RFID questions

I am wanting to create a fun RFID / NFC device that will detect when different people walk into a room. We all have individual RFID door tags to open a door so I was wondering what the range was on RFID, would the person need to tap their fob or is RFID strong enough to detect if somebody is just carrying the fob in their pocket? If the RFID isn't strong enough, could I use something in their phone to detect them? Bluetooth maybe? Everybody has an iPhone, could I detect something on that? Any thoughts? Thanks. Phil

Topic by filthyPhil   |  last reply


RFID antenna question. Answered

How sensitive is RFID functionality to the length of its antenna? Specifically, if I had an RFID like this one, cut the antenna and then resoldered it, would the loss in antenna length (I'm guessing about half an inch) affect the workings of the device?

Question by Kiteman   |  last reply


RFID Project Assistance

I am Software Engineer and need to build an prototype. Please can you recommend the hardware according the requirements specified below     I have an Arduino UNO starter Kit here, also have an Arduino DUE     The basics of the system are as follows:     * RFID scanner (with buzzer if available) and Tokens required.     * Display LCD/VFD/Serial, Need to have 16 characters x 2 lines.     * Also need an PUSH button to control when the RFID needs to Stop/Start Scan - If its embedded in RFID/Display, my job is easier. Regards, jainvikas8

Question by jainviaks8   |  last reply


Rfid Brain Chip

Is it safe to destroy a Rfid Chip in the Brain with an EMP device or would the Heat damage the Tissue too much?

Topic by Atlasx111   |  last reply


RFID READER HELP

Hello, can anyone help me design an RFID reader which can tell me when something is missing. I would like to build a reader for my file cabinet. I know this is hard but the reader will have to keep reading the files by maybe pinging and when a file is missing from the cabinet an LED will light up and maybe a small readout telling me what file is gone. Cabinet is small only 300mm so if anything is more than 300mm away from the reader it will light up. Can anyone help?

Topic by BryceK2   |  last reply


Arduino with RFID MFRC522

Hi, I need your help with Arduino and RFID MRC522. I need a program that reads the card blocks and stores them in an array, reads the UID of the card and saves it in a variable, then instead, the opposite direction, that is, write the card blocks with values ​​in an array and write to the UID of the card with a code contained in a variable .. I hope for your help because I'm desperate with a school project to be urgent, sorry, unfortunately I do not speak English and I had to rely on google translator.

Topic by Biribiri71 


Arduino and a RFID lock? Answered

I am trying to get the arduino to know when a certain RFID tag has been read.(so it can be used in a lock application) I tried taking the code array variable and seeing if it was equal to the the what showed up in the serial monitor window with the program on the arduino playground page.  But it came up with the error "exponent has no digits" .  So what would I have to use so that the arduino can interpret the "code" array and see if it is equal to a certain tag? I know that there are already door lock programs out there, but I like to know how programs work so I can learn from them and apply that to future projects. Thanks in Advance! AI

Question by JaredsProjects   |  last reply


RFID tag ideas

I've got a handful of RI-TRP-DR2B 32-mm Glass Transponders...Don't really know what to do with them so I figured I'd ask around here.  I've attached a picture and the data sheet for this item.  Has anyone worked with these or similar devices before?  Also, any recommendations for a reader/writer (preferably something that'd work with a Raspberry Pi or Arduino)?  They operate on 134.2 kHz. Thank you.

Topic by XyzzyYYZ 


RFID query: Programming RFID lock to accept "pre-existing" RFID chips?

I have no prior programming skills, and only a basic understanding of RFID technology. As my initiation to Arduino programming, I would like to build an RFID door lock/catch. I know you can buy RFID tags to program the system to accept, but can you also program the reader to accept other items you may have with an RFID chip? I'm not sure what other components might be in place to prevent that from functioning. Disney has RFID chip embedded bracelets, for instance which are used for a variety of things around the park.  They way I imagine the programming is that the reader reads an RFID and then records that ID to accept? Is there much more to that? Apologies for my ignorance at this point. Thanks to anyone for their clarification!

