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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Please i want to switch between two modes in my Arduino project.That's switching between a keypad lock mode and a RFID mode below is my to codes [duplicate]

First code #include <SPI.h> #include <Wire.h> #include <Keypad.h> #include <LiquidCrystal_I2C.h> #include<EEPROM.h> #define greenled 7 #define redled 6 ...
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Why the rfid_write_personal_data code in MFRC522 library use two blocks for writing?

I'm really confused on this one I noticed that the writing to tag is done for duel blocks (1,2) (4,5) what's the reason for that? the same library read function uses only the first block of each duel ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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1 answer
162 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 ...
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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 ...
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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 ...
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1 answer
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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 ...
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1 answer
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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 ...
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4 votes
1 answer
163 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 ...
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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. ...
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1 vote
0 answers
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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 ...
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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> #...
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2 votes
1 answer
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How can i make my MLX90614ESF scan temperature after the MFRC522 scans the RFID tag?

//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 // ...
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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. ...
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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 ...
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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> #...
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1 vote
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172 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. ...
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1 vote
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23 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 ...
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2 answers
181 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 ...
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271 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 ...
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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 ...
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2 votes
1 answer
272 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: ...
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1 vote
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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?
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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. ...
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4 answers
4k 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 ...
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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 ...
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1 vote
1 answer
377 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 ...
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2 answers
157 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 ...
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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, ...
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Is it possible to modify the animal tags (EM4305) with any module that works with Arduino? 134,2Khz

i have a lot of tags (Animal tags rounded yellow) EM4305, this have 15 spaces of memory and i need change ID writed, currently i'm using this module but it did not can possible write on tag, exist a ...
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1 vote
3 answers
245 views

Access Control System with an 4x3 Keypad & RFID-RC522

hey guys I have a access control system working perfect with rfid and keypad. I would like to implement : If the PIN is entered more than 3 times incorrectly the card is disabled. someone could give ...
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how to get serial data to wait until a certain length is reached

I have a code that loops through 2 different serial inputs on the arduino mega, and sends them to serial constantly: int RFIDResetPin = 13; void setup() { Serial.begin(9600); Serial1.begin(9600);...
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Does RFID-RC522 supoort tk4100 chip protocol ISO18000-2C 10 digital ID card?

I have ordered a starter kit and received RFID reader is RFID-RC522 module with one card and tag now I need more RFID card for my project and I can't find the supported card type for my project ...
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1 vote
1 answer
708 views

NodeMCU unable to communicate with MFRC522 RFID reader

I am creating 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. ...
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1 vote
2 answers
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How to make a dynamic menu with a sub-menu ( Arduino mega or Arduino Uno)

I have an arduino mega with a LCD shield (from keyestudio KS2056). I am trying to create a menu with a submenu that would have addable and removable strings based on inputs from a RFID scanner(addable)...
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Improper functioning of Node mcu when connected to source other than PC

I connected EM18 rfid reader to NodeMCU to read rfid card data. It showed card number very quickly and consistently till it was connected to my PC's USB. But when I connected it to 5v power source (...
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