Skip to main content
Share Your Experience: Take the 2024 Developer Survey

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).

Filter by
Sorted by
Tagged with
-1 votes
0 answers
9 views

rc522 'PCD_Authenticate() failed: Timeout in communication.' with any card

I hooked up an RC522 module to my esp32, and uploaded the dumpinfo code to test if it works without modifying anything, just changed the rst and ss pin, and it detects the module, but any card, even ...
Your_missing_bracket's user avatar
1 vote
0 answers
84 views

Issue with multiple RC522s connected to Arduino Uno

THIS IS NOT A DUPLICATE QUESTION. My main problem is that whenever I attach the third RC522, the whole system becomes unstable. When I attach the fourth, suddenly one or two of the modules stop ...
Arman Asgharpoor's user avatar
0 votes
0 answers
262 views

Arduino Uno RFID-RC522 won't scan any card or tag

So I bought a RFID-RC522 module with a blue tag and a white card, and I searched for tutorials and found this library that I used it. and here is my code : #include <MFRC522.h> #include <SPI....
Mr Code Gamer's user avatar
1 vote
1 answer
389 views

RFID card read loop seems to stop

I successfully programmed an RFID card reader to switch lights on and off if any rfid card is presented. I have tested this and it works, with the lights continually switching on and off if any rfid ...
Christine's user avatar
2 votes
1 answer
602 views

Reading/writing Ntag215 with RC522

I ordered Ntag215 from Aliexpress. The tags are identified just fine, yet I have issues writing/reading to them because of failed authentication. I am using Arduino Uno + RFID-RC522 module. This is my ...
void_hello_world's user avatar
1 vote
0 answers
184 views

Using RDM6300 and RC522 at once

I want to use both RDM6300 and RC522 at a single .ino code at once. But whenever I try them both, only one of them works. How to get the both working? [Dev envt. ESP32 Dev module] // LIBRARY ADDITION ...
Lakmina Gamage's user avatar
1 vote
1 answer
177 views

Using MFRC522 along with other inputs (Bluetooth, keypad)

I'm making a little parking lot, which includes mostly opening a servo motor using either keypad, Bluetooth (hc-05) and freshly added, RFID (RC522). I can't get inputs from other sources if I want to ...
Barzy's user avatar
  • 19
0 votes
1 answer
212 views

Cannot compile MFRC522 minimal I2C example

On ESP32 I'm trying to build the Minimal I2C example of the MFRC522 library: But I get errors on the first declarations: TwoWire i2cBus = TwoWire(0); MFRC522_I2C dev = MFRC522_I2C(RST_PIN, 0x28, ...
Mark's user avatar
  • 393
2 votes
1 answer
368 views

MFRC522 board not detected. Red LED lighting

Mega 2560. I can't get the RFID board detected. The code is as below, and outputs Didn't find MFRC522 board.. I also tested some other library and test code with success. I triple checked the wires (3,...
James_T's user avatar
  • 21
0 votes
1 answer
158 views

Wired Teensy 3.5 AudioShield and RFID RC-522

I received a set of wired Teensy 3.5 AudioShield and RFID RC-522. The audio shield is mounted on the Teensy but I cannot connect the MFRC522 Using MFR222 library. Pins are set to 0 and 31: #define ...
judthedude's user avatar
1 vote
0 answers
121 views

I am trying to use Arduino Uno as a hid device to login Windows but I cannot use Modifier keys to Lock Windows

uint8_t buf[8] = { 0 }; #include <SPI.h> #include <MFRC522.h> // RFID library #define SS_PIN 10 //RX slave select #define RST_PIN 9 int gled = 7; // optional int rled = 4;// optional ...
Abhi Electronics's user avatar
1 vote
0 answers
282 views

Rfid Mfrc522 not working using long cable

I am doing a project using Arduino and a Rfid Mfrc522 module that consists of reading a card to unlock/lock a door. The Arduino is 3 meters far away from the Rfid Mfrc522 module and I used 7 cables to ...
Enzo's user avatar
  • 11
1 vote
0 answers
64 views

Rfid checking continuously for cards

Well I am making a automatic car parking system where a any one parking their car will get a card as a token and have to return it before leaving with their cars one card for a slot And if they don't ...
Abinash mohanty's user avatar
1 vote
0 answers
443 views

rfid module not working (rc522)

i brought a rfid module which is rc 522 but when i upload the code it is not reading the card even when i upload example code i have returned it 2 times and got it replaced but the same problem may i ...
Rathore Brothers's user avatar
2 votes
1 answer
81 views

NFC hang after RF_ON command

We have developed our board with PN5180 NFC but I cannot make it work properly. After I send RF_ON command I am stuck on STATE_CHANGE_IRQ_STAT while waiting for TX_RFON_IRQ_STAT but the state never ...
user31496's user avatar
1 vote
1 answer
4k views

My PN532 doesn't detect RFID card when connected with ESP32 in I2C mode while it works perectly with Arduino Uno