Topic by davidandora   |  last reply



How to emulate a RFID key, cheaply?

I've gotten into this nasty little habit of locking my keys in my apartment (twice this month). It costs me 20 bucks to get back in! We have a RFID key which costs 50 bucks to get a copy of!, There is no code on the back of it either. So, I figure, I'm mechanically inclined, I know how to solder, I can read electrical schematics, I understand diodes, caps, variable resistors, resistors, switches, leds, grounds...so on and so forth. I by no means understand it all. Anyways, I am rambling. How could I build a cheap (under 50) key emulator? Just to keep in the Jeep for when this happens again

Question by JekL   |  last reply



i want to make a project on RFID based library managment system?

Kindly guide me for that which tools are needed?

Question by naveedhussain   |  last reply


Is it possible to add a low current LED to a passive RFID tag? Answered

The idea is to get the tag to light up when it gets within range of the reader.

Question by THB.info   |  last reply


Will RFID work on a Key fob (Tesco sized Key fob) ? 53mm x 30mm.

Just want to know if it possible with it being small at 53mm x 30mm. Many thanks, Harry.

Question by harryhaslam   |  last reply



Lowest power required to light up an element, be it LED of light bulb or Neon?

What  component (led, bulb, neon...) needs the absolute minimum of energy to light up even dimly ? What I would like to do is to make something like RFID (no batt) that would be able so sense RF field from some distance, 2-3m. Thank you.

Question by nccwarp9   |  last reply


Do RFIDs constantly track?

I'm wanting to buy some RFID tags for a project that I'm doing, and I'm wondering if passive RFID tags that are activated constantly track and  send their location to the RFID receiver.  This is absolutely critical to my project.If these don't, what can I use that does the desired function?  Thank you so much!

Question by Spoops   |  last reply


Need help connecting a servo and RFID reader to arduino

I need help connecting a servo and RFID reader to an arduino so that the servo turns when the reader is activated. Are there any instructions or tutorials that anyone can provide? 

Topic by hthnc-student   |  last reply



Beat an RFID reader/lock?

Wondering if anyone knows a way to bead an RFID lock reader, like the ones found on many security doors at schools and stores. I thought maybe there would be a way to make a RFID from a credit card, DVD case, etc. into one which could be used to unlock these security locks.

Question by x0mb13z   |  last reply


Will mylar block RFID signals? Answered

I have an idea for a small leather work project that would utilize mylar film as an RFID signal blocker.  I have tried to research the effectiveness of mylar film for this purpose and the consensus opinion seems to be a resounding "Yes, No and Maybe." If anyone can point me to an authoritative source or has personal information relating to this, I would be most appreciative. Thanks Addendum: Much as I anticipated, you have posted a host of excellent answers that gave me a lot of information I hadn't yet considered. For my part, I should have included more information concerning my project in my question. The Skinnerz response reminded me that I have some scraps of fine mesh stainless steel screen termite shield and I will give that a try rather than mylar for my wallet and passport case.

Question by Burf   |  last reply


Any good tutorials for exploring and using RFID?

I'm looking to make a simple counter and scannable via RFID. Can you do this with RFID? For example, say I press a switch 100 times I want to be able to scan that circuit and read that the switch has been activated 100 times.

Question by Spaceman Spiff 


Is it possible to read the RFID chips implanted into cats with a microcontroller for identification purposes? Answered

I would like to be able to identify my cats so that they can be fed according to their particular diet, and they are already implanted with RFID tags from the vet. I was hoping to use these tags instead of making my cat wear an extra RFID tag on their collar.

Question by texner   |  last reply


How To Build RFID walk Through Sensors (Stands)?

Hi All, I am planning to build an School Attendance System, RFID Walk Through Reader, So i need help from your end how can i built it (Step by Step Processs and Need of Material i need to use for it). My Planning: Need to built an RFID Walk Through Reader, means, suppose if a student ware an RFID Card in his neck and when he pass through from RFID Reader stand (it may be 3 meters distance between ID card and Reader) then automatically this RFID Stand will read the students information from his ID Card and send SMS to his Parents automatically. will you please send me Step by Step Process how to build it and what type of material i need and what type of Software i need to develop, etc...to my mail id: md.bismillakhan@gmail.com, i hope i can get my answer as soon as possible from your end. Thanks & Regards Bismillah khan

Question by bismilla   |  last reply


Help developing rfid scanner program for arduino?

