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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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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How to read/write a 125 kHz RFID tag or card? [closed]

Can someone tell me (I think not only I'm interested in it) how to write a 125 kHz tag or card? There is a video on Youtube where this Russian guy makes his module from scratch, but I want ready-made ...
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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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61 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 ...
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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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22 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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30 views

how write or change the data on writable tags like tk4100, hitags256, em4305 125khz tags?

I have arduino uno and rdm6300 module with tk4100, hitag s256, em4305, nxp s256
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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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2answers
87 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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how can i interface this coding with 4 rfid rc522 module? [duplicate]

#include <SPI.h> #include <Wire.h> #include <MFRC522.h> #include <LiquidCrystal_I2C.h> #define RST_PIN 9 #define SS_PIN 4 #define STATE_STARTUP 0 #define STATE_STARTING ...
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60 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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25 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 ...
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1answer
101 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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19 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?
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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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3answers
385 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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1answer
30 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 ...
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1answer
22 views

Is it possible to code a combination lock with RFID? [closed]

as part of one of my projects for university, I am required to create an interactable contraption. I'm thinking about making a puzzle where you need to scan three rfid tags in the correct order to ...
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1answer
123 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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13 views

RFID reader(125kHz) switching between antennas

My arduino application wants multiple separate cards in multiple separate (nearby) locations to be readable at roughly the same time. I am using a RDM6300 module, with a multiplexer to switch between ...
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2answers
95 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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239 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, ...
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43 views

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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3answers
149 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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45 views

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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Changing user access byte of RFID card caused breaking the sector

I wanted to write 0xBC to the unused byte 9 of trailer block 63. What I did: Opened ReadAndWrite example of MFRC522 library Change these lines: These: byte sector = 15; byte blockAddr =...
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1answer
69 views

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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1answer
211 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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2answers
153 views

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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1answer
376 views

Can 1 wiegand output for 2 controllers?

recently I have this project which needs to read 2 wiegand signal using Arduino Mega 2560. I have an access control device which will output wiegand signal once the user is allow to enter, and there'...
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53 views

Is it possible to write URLs to RFID tags with the RC522? If so, how?

I've been trying to research to answer this question for a long time, but could not figure out the answer. I know how to code like bytes of information, but not URLs. More specifically, when you code ...
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1answer
256 views

Does MFRC522 supports native SPI of Arduino Due?

Does MFRC522 library support native SPI interface of Arduino Due? By native SPI I mean this one: I came here with this question because the initializer asks for 2 pins: SS and Reset: MFRC522(byte ...
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30 views

Can the following materials be used to power up an attendance based sensor?

arduino uno, esp8266, rfid module rc522, sd card module, real time clock module, buzzer, led light and battery holder. I was planning to build a sensor that monitors attendance with the use of and ...
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1answer
57 views

Using Arduino as contact to the world for linux box if app crashes

I am new to this micro controller thingie world so bare with me :) Let me describe a scenario first. Say I have a linux box for house automation embedded in a wall. For security reasons is the only ...
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1answer
412 views

How to connect SPI device on Etherntet shield on Arduino Uno

In my project I need to connect RFID reader (RC522) on top of the Ethernet shield because of it's capability of reading and editing SD card. When I connect only RFID sensor on Arduino, it works. Same ...
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1answer
258 views

NodeMCU: Wiegand not working for one device, while working for another

I'm using a NodeMCU, and a working code for reading Wiegand data, with this library. I managed to successfully read the Wiegand signal from this device. However, I also have this new AR-721H device, ...
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2answers
111 views

How Should I Send Data to My Laptop from Multiple Arduinos?

I'm working a project which involves reading multiple RFID tags, from multiple directions, at the same time. Because of the multiple directions, I need to use multiple antennae. Because of the ...
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2answers
225 views

Garage Door Opener RFID failing after a period

I've been building an add on to my garage door opener that will allow it to be opened from the outside with a valid RFID token or from inside using push buttons. This works as expected when first ...
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474 views

How to Insert Data in Arduino's Direct Mysql

As inserted in a Arduino Mysql Direct Tablela I'm new to Arduino and would like to know how to do something in the code to make a copy in the database This code to pass the RFID and authorized ...
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1answer
68 views

HTTP myphp request error RFID

This program is a program which readings of rfid are saved to myphp database. I have a problem when running the code The wifi is connected but when the code doesn't save im assuming that the problem ...
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28 views

How to use sparkfun qwiic rfid with arduino uno [duplicate]

https://learn.sparkfun.com/tutorials/sparkfun-qwiic-rfid-idxxla-hookup-guide Hardware: Arduino UNO R3 Sparkfun qwiic rfid Id-20LA I followed this tutorial. I used the code on the website. I don't ...
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104 views

How to use sparkfun rfid qwiic reader

Project(skip to here if you don't care): I wanna use the rfid tags as products that i send to a mobile app and from there a suite of different applications. I succeded with a mfrc522 but only for 3cm ...
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1answer
21 views

Can i use a sparkfun rfid qwiic without an id-xxla? [closed]

Sparkfun rfid qwiic id-20la I am using an Arduino UNO R3. You should assume that i don't know anything. If yes can you give some information about how to do it? Thanks for any help.
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77 views

Problem in interfacing EM18 reader with Arduino Mega

When we interfaced em18 reader with Arduino Uno it was properly working but with Arduino Mega it is not working but all other components are properly with Arduino Mega. Receiver and transmitter LEDs ...
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1answer
724 views

RDM6300 continuous RFID tag read

I have an RDM6300 connected to an Arduino Mega and code that can read the tag just fine: // Function prototypes void setup(void); void loop(void); // RDM6300 packet details #define ...
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36 views

Arduino Port randomly changes whenever I punch correct RFID tag

I was working on an Electronic Door Lock/Unlock system using Arduino Uno and RFID Reader/Tags on Ubuntu 18.04.02 lts. Now the problem is that whenever I punch-in the correct RFID tag to the RFID ...
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0answers
214 views

Problem interfacing both esp8266 and EM18 with Arduino Uno

I have connected esp8266 with Arduino Uno and programmed 8266 with Arduino IDE to send data to firebase over WiFi. Now I also want to interface EM18 RFID Reader with Arduino in order to read the RFID ...
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1answer
51 views

Is SPI a good way to connect two rfid modules on separate arduino boards?

RFID access control I have two separate rfid projects on separate arduino, the first project requires 2 minutes of contact between the tag and the reader after which it turns the LED on. the second ...
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1answer
98 views

Is there a way to have the LED switch on after 10 readings or say a minute?

I am using Arduino for a RFID project where the LED must switch on after either 12 readings of the tag or 2 minute, the tag reading happen every 10 seconds. I can't seem to figure out a way to have ...

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