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

Posted by filthyPhil 4 years ago  |  last reply 4 years ago

RFID Tracking?

Someone posted a question asking about RFID tracking and didnt get a good response. I also have not found a simple answer to my question on Google. So I figured I'd re-ask the question in hopes of a better solution. In short, friends and I go disc golfing pretty regularly and losing discs is always stressful (obviously we are not pro's so the occasional disc will go into the wood or tall grass etc). I thought wouldnt it be great to stick a tracking device on these discs to help find them. RFID's being small enough to just stick them on and not sacrifice too much in performance to the disc, i figured that would be the best way to go. Question here: Is there a practical way to track rfid tags? basically just a device capable of telling you when the signal is getting hotter or colder. Thanks, DJ

Posted by madzilla 8 years ago

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?

Asked by Kiteman 5 years ago  |  last reply 5 years ago

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

Asked by jainviaks8 6 years ago  |  last reply 6 years ago

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?

Posted by Atlasx111 6 weeks ago  |  last reply 4 weeks ago


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?

Posted by BryceK2 3 years ago  |  last reply 3 years ago

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.

Posted by Biribiri71 3 years ago

RFID Keyboard (Musical)

Hi there, I'm currently doing a University course in Digital Art and was wondering how possible it would be to produce an RFID keyboard (of the musical kind). In the lectures we've been studying about tags and readers which is all new to me, but I've been looking at a few different examples which use sound as their basis and was wondering if I could get something like a keyboard working. I've done a quick Google search and nothing has come up with regards to tutorials or anything related to producing something like this so I guess I'm the first to try it? I also looked on Ebay at parts and for an RFID reader and some tags it comes to around £10-15 which isn't too bad. For the keyboard part I was thinking of creating my own keys so that the instrument could be played with hands or feet as opposed to fingers (making it easier to play?). What do you guys think? Is it possible? Cheers, Andrew. P.S. Apologies for the lack of diagrams/pictures but this is just a quick thought and wanting to run it by someone before getting serious about it :).

Posted by kugarweb 8 years ago  |  last reply 8 years ago

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

Asked by JaredsProjects 9 years ago  |  last reply 9 years ago

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.

Posted by XyzzyYYZ 4 years ago

RFID Tags and Passports

Well, I'm finally getting a passport, due to the new law. Sadly, however, in time for the RFID law as well. I don't want to be carrying one of those around in the airport. Wired said you can disable it by smacking it with a hammer, but it stated that tampering w/ a Passport is against the law, so is doing that against the law? But anyway, I would preferably just want to put it in something isolating, like a lead bag or something. Faraday cages seem the best plan, however I don't know what I will constantly ground to. Hope someone can help :-)

Posted by zachninme 12 years ago  |  last reply 8 years ago

rfid chip in food

I have had some problems with illegal rfid chipping by the avalon station los angeles county sheriffs. i have had to throw away alot of my belongings not knowing which item or items were chipped. this rfid frequency number was given to a motorcycle gang on the mainland ( i live on santa catalina island off the coast of southern california).........and this gang attacked and tried to murder me across state lines when i went on a trip to northern california/oregon.............these guys stalked and attempted to kill me at least 15-20 times during an eight month terrifying ordeal!  there are some "bad cops" on the force that did not want me to return to the island; as i was going to be a major figure in some lawsuits that are being prepared at this moment. gang officer david v mertens played hardball with a very innocent little resort town of avalon (google his name). he tried to tell the world that on the "misty" island of catalina that there were gangs here on the island.....which is hogwash as everybody in this little community knows everybody else; sometimes too much.......it is like having 3000 brothers and sisters! so after his little pr stunt........hey; there is a need for him on the island. he got kicked off of the island as he does not belong in a resort town. i am a person who has lived in the wilderness for the better part of 30 years; and am very hard to locate, capture or worse...........but they tried twice on the island using air assets (one a grey unmarked military helicopter and two days later a little blue and white private airplane)....but to no avail. they came "straight to me" in the canyons and forests of the island and in the forests of oregon and then back again in the forests of lake tahoe...........no one has ever found me like that........especially a bunch of city boys. when they don't capture me we all walk around town as if nothing happened!  my questions are how to detect these chips and destroy them on my backpack, other belongings and even chips that may very well have been inserted into some food i found on the backside of the island just after a sheriffs helicopter had taken off from the remote area. i thought the chopper was putting food in places just in case some of the survivors of a coastguard airplane/helicopter crash found their way to shore; but it might of been meant for me. since returning to the island i saw someone chip my day pack that i left unattended during a mountain run............so as an experiment i went out three days ago and hid the pack  in the local hills,  when i returned home i realized that i had lost my knife out of it's holster.  i go back 30 minutes later to look...........and guess what?........the pack was already gone!  then some sort of personnel folks came back for me; that i saw way down below me in that spot......looking directly at me! i always get hunches to get up and go before anything major is about to happen; which is how i got away from the motorcycle gang and the sheriffs that backed the gang cop. any suggestions you might give me in regards to these issues would be greatly appreciated.  thank you for your time. pack below

