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Questions tagged [rfid]

Radio-Frequency Identification. Uses electromagnetic fields to transmit data for identification purposes, such as between a tag and a reader. RFID is the precursor to Near Field Communication (NFC).

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MFRC522 not scanning card

So I have an Arduino Uno and an MFRC-522 reader, using a breadboard I've wired it up according to the example sketch which is the mfrc522 DumpInfo sketch. /*Typical pin layout used: * * ...
Greeley's user avatar
  • 19
0 votes
1 answer
590 views

Convert ASCII output to human readable form and assign to a variable [duplicate]

I'm reading the RFID output and I can print it to the serial monitor as human readable. But what I want is to assign that to a variable. But I'm getting the ASCII. Is there any way to convert it and ...
Vimukthi Saranga's user avatar
2 votes
1 answer
680 views

RFID reader for unknown tag 125kHz

I have an unknown RFID tag and tried to read its value. I bought two readers, RDM6300 125KHZ and RC522 13.56MHz. Each of the readers connected to Arduino works well with the purchased corresponding ...
Jan Jarčík's user avatar
0 votes
3 answers
2k views

How to send arduino data to php code

I'm new to arduino. I'm doing a project where I need to send a RFID UID to php code. The UID will be detected by the arduino and the rest will happen at the php side. for that I need to get this UID ...
Vimukthi Saranga's user avatar
2 votes
1 answer
2k views

Aptotec PN532 shield power consumption

I am currently planning a battery-powered project, where one of the tasks involves reading Desfire EV1 tags. Since the cheap RC522 based NFC shields are reported not to work with the Desfire EV1 tags, ...
jarnbjo's user avatar
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0 votes
2 answers
587 views

RFID Reader ID12-LA reads every card as ÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿ

My new RFID reader ID12-LA by SparkFun can recognise an RFID tag, but it can't read its tag number - the Arduino IDE outputs the tag as ÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿ Any help on how to convert this into a proper ...
ixRx's user avatar
  • 71
3 votes
1 answer
3k views

RFID-RC522 Can't access sector after writing to trailer block

I'm currently using an Arduino Uno R3 and an RFID-RC522 with https://github.com/miguelbalboa/rfid . I wrote the following bytes to the trailer block in order to experiment with it: byte ...
Metonymy's user avatar
2 votes
3 answers
459 views

RFID stops working when I place the 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 ...
Nasreddine's user avatar
0 votes
1 answer
748 views

MQTT Callback function don't called

I'm doing a device to recongnize NFC cards with an Arduino UNO, a CC3000 wifi shield, and a PN532 NFC shield. That's ok. So, I created a sketch with this library: https://github.com/nathanchantrell/...
Douglas Lima Dantas's user avatar
0 votes
1 answer
946 views

NFC 'dynamic' UID database

Hi SE (and Majenko in particular, if I'm lucky) - I have a setup with an SD module (on SPI) and an Elechouse PN532 NFC reader (on I2C). I would like to use a master tag to enter MASTER MODE [sic] to ...
user400344's user avatar
0 votes
1 answer
164 views

do i need to also connect GND and 3.3v

I am trying to run this code: https://github.com/miguelbalboa/rfid/blob/master/examples/ReadNUID/ReadNUID.ino Using an ESP8266 based D1 board and an RFID-RC522. I am not able to get it to detect the ...
epeleg's user avatar
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0 votes
1 answer
5k views

Changing Uid Using MFRC522 Via Arduino Error

Well, I' ve just bought and recieved a MFRC522 rfıd module and done to much research on it. After watching several videos, I sorted out a library for using this module via arduino. You can click the ...
Konko's user avatar
  • 25
0 votes
1 answer
2k views

RC522 RFID reader doesn't read NTAG216 chip

I have an RFID-RC522 module based on the MFRC522 chip. This chip is described in the datasheet as supporting "ISO/IEC 14443 A/MIFARE and NTAG" protocols. I have wired it up to an Arduino Uno using the ...
Jules's user avatar
  • 109
2 votes
1 answer
628 views

RFID RF522 kit for access control

I am trying the RFID RC522 reader kit with an Arduino UNO to built a controlled access system for a door. Using the code below, I am able to read the UID of my card and light up an LED when the ...
Octopus8's user avatar
2 votes
0 answers
284 views

Cannot read NTAG203 with MFRC522

I tried regular RFID tags and It works but when I tried NTAG203 it won't detect. P.S. I used the code "dump_data" example of MFRC library.
AH.'s user avatar
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1 vote
1 answer
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MFRC522 Module Won't Read Multiple PICCs Consecutively

I recently bought an MFRC522 RFID module to use with my Arduino Uno, which came as a kit with a couple of MiFare 1K cards. The issue I've been having is that, I cannot scan cards consecutively (the ...
fpackard's user avatar
  • 111
1 vote
1 answer
820 views

Why doesn't my 1602A LCD display text with this code?

