antenna  detects a nearby RFID tag's signal. An RFID reader is wirelessly connected to the antenna  and receives the data stored on the RFID tag. The data is then transmitted by the RFID reader to an asset tracking database, where it is stored, evaluated, and acted upon. The initial process is relatively simple, depending on how you choose to deploy your RFID asset tracking system. However, there are a variety of factors to consider when selecting the right hardware.   Ⅷ RFID Vs. NFC: The 5 Key Differences Even though both technologies appear similar on the surface, there are five key differences between them. The Reading Range NFC technology operates on a limited range, also known as proximity. RFID, on the other hand, can read tags from up to 10 meters away, making it the best solution for vehicle identification and access. Check out our Automatic Vehicle Identification Guide if you want to learn more about long-term solutions. Communication Because NFC is capable of two-way communication, it can provide novel and complex solutions such as card emulation and peer-to-peer. Speed With NFC technology, unlike RFID tags.  only one tag can be read at a time. As a result, RFID tags are often better suited to environments with a high concentration of trackable components. Asset management in a manufacturing facility or tracking fast-moving vehicles is two examples. Data NFC technology stores and transmits a variety of data types. NFC devices, with their larger storage capacity, can store and transmit more data than RFID devices, which can only carry simple ID information. As a result, NFC is better suited to environments where payment details, membership, and ticket information, among other things, must be transferred. The cost-effectiveness NFC-based readers  are less expensive than long-range RFID solutions due to their limited reading range. As a result, NFC is an excellent choice for businesses on a tight budget who still require a high-quality solution. Ⅸ FAQ 1. Can you be tracked through RFID? The answer was an electronic lock, and the company has given its handful of employees the option of using an electronic key or getting an RFID chip implanted in their arm. "It can't be read, it can't be tracked, it doesn't have GPS," Darks said. 2. Can RFID be hacked? RFID hackers have demonstrated how easy it is to get hold of information within RFID chips. As some chips are rewritable, hackers can even delete or replace RFID information with their own data. ... It's easy to purchase the parts for the scanner, and once built, someone can scan RFID tags and get information out of them. 3. Why is RFID bad? The other problem with RFID chips versus, say, embedded smart chips is that as wireless devices they don't need to be near the reader to be read. Smart chips, on the other hand, need to be put next to, or into, a reader, so they aren't as susceptible to being sniffed in the open. 4. How is RFID powered? Active RFID tags have a transmitter and their own power source (typically a battery). ... Instead, they draw power from the reader, which sends out electromagnetic waves that induce a current in the tag's antenna. Semi-passive tags use a battery to run the chip's circuitry, but communicate by drawing power from the reader. 5. What is RFID example? For example, an RFID tag attached to an automobile during production can be used to track its progress through the assembly line, RFID-tagged pharmaceuticals can be tracked through warehouses, and implanting RFID microchips in livestock and pets enables positive identification of animals. 6. How do I know if I have an RFID chip? The best way to check for an implant would be to have an X-ray performed. RFID transponders have metal antennas that would show up in an X-ray. You could also look for a scar on the skin. Because the needle used to inject the transponder under the skin would be quite large, it would leave a small but noticeable scar. 7. Do credit cards have RFID? RFID-enabled credit cards - also called contactless credit cards or “tap to pay” cards - have tiny RFID chips inside of the card that allow the transmission of information. ... Though many new credit cards are RFID-enabled, not all of them are. On the other hand, all newly-issued credit cards come with an EMV chip.