I have a Elechouse PN532 module (bought here - https://robu.in/product/pn532-nfc-rfid-read-write-module-v3-kit/). When I try to use to it with I2C and connect it to my ESP32 (DOIT ESP32 DEV KIT V1, 30 ...
Gagan G's user avatar
  • 11
1 vote
0 answers
925 views

Trouble interfacing PN5180 RFID Module with Arduino Uno

I bought the PN5180 module a few weeks back and I am having quite a bit of trouble interfacing it with my Arduino Uno. The library that I am using is ATrappmann PN5180 Library. The link of which is ...
Khuzaim Khan's user avatar
1 vote
1 answer
838 views

Store Integer Value of Money on an RFID Tag

I am working on making an Arduino based arcade. I want each user of the arcade to have an RFID card that stores the amount of credits (basically money) they have. I know that RFID tags have 1028 bytes ...
Rowan McAlpin's user avatar
2 votes
0 answers
335 views

Using ICSP pins as SPI in Arduino Due

I am using two RFID sensors operating on SPI with arduino Due. They will not be operating at the same time. Is it favorable to use the ICSP pins as SPI pins for one of them, or use them in a one ...
sarah 's user avatar
  • 121
1 vote
0 answers
745 views

How to combine Read/Write Data Code for RFID tag?

I have the two example codes from MFRC522 Library and I want to combine them together so I can at first read the data from the tag and then write something new on it by using the serial input. I´ve ...
Bau3r Hermann's user avatar
0 votes
1 answer
2k views

How to send int array with ESP8266 http post request?

I'm reading RFID cards' UID with an ESP8266 and trying to send that information to my web server hosted on a Raspberry Pi. I'm currently storing the UID in an int array, but the http.POST(); function ...
leventecsoba's user avatar
2 votes
0 answers
293 views

RFID and Keypad Based Door Lock Using Arduino [closed]

I'm new to the Arduino world and I have a question. I found this project to do but I need your help, I want instead of this servomotor to put an electromagnetic door lock, could you help me with the ...
Alex's user avatar
  • 21
3 votes
3 answers
891 views

Request for help condensing code and saving memory

I'm building a final project for a class that involves playing an audio file of a wave shield every time I scan an amiibo with an RFID scanner. I'm a pretty new programmer, so I'm not very familiar ...
Ethan Braun's user avatar
1 vote
0 answers
108 views

How can I get an integer from an RFID tag from Arduino Mega to NodeMCU 1.0 over serial communication?

I want the number from an RFID tag read by a reader connected to an Arduino Mega to end up as a string on a NodeMCU connected to the Mega. I am trying to confirm that the string is on the NodeMCU ...
Jonathan Talbot's user avatar
1 vote
1 answer
682 views

lcd byte array display

when reading RFID(MIFARE) information using Arduino mega and display in serial monitor it works fine. But, when printing on 2004LCD only one information(Value) displays correctly. The other ...
Ak Rikas's user avatar
1 vote
0 answers
241 views

EM-18 RFID module not reading Card ID

I am using EM-18 Rfid module with Arduino mega the problem is that when i swipe the card for reading the card ID nothing will shown in serial monitor.Code given below.EM-18 connection diagram is given ...
Moin's user avatar
  • 11
1 vote
0 answers
554 views

I'm desperate and need help with MFRC522 (stops working randomly)

I've made a light switcher that switches lights on for 15s after a correct tag is presented, and also when door is opened for 6 seconds (its for outside) so i can see a keyhole after leaving for a ...
user14972314's user avatar
1 vote
1 answer
2k views

MFRC522 Communication Failure

I'm using TTGO ESP32 and I've got an MFRC522 from AliExpress. I've soldered connector pins to the board itself (both for ESP32 and MFRC522) and I'm using jumper wires female-to-female to connect ...
The VaLo's user avatar
-1 votes
1 answer
68 views

arduino parking lot

I want to make a project where there is a parking lot and a ir sensor which senses when a car comes and displays a message on lcd saying to insert a rfid card and then it opens a gate and there are ...
rohithrathod banoth's user avatar
5 votes
0 answers
339 views

SPI between Master arduino and Slave arduino

How can I send the string from Slave SPI to Master SPI? I want to write code in Bare Metal. The problem which I am facing is I can't make out what will be my blocking function in Master SPI code when ...
Kunal's user avatar
  • 81
1 vote
0 answers
323 views

NodeMCU unable to communicate with MFRC522 RFID reader even though the nodeMCU is successfully connected to a mobile hotspot

I am replicating a project that will read the RFID card or tag data, store that into a mysql database and display the data via PHP. I am using NodeMCU, RC522 RFID reader and Ardunio IDE to do that. ...
Wayne 254's user avatar
1 vote
0 answers
93 views

How to connect arduino mega 2650 and motor driver shield with seperate powers source?