Posted by richard e dial 9 years ago  |  last reply 8 years ago

How to create RFID antenna

Can you please guide me as how to create RFID Antenna and how it can be integrated with RFID reader ?

Posted by arumansoft 6 years ago  |  last reply 6 years ago

how do you disable an rfid?

Asked by georgejones6404 8 years ago  |  last reply 8 years ago

Zip car card RFID location?

I just got a Zipcar membership and received a card, which I assume has an rfid tag to unlock the doors. Does anyone know where the tag is, so I could punch a hole in it (to attach it to a keychain)? Or how I could find out? Thanks!

Asked by 10 years ago  |  last reply 9 years ago

How can I make a RFID locator for missing items?

Asked by 10 years ago  |  last reply 5 years ago

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

Asked by JekL 6 years ago  |  last reply 2 years ago

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

Kindly guide me for that which tools are needed?

Asked by naveedhussain 5 years ago  |  last reply 5 years ago

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.

Asked by THB.info 8 years ago  |  last reply 8 years ago

Challenge - RFID reader + Wifi Module Low Cost.

Hi Guys,I'm an Oracle Architect and I have one customer that want to monitor water dispenser, he wants to know if water bottle was changed. I have a software to control it, but actually the people need to input this data manually and I would like one solution to do it automatically. I'm thinking to use RFID Reader on water dispenser and paste passive tag on water bottle and with this I'll receive the information and this data must to be send using wifi, I can't have cable in this solution (data and power cable is not possible). In my investigation, I just find rfid reader (UHF) able read a passive tag in 1 meters distance, the issue is, the UHF module is very expensive, I saw UHF module for 40 USD and I need something more cheaper. Is there another way to do it? I need suggestions and help to developer it.If need more info, send me email.Regards, Haysar Lelis

Posted by HaysarL 1 year ago  |  last reply 1 year ago

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.

Asked by harryhaslam 6 years ago  |  last reply 6 years ago

TakeAWay Festival London

Takeaway Festival is a RFID workshop festival tailored for designers. It's located at the Dana Center in London. So if there are any London based instructable members, hit it up and let us know how it was!Do it Yourself Media ... I like that.-bg

Posted by lamedust 10 years ago

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.

Asked by nccwarp9 7 years ago  |  last reply 6 years ago

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!

Asked by Spoops 2 years ago  |  last reply 2 years ago

'ible req: RFID Ring

Topic says it all :)  No access to a 3D printer

Posted by Lycaon 4 years ago  |  last reply 4 years ago

rfid and arduin for barrier gate

I want to create a project using arduino barrier gate and RFID , as well as make use of the dc motor for driving the gate . please help me to complete this project , I have not been able to create a code arduino with RFID Thank you

Posted by AhmadA43 3 years ago  |  last reply 3 years ago

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!

Posted by davidandora 5 years ago  |  last reply 5 years ago

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? 

Posted by hthnc-student 6 years ago  |  last reply 6 years ago

Increasing the range of an RFID implant

So i was already planning on making both my cars keyless with RFID technology and possibly the house door to and i stumbled upon RFID implants. now they are pretty new to me but every thing i have seen on them, they are only able to be read at about 2 inches away.  With a good enough reciever could i increase that range to work better for my applicatiion?