I am developing a rfid scanner that will be embedded in a seat and will turn on things etc. I wrote the code to do it but for some reason when I swipe the tag over the parallax reader it does the designated task up to 4 times when it is required to only do it once per swipe. Please help me revise my code so it will only happen once per swipe. I am using: parallax reader running at 2400 baud Arduino Duemilanove 3 LEDs link to .pde file (change to .txt to read code in wordpad) http://www.multiupload.com/XZQWCQ7UW0 -Thanks! I would not ask for help but I have been looking for over a week and I am stuck!?

Question by newrev426   |  last reply


Unable to retrieve Rfid variable.

I am unable to retrieve string (RFID) from Arduino connected to Android app through Bluetooth . Arduino code #include #include #include #define SS_PIN 10 #define RST_PIN 9 char command; String string; MFRC522 rfid(SS_PIN, RST_PIN); // Instance of the class MFRC522::MIFARE_Key key; byte nuidPICC[3];// Init array that will store new NUID String RFID; void setup() {   Serial.begin(9600);   SPI.begin(); // Init SPI bus   rfid.PCD_Init(); // Init MFRC522 } void loop() {   if ( ! rfid.PICC_IsNewCardPresent())     return;   // Verify if the NUID has been readed   if ( ! rfid.PICC_ReadCardSerial())     return;        for (byte i = 0; i < 4; i++) {       nuidPICC[i] = rfid.uid.uidByte[i];       if(i==0)       {         RFID=String(nuidPICC[i],HEX);         //Serial.println(RFID);       }       else       {        String temp =String(nuidPICC[i],HEX);        RFID=String(RFID + temp);        }    }       //Serial.println("\n Rfid :-");    //Serial.println(RFID);      if (Serial.available() > 0)     {string = "";}         while(Serial.available() > 0)     {       command = ((byte)Serial.read());             if(command == ':')       {         break;       }             else       {         string += command;       }             delay(1);     }     if(string == "TO")     {        // ledOn();         //ledon = true;         //Serial.println(RFID);     }     rfid.PICC_HaltA();   // Stop encryption on PCD   rfid.PCD_StopCrypto1(); } Android Code rfid.setOnClickListener(new View.OnClickListener() {             @Override             public void onClick(View v) {                 readrfid();             }         });  --------------------------------------------------------------------------------------------     // This will be the Readfrom Rfid !     private void readrfid()     {         String tp;         if (btSocket!=null)         {             try             {                 btSocket.getOutputStream().write("TO".toString().getBytes());                 ins = btSocket.getInputStream();                     while(ins.available() > 0)                     {                         //Reading from serial input                         valor= Byte.toString((byte)ins.read());                     }                 //Displaying readed value                 Toast.makeText(getApplicationContext(), valor , Toast.LENGTH_SHORT).show();             }             catch (IOException e)             {                 msg("Error");             }         }     } Thank You.

Question by HiteshP16 


How Can I Read Data Off of an RFID reader?

I have an RFID reader and a mini - usb convertor for it. . I have the ID-12 reader and the usb board from SparkFun and need to know how I can read data off of the usb board on a PC. I have Hyper-Terminal, but when I plug in the reader to the usb port and open the program, it will not read any of my cards. The reader itself still beeps and blinks with a green led.

Question by Data643   |  last reply


Equipment tracking using RFID

Hello there. I have this project where i intend to track down equipments entering and leaving the room. My first problem is im a newbie to Arduino and i don't have any clue on where to start.  I've already installed the software but i dont know what to do. Anyone who can help me? Or can anyone give me the code on how my Arduino will connect to my RFID reader? THANKS A LOT. By the way, im using Aceduino - an Arduino clone here in the Philippines.