#include <SPI.h> #include <MFRC522.h> #include <LiquidCrystal.h> #include <Servo.h> #define RST_PIN 9 // Configurable, see typical pin layout above #define SS_PIN 10 // ...
davester14's user avatar
4 votes
1 answer
1k views

RFID/NFC Tag get data from wordpress MySQL

I have a local workshop for students to teach them 3D printing/woodworking I want to know if its possible to create RFID/NFC tags using wordpress data from MySQL or HTTP/HTTPS. Web Scenario : I have a ...
Barbu Daniel's user avatar
2 votes
2 answers
406 views

How to monitor a sensor for specific period

As noted in earlier posts, I am building a model railroad crossing gate signal, complete with gate arms, flashers and sound. Although I haven't settled on exactly how I am going to implement detection ...
dinotom's user avatar
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4 votes
0 answers
646 views

RFID Code (and setup) works on an UNO but not on the Yun

We're using two RDM6300 RFID readers for this, and the code works when plugged into an UNO, but not when connected to the Yun. We have one of the rfids plugged into the rx pin (0 on the digital side) ...
soulkingbrook's user avatar
4 votes
2 answers
1k views

How can I get ultra clean dc wall power for my arduino project?

I'm doing an rfid project that requires a read range of at least 5 inches or about 13cm. I'm using a nano with a usb port, a rfid reader from priority 1 design and a large antenna. The problem I'm ...
badweasel's user avatar
  • 155
0 votes
1 answer
2k views

Defining an NFC tag as NDEF using the Arduino Uno and the PN532 NFC module

I bought a bunch of blank Mifare Classic NFC cards and I'd like to write NDEF records to them using my Arduino Uno. When I read them using my Uno and a PN532 NFC module using Don's NDEF library ...
Joris's user avatar
  • 163
1 vote
1 answer
8k views

Extracting a substring from original string

I am trying to extract a substring out of another string, but it doesn't seem to be working. I am new to programming in arduino and c++ in general. Here is my code: void setup() { Serial.begin(...
y4my4m's user avatar
  • 19
4 votes
0 answers
3k views

Can we use an alternate RFID reader to read HID cards?

I'm working on a project where I need to read the HID RFID cards. Behind the card it shows as HID 0008p and based on the documentation, it looks like it uses a 125 kHz frequency. I tried using ...
Ram S's user avatar
  • 51
1 vote
1 answer
4k views

RFID detects the first card fine, but hangs on a second

I am writing a program that: Reads string (one line) from com port Waits for an RFID card to be present Reads a block from the card Here's the code (it uses this MFRC522 library, also the code is ...
rfg's user avatar
  • 115
0 votes
2 answers
4k views

Detect when RFID card is absent

I am trying to build a mobile device that turns itself on when removed from its usual location. I am attempting to do this with an Adafruit PN532 RFID reader and a MiFare card. Using the sample code I ...
techkilljoy's user avatar
2 votes
1 answer
2k views

Read ISO/IEC 14443B (NFC Type B) with PN532

I bought a PN532 from Elechouse (documentation here) because I need to read IDs from Type B NFC cards. My problem is that even if they say the hardware supports Type B, the official libraries an ...
rAthus's user avatar
  • 121
0 votes
2 answers
713 views

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 ...
N S 's user avatar
  • 1
4 votes
3 answers
7k views

MFRC522 Only working sometimes

/* * -------------------------------------------------------------------------------------------------------------------- * Example sketch/program showing how to read data from a PICC to serial. * -...
Devon Freeland's user avatar
2 votes
1 answer
8k views

How to emulate an RFID tag with the RC522

Is it possible to emulate an RFID tag with the RC522? (Spec sheet: nxp MFRC522.pdf) I want the RC522 to act like a NTAG213 nxp.com/documents/data_sheet/NTAG213_215_216.pdf and to be read/write by ...
pythonimus's user avatar
0 votes
1 answer
1k views

Read RFID Card Number in Processing over Serial

I have successfully setup up a RFID reader with Arduino Uno and EM-18 Card Reader Module. Its program for Arduino is below: int count = 0; // count = 0 char input[12]; ...
CrownedEagle's user avatar
0 votes
1 answer
3k views

HID multiCLASS RFID reader all Mifare to Wiegand 32bit

I'm using an Arduino Uno to read from a "HID multiCLASS (RP40CKPNN) reader", which is a stand-alone reader that reads cards and returns a number of bits via Weigand Data0/Data1 protocol. The "...
ZacWolf's user avatar
  • 212
2 votes
0 answers
914 views

Help reading a 125khz FSK RFID

Reddit doesn't seem to be much help, so I'm posting here as well. I'm try to read (what I think is) an HID Duoprox II 125kHz FSK RFID and am having a bit of trouble. I'm using an Arduino nano and am ...
user1637451's user avatar
0 votes
1 answer
267 views

RFID tag "location identification"