Posted by ZACKHICKMAN501 8 years ago  |  last reply 8 years ago

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.

Asked by x0mb13z 9 years ago  |  last reply 9 years ago

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.

Asked by HiteshP16 2 years ago

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.

Posted by Estela Alano 5 years ago  |  last reply 5 years ago

what does RFID stand for? Answered

Asked by ironmanou812 8 years ago  |  last reply 8 years ago

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?

Asked by Etrogann 6 years ago  |  last reply 6 years ago

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.

Asked by Burf 7 years ago  |  last reply 7 years ago


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!?

Posted by benjaminleebates 3 years ago  |  last reply 3 years ago

Magnetic or rfid music box

Hi, i was wondering..is there any possibility to make something like this: you all know the sound mats for kids, where they step on it and it has a sound box in it and plays a sound..i was wondering if those mats can be modified like this: instead of playing sound when you step on it, it should play sound when you put an object over it ( magnetic or rfid). any idea if it works and how and what is needed? Thanks!

Posted by gabrielbuta 3 years ago  |  last reply 3 years ago

RFID LED Light Cubes

Hi! Long time follower of DIY projects. I had never considered actually trying any of the projects I had seen before, until I came upon the November 2011 issue  of Popular Science and saw the RFID LED Light Cubes. I think the idea is just So Cool and really want to try it as my first DIY project. Of course (ahh Irony, you cruel mistress!) that seems to be one of very few projects whose full instructions were never released. I'm pretty bummed out about this and even tweeted Vin Marshall (the OP) about it. He responded that he didn't think that there were any plans to release instructions for that project which is just extremely disappointing. I mean... someone Made it for the issue... how hard could it be to write up a set of instructions? I have the ingredients, but not the recipe, it's like asking me to make a souffle if all I know is that it has Eggs, Milk, Flour, Butter, and Cheese. If the idea of this DIY was to interest new amateurs in DIY projects, then they succeeded! Since November of last year, I've been trying to get some help making this awesome concept, but I just don't have the know-how. I'm begging you, Please help me figure this one out :( Help me make my first souffle. Here is a link to a 2 page PDF of the original PopSci article (and all the info I have on this project) https://www.dropbox.com/s/bds0pe73godn45m/RFID%20LED%20LIGHT%20CUBES.pdf Sincerely (and very hopefully!), Czarr

Posted by Czarr 6 years ago  |  last reply 6 years ago

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.

Asked by seedorfj 4 years ago  |  last reply 4 years ago

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

Asked by bismilla 2 years ago  |  last reply 2 years ago

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.

Asked by texner 8 years ago  |  last reply 3 years ago

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!?

Asked by newrev426 8 years ago  |  last reply 8 years ago


Somebody needs to figure out a way to use a usb and connect it to a arduino or a raspberry pi because I am TIRED OF HAVING TO PUT IN PASSWORDS OVER AND OVER AGAIN!!!        thanks, thomas

Posted by txkirrane 5 years ago  |  last reply 5 years ago

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.

Asked by Data643 8 years ago  |  last reply 8 years ago

Can I use an RFID reader and card to activate lights?

I was thinking of putting some string lights around the top edges of my room. Near the entrance, I want to wall mount an RFID reader in an enclosure so that when I wave the card in front of it, the lights would toggle on or off. I was also considering putting a second reader near my bed so that at night I could turn the lights off while sitting in bed. I would really like some help on how to do this because I don't have a clue on how to allow the reader to control the lights. Also, the lights will probably be ones that plug into a normal outlet, just in case anybody was wondering.

Asked by xlivewire7x 9 years ago  |  last reply 9 years ago

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.

Asked by Spaceman Spiff 9 years ago

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.

Asked by Jessecar96 8 years ago  |  last reply 8 years ago

can I make an RFID blocking wallet using aluminum foil instead of cans?

If aluminum cans can block RFID signals, how many layers of laminated aluminum foil (or, alternatively aluminum tape) would be needed to effectively shield a wallet?

Asked by Mr.Fancypants 9 years ago  |  last reply 3 years ago