Topic by Estela Alano   |  last reply


RFID or Bluetooth detecting range?

I have a project in which I need a stationary device (A) to pair with/detect a mobile device (B) and only that device. Once detected/paired, I need device B to light up when pulled out of range from device A. I also need to be able to adjust this range in some manner. I was looking at RFID, but I am worried about interferance from other RFID tags. Not sure if bluetooth could even do what I want in the size that I need (no more than 2x2x.25 inches for either device.) ANyone have any suggestions?

Question by Etrogann   |  last reply


RFID BLOCKING, MADE SIMPLE

I have seen RFID wallets, sleeves, and cards.  I like the IDEA of RFID blocking cards that you sandwich your credit cards between. So, my question is thus... If I had two cards made of 21 gauge aluminum and placed them on in the last pocket on both sides of my wallet, would this block the RFID scanners?  If not, then what would it take? What just programming some RFID chips and put them in my wallet to eff with the scanners?  I know there are things like this in the market, but very over priced.  I have contacts in the RFID scanning and deployment world, so it would not be hard for my to get my hands on this stuff. What do you all think!?

Topic by benjaminleebates   |  last reply



RFID/NFC computer lock?

I am curious if any of you have an idea for something that could detect a bracelet from 5-10 feet and when it leaves, issue a sleep command to a computer.  I think it would be relatively easy to issue the command from an arduino, but I'm not very sure on which tags and readers to use for the right range.  The idea would be for the computer to automatically sleep/lock when you leave the room.  So what frequencies/types of tags and readers should I look into that will offer a decent range, that is close enough not to loose connection reaching across the desk or walking a few feet across the room, but won't work from a few rooms down the hall, and will interface well with an arduino.

Question by seedorfj   |  last reply


Parallax RFID reader Door Lock Answered

I bought a parallax RFID reader from Radio Shack and was wondering how I could turn it into a door lock?  I don't have an Arduino or an interface to connect it to the computer.  I have some code from their site but i don't know how to put it on.  Tell me what I need and what I need to do.

Question by Jessecar96   |  last reply


how to protect mobile phones using rfid tags?

We have plenty of mobile phones used inside our office for testing and those need to be traced if it stolen or hand carried by outsiders,is it possible to use rfid tags to track those phones in exit points using rfid readers

Question by    |  last reply


Can a can 13.56 mhz rfid reader read a 125khz tag ?

It's probably a stupid question but I'm hoping to find out

Question by gradof6b   |  last reply



How to make a miniture RFID Door Lock?

Hi guy's, First time poster here, Just wanting to know how hard it would be to make this (https://www.instructables.com/id/Arduino-RFID-Door-Lock/) as small as possible. Im a noob to programming so any help would be appreciated and or where to gat the parts would be great..Cheers.?

Question by joker8656   |  last reply


How to connect an RFID card with a database?

Hello. I have been able to successfully read data from my RFID card using the card reader but I cant seem to connect my RFID card with my database that I have created using Microsoft Access and Visual Studio 2010. I want to be able to use my card to read data from the database when i swipe it and also be able to store data back to the card in order to update the information on each card. Please how do i go about this? I am using an arduino uno board and an RDM 6300 RFID reader 125kHz.

Question by rasy09   |  last reply


Can I connect an rfid reader to my arduino mini pro vcc pin?

I have a 3.3v arduino mini pro, but I'll be supplying 5v to the raw pin to power it. Can I connect my 3.3v rfid reader to the vcc pin of the arduino to use the arduinos regulator or is this not possible?

Question by joshblease   |  last reply



Arduino pro micro RFID and servo

I've successfully implemented Door Unlock system described in this tutorial. At first I used Arduino Uno and RFID RC522 Reader and MG90S Micro servo. When I used Arduino Uno with Arduino Pro Micro for arduino ATmega32U4 5V/16MHz, the RFID reader stops wirking after pluging the servo. Since Arduino Pro Micro have only 5v output, I used resistors to downgrade 5v to 3v in order to poser the RFID reader. I used same output 'vcc' to select 5v for the servo and 3v converted to the reader. The problem is that each component woks perfectly independent each other, however, when I place them together they stop working.

