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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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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37 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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31 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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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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MFRC522 miguelbalboa/rfid library problems (alternative library?)

I have user more than 100 cheap chinesse MFRC522 modules (on NODEMCU/LUA). Few years ago they was idenctified as 0x91, 0x92, from year ago they come with identifier 0x12. That never caused trouble on ...
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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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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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21 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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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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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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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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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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100 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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28 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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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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44 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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64 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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Serial.available is working only for the first time

I am working on RFID. I am sending data through serial monitor and the Serial.available is not identifying the data after the first time, its working perfectly fine only once after reopening the ...
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48 views

Can't store RFID data in the next 5 bytes of array

I'm working on RFID project to handle multiple cards. I did most of the things OK. But now I have one problem. Which is the following: The RFID code is 5 bytes, so I need an array of 5 bytes. If ...
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86 views

RFID Door Lock Coding Errors [closed]

I am trying to recreate an RFID door lock that I saw on the Arduino project hub but have ran into several issues. I had to manipulate the code slightly to make sure it was including the correct ...
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265 views

Reading NFC card (PN532) with Arduino Uno

I am trying to detect a RFID card using the NFC-PN532 module and Adafruit_PN532 library. Initialization code:- #include <Adafruit_PN532.h> #include <Wire.h> #define SCK (13) #define ...
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Reading Multiple RFID tags / Reading and ignoring/holding the tag

I'm currently doing a project where ideally I will have multiple objects with RFID tags on them that are placed on top of a Adafruit PN532 RFID Shield connected to a Arduino Uno Wifi Rev 2. The idea ...
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How to put the inputs in array?

I face a problem and I really need help. For my Arduino project, I'm using RFID reader with tags. The story is, I have a desired arrangement for the cards and I defined it as an array called desired[]=...
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Totally unresponsive card with RFID-RC522 Module

I bought an RFID-RC522 module including two attached PICC cards: a blue key chain tag and a white card with the type of MIFARE 1KB. In addition, I bought two other separate cards from the same seller. ...
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Arduino based attendance system

I am working on a RFID based attendance system. I am using Grove-125 kHz RFID reader, SD card module, DS1307 RTC and Arduino Mega. Each component works alone (separately) with the Arduino well, but ...
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How to write a more compact ANDed conditions with if statement?

I'm working on the rfid module and found an example that do it well. But it has a long testing the 5 bytes of the rfid received bytes, and I've tried to write it in a more compact way. I did it with ...
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Arduino program to scan two different rfid cards in same program ? Im using nodemcu- esp8266 , rc522 reader and Firebase

/*My project is a Library management system using rfid cards. Im trying to generate a code wherein User first scan a book and then the record will be pushed in Issued_Books table in Firebase . Then ...
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How do I grab data from my Arduino device using a Python program? [duplicate]

We are currently creating a system which can log student attendance using RFIDs. Currently, we have the RFID Scanner set up