I am building a robot that runs only when a matching rfid tag is identified..for that i need motor driver shield for running the motors and rfid module. The problem is if i attach the motor driver ...
Arjun's user avatar
  • 11
0 votes
1 answer
65 views

i need help my coding for my fyp

how my coding works = 1 rfid card detect on first rfid reader and 2 rfid card detect on second rfid reader after that servo go to 90 my second rfid not detect this is my coding #include <SPI.h> #...
 AMEIR ADZNIL 's user avatar
1 vote
1 answer
71 views

How can i make my MLX90614ESF scan temperature after the MFRC522 scans the RFID tag? [closed]

//THIS IS THE RFID CODE #include <SPI.h> #include <MFRC522.h> #define RST_PIN 9 // Configurable, see typical pin layout above #define SS_PIN 10 // ...
Ace Canacan's user avatar
1 vote
0 answers
183 views

Multi MFRC522 Slave AND only mifare read

Multiple MFRC522 Connections (https://learn.sparkfun.com/tutorials/serial-peripheral-interface-spi) I only get from each slave with an ID card; I want to print a defined barcode on the slave address. ...
is_mail's user avatar
  • 21
-1 votes
1 answer
1k views

RDM6300 library not working on ESP8266

I have a RDM6300 RFID module which I am trying to connect to an ESP8266 by using rdm6300.h library. I had it all up an running all along with other components but we had connected to the ESP8266 but ...
user2128702's user avatar
1 vote
0 answers
67 views

i am working on rfid module and the module is not detecting sny of the cards

i am working on uno. i am using mfrc522. the module is not detecting aby of the cards. nothing is poping up on the screen. this is the code- #include <deprecated.h> #include <MFRC522.h> #...
Mohan Tanuj's user avatar
1 vote
0 answers
404 views

RFID-RC522 not working properly?

So I'm working with an arduino uno and I want to read the UID from one card and write it to another with the code of Miguel Balboa but the RC522 doesn't appear to read anything on the serial monitor. ...
user avatar
1 vote
0 answers
25 views

Issue with different ways of powering

I have a project to make where I have to read tags out of 5 RFID Readers and when every tag is in correct reader to open a relay. The schematic is the same with Annaane's with the difference I have 5 ...
Past's user avatar
  • 11
1 vote
2 answers
282 views

Detecting different objects closeness

iam currently working on a new project, where i would like to detect the existence/closeness of several objects around the arduino up to like 1 meter. I was thinking about an rfid setup, but as the ...
sebbo111's user avatar
0 votes
0 answers
415 views

4 RFID with Arduino Uno / add or remove card with master card /

i am new in coding for arduino. I need some help with the project i'm working on. my project is a object tracking by using the rfid rc522 for inventory system. so i need to have multi reader in this ...
SHIE's user avatar
  • 1
1 vote
0 answers
79 views

RFID RC522 Serial Communication converting problem

I am new to the RFID Scene and Serial communication as well. So I am trying to use the RC522 RFID module and I wrote in block 22 - 0x36 which is 6. I want to write a code where I take whatever is in ...
tsotniuspious's user avatar
2 votes
1 answer
400 views

Arduino Project Interrupt Error?

I have a project to be made i.e. water Billing System using RFID(Mfrc522) on Arduino NANO. There is one difficulty that I haven't been able to overcome. I hope someone could help me out. Project flow: ...
harshit rathod's user avatar
1 vote
0 answers
105 views

Does MFRC522 module read all 13.56 MHz RFID tags?

Hello everyone. Does MFRC522 module read all 13.56 MHz RFID tags? Or there are different types of the 13.56 MHz tags that the MFRC522 module reads only one type of them?
elie saade's user avatar
1 vote
0 answers
596 views

I am trying to rewrite an RFID with a MEGA2560 and a RFID-RC522

I have been trying to rewrite an RFID tag so it is the same as my other one. I have code that will read both separately but I cannot find any already written for the MEGA2560 that will work for me. ...
cameron cain-jones's user avatar
1 vote
4 answers
7k views

Read Simultaneously RFID TAG with multiple RFID Reader [MFRC522]

i have a project that use two RFID Reader, the project for counting tag from conveyor belt, in this case the reader will placed in the middle of the conveyor belt and the reader faces each other. So ...
drididi's user avatar
  • 11
0 votes
1 answer
48 views

Matching incoming data with a variable

I have a system where an RFID tag can be checked and Its individual 4byte UID will be printed. My task is to check if subsequent tags have the same UID and if not, print “access denied”. I'm assuming ...
Zèro 's user avatar
1 vote
1 answer
639 views

Print 2 numbers stored in 24-bits in decimal format

An implementation function from the nice little Wiegand library YetAnotherArduinoWiegandLibrary prints a hexadecimal representation of a facility # & card # (8-bit facility #, 16-bit card #) — 24 ...
micahwittman's user avatar
1 vote
2 answers
249 views

How to multitask with interrupts on Arduino?

I am trying to build a cashless RFID based water dispensing unit. I am using Arduino mega 2560, PN532, relay, flow sensor. Here is the flow of the program in I2C mode; I have two functions, one to ...
Riya's user avatar
  • 13
1 vote
2 answers
3k views

multiple RC522 RFID on arduino yun

I was trying for one month to make multiple RC522 rfid readers work together on SPI on an arduino yun, one works fine, but if I plug 4, each with a specific slave select, only one, sometimes 2, ...
Neil's user avatar
  • 143

1
2 3 4 5