Question by NasrE1   |  last reply


RFID - Metal blocking receiver issues?

Please can anyone advise? So we've built a prototype that detects when a bottle is opened And triggers a software response. We need to build the real thing next. The prototype: We've used a small passive UHF RFID tag mounted on the lid of the bottle, hidden under foil. When the bottle is opened this tag pops out and can be sensed. We have a long range RFID scanner that recognised the appearance of the tag and send the signal onwards. This currently works ok at a Distance of around two meters. Problems with the prototype: The action of revealing the tag is not very reliable. Currently we've just experimented with various pieces of tape and foil attached to the tag and bottle. We need to develop something reliable that could be applied to a couple of hundred bottles. The range is a bit shorter than we'd hoped as well - ideally we need the range to be over 5 meters. Our reader has the option of adding multiple aerials though which may help. And perhaps we could have a set of readers linked It's not necessary to use RFID if some other way of detecting when the bottle has been opened could be used instead. The reason we chose RFID is that the bottle doesn't need anything very large added to it. We are trying to sell these things after all. We really could do with someone who can help make this system more reliable Both by helping us with improving the mechanism for revealing the tag and increasing the RFID sensing range

Question by hanspan   |  last reply


HACK a Passive RFID Transponder/ tag

I use an Amtech transponder to access my neighborhood.  The signal strength is poor and the association isnt cooperating with me to have the system upgraded or to offer me a new style of transponder.  I opened one my my transponders and it appears to be a PASSIVE RFID device.   HOW CAN I MAKE A PASSIVE RFID TAG INTO AN ACTIVE TAG?  I.e. HOW can I add a battery and/or larger antenna.  ANY other suggestions that you can offer would be appreciated.  

Topic by mmrogge   |  last reply


Interfacing the arduino with the parallax RFID reader? Answered

I want to interface the parallax RFID reader with the arduino.  I have done some research and found some programs, but I can't quite understand what is going on it the programs.  Here is one that I found on the arduino playground: www.arduino.cc/playground/Learning/PRFID I couldn't paste the code, because when I did it just went on one line, but the program I looked is the first one. The questions I have are: char code[10] ---- what does the 10 mean? Also how does the program read each byte individually, and then combine them into the whole byte string for the rfid tag. I am just learning about using serial with the arduino so not much in the program made sense to me and the programs didn't say how they worked. Thanks in advance!

Question by JaredsProjects   |  last reply


How to make a RFID bracelet for a travel card (Oyster card)?

Im trying to make a bracelet which incorporates my London Oyster Card (RFID travel card) so i can just swipe my wrist and not faff about with wallets or pockets etc but I am having a few issues. The basic design is going to be simple and effective. I will have a length of regular guage wire around the wrist, secured by a single wire connector/ terminal block (see photo). It will prob be a earth wire, as it is a fancy colour. The RFID will be placed inside the plastic connector and hot glued end end to secure it and keep out the elements. The RFID's aeriel wire will be inside the earth wire heatshrink, it will be a loop of wire and can be as thick as it needs to be. I keep having problems though, I cant get the chip out of the card in one piece. I have been using nail varnish remover but with mixed results.   When/if I do get the RFID chip out of the card, i will need to solder a new aerial and I am unsure about the process. Does the length/gauge of wire matter for the function of the RFID? im thinking about its frequency. Will it need to be ceramic covered wire to avoid shorts? Has anyone put a contactless travel card into other things? Or has any experience dealing with this sort of area? I would very much appreciate any help or advice.

Question by Clodester   |  last reply


Some advice on an RFID idea i have?

Realistically, how difficult would it be to DIY a passive RFID system where the tag simply reacts by lighting a low power LED. Catch is, i would want it to have an effective range of at least 1m. Could i build the EM emitter myself, or would i have to buy a high power reader?

Question by R3born   |  last reply


Arduino: HELP: How to perform action if two rfid tag UIDs have been detected?