Can an RFID tag be used to identify a room? For example, I walk into a room, and the RFID receiver tells me that I am in say, the living room. Would it be possible for a tag to ping back the signal ...
Sujoy Purkayastha's user avatar
6 votes
3 answers
15k views

Issue sharing MISO with multiple RC522 RFID Readers

so for about the last 8.5 hours (almost non-stop) I have been trying to figure out one issue and I have exhausted every search I could possibly think of. I'm building a puzzle that requires 5 RFID ...
Jesse Mount's user avatar
2 votes
1 answer
1k views

Emulate RFID Tag [closed]

I just got my RFID-RC522 Reader and was wondering one thing. Can i Use an RFID Reader to emulate an RFID Tag, so that if i have another reader it will detect the other one as a card and transfer data. ...
DVSProductions's user avatar
3 votes
0 answers
1k views

Using Johnny-five API with RFID Controller Shield

Is it possible to use the Adafruit PN532 NFC/RFID Controller Shield with the Johnny Five API? I've searched the depths of google and I'm unable to find anything so far. If it is possible, how can I go ...
Chris Till's user avatar
3 votes
2 answers
2k views

How to read an RFID reader?

I want to connect an RFID reader to an Arduino board. The RFID reader has several wires attached, and the manual mentions them as follows: Red: VCC +12V Black: GND Green: D 0/RX/4R+ White: D 1/TX/4R− ...
MC Emperor's user avatar
0 votes
3 answers
1k views

Memory organisation of MIFARE 1K

I'm trying to use a MIFARE 1K RFID card with RC522 RFID reader/writer for my college project. I'm trying to understand about memory organization of MIFARE 1K.A documentation() that supplied with a ...
user_fs10's user avatar
  • 187
1 vote
2 answers
24k views

how to detect 125khz tags with mfrc 522

I have just ordered MFRC 522 RFID reader from amzon, and I have also orders 5 RFID tags with keychains and a arduino uno board for my project, I have received RFID reader and tags and I have tested ...
vedang_joshi's user avatar
1 vote
1 answer
373 views

Reading RFID tags with Arduino IDE, not using Arduino

I am completely new to this technology, but I'm hoping to build a fairly simple program through the Arduino IDE that takes the serial numbers of RFID cards read through my ID-20LA Innovations RFID ...
Lauren F's user avatar
  • 113
-1 votes
1 answer
415 views

RDM630 RFID Reader on Beaglebone Black? [closed]

I have an RFID reader RDM-630 with these specifications: http://www.seeedstudio.com/depot/datasheet/RDM630-Spec..pdf Could I connect this to a Beaglebone Black?
holografix's user avatar
-2 votes
2 answers
174 views

I have an 'error' with my code

The following code gives me an error: // RFIDunio.h is from http://learn.robotgeek.com/getting-started-guides/39-robot-kits/151-rfiduino.html #include <RFIDuino.h> byte keyTag[5] = {0,0,0,...
I an Oxy Moron's user avatar
1 vote
3 answers
12k views

rfid_default_keys check with RC522

I just received a RC522 board and since i am new to RFID, I tried out some examples from "Arduino RFID Library for MFRC522". Here's one of them rfid_default_keys /* * -------------------------------...
Grafitter's user avatar
2 votes
1 answer
2k views

Smart Chess-board (possibly using RFIDs?)

I'd like to make a chess-board with the ability to detect the position of each piece. The solution that occurs to me would be to put an RFID reader under each square and put RFID tags on the bottoms ...
interstar's user avatar
  • 129
0 votes
2 answers
2k views

How to add data without pre-defining variables?

I am currently working on a RFID card reader. I need the reader to send the ID to a storage space. What I am trying to achieve is a person swipes their card, enters their name on the serial monitor, ...
TL140's user avatar
  • 55
2 votes
0 answers
1k views

Arduino code issue (using Bluetooth and Rfid technology)

I am building a device that communicates with my Android phone. I know that my App works but my Arduino code seems to have a problem. So I have made a smaller programm and everything works fine there. ...
Robin's user avatar
  • 133
3 votes
2 answers
471 views

How to avoid pulling the RX0 pin to reset sketch

My project requires reading 5 serial devices (RFID readers) at the same time. I chose an Arduino Mega 2560 as it comes with 4 serial RX ports. For the fifth port I am using the SoftwareSerial library. ...
aaronfarr's user avatar
  • 133
1 vote
1 answer
25k views

How to write RFID data using the RFID-RC522 chip

I have got this library+code example from a friend, to read RFID numbers using the RFID-RC522 chip: RFID.ino #include <RFID.h> #include <SPI.h> /** * RFID pins * MOSI: Pin 11 / ICSP-4 * ...
Rumanoid's user avatar
0 votes
1 answer
4k views

How to send the MFRC522 RFID module into sleep mode?

I'm trying to get the power consumption of a MFRC522 RFID module down, currently while running it consumes about 4mA. There should be a way to put it into sleep mode, I just can't find any ...
Sam W's user avatar
  • 199