I'm using an rfid-rc522 and I want to print to the serial a string of text if two rfid tags have been read in a given time period. Essentially this: 1. First tag is read (print to serial: Tag 1 has been read) 2. Wait 2 seconds 3. Second tag is read (print to serial: Tag 2 has been read) 4. Print to serial: Tag 1 and Tag 2 has been read) 5. Bonus: Keep this state - and then when a button is pressed (print to serial: Tag 1 and Tag 2 are finished) I know how to read the UID and print to the serial if one is read. Thank you so much for your help, it's greatly appreciated. Here is my code so far: #include     // Core graphics library #include // Hardware-specific library #include #include // For the breakout, you can use any 2 or 3 pins // These pins will also work for the 1.8" TFT shield #define sclk 4  // SainSmart: SCL #define mosi 5  // SainSmart: SDA #define cs   6  // SainSmart: CS #define dc   7  // SainSmart: RS/DC #define rst  8  // SainSmart: RES Adafruit_ST7735 tft = Adafruit_ST7735(cs, dc, mosi, sclk, rst); #define SS_PIN 10 #define RST_PIN 9 MFRC522 mfrc522(SS_PIN, RST_PIN); float p = 3.1415926; void setup(void) {   Serial.begin(9600);   SPI.begin();   Serial.print("Starting cornhole leaderboard...");   mfrc522.PCD_Init(); // Init MFRC522 card   Serial.println("Scan PICC to see UID and type...");   // Use this initializer if you're using a 1.8" TFT   tft.initR(INITR_BLACKTAB);   // initialize a ST7735S chip, black tab   // Use this initializer (uncomment) if you're using a 1.44" TFT   //tft.initR(INITR_144GREENTAB);   // initialize a ST7735S chip, black tab   Serial.println("Initialized");   uint16_t time = millis();   tft.fillScreen(ST7735_BLACK);   time = millis() - time;   Serial.println(time, DEC);   // large block of text   tft.fillScreen(ST7735_BLACK); } void loop() {   // Look for new cards     if ( ! mfrc522.PICC_IsNewCardPresent()) {         return;     }     // Select one of the cards     if ( ! mfrc522.PICC_ReadCardSerial()) {         return;     }     if (mfrc522.uid.uidByte[0] == 0xA4 &&        mfrc522.uid.uidByte[1] == 0xB8 &&        mfrc522.uid.uidByte[2] == 0xB8 &&        mfrc522.uid.uidByte[3] == 0x96) {           Serial.println("Nate has checked in to the game.");           tft.fillScreen(ST7735_BLUE);           tft.setTextSize(2);           tft.setCursor(0, 0);           tft.setTextColor(ST7735_YELLOW);           tft.print("Nate ");           tft.setTextColor(ST7735_WHITE);           tft.println("has checked in ");           tft.setTextSize(2);           tft.println("to the game.");           delay(2000);           tft.fillScreen(ST7735_BLACK);     }     if (mfrc522.uid.uidByte[0] == 0x03 &&        mfrc522.uid.uidByte[1] == 0xFD &&        mfrc522.uid.uidByte[2] == 0xBC &&        mfrc522.uid.uidByte[3] == 0x02) {           Serial.println("Ted has checked in to the game.");           tft.fillScreen(ST7735_RED);           tft.setTextSize(2);           tft.setCursor(0, 0);           tft.setTextColor(ST7735_CYAN);           tft.print("Ted ");           tft.setTextColor(ST7735_WHITE);           tft.println("has checked in ");           tft.setTextSize(2);           tft.println("to the game.");           delay(2000);           tft.fillScreen(ST7735_BLACK);     } } Thank you!

Topic by djrage   |  last reply


Passive RF battery?

Hey i was just wondering what are typical conversion rates for signal to electricity in passive RFID tags? Information on the subject is usually not geared towards the electrical charge being generated.

Topic by Qcks   |  last reply


Keeping track of your ants...

This may well be the world's smallest tracking collar. From an article in Science News.

Topic by kelseymh   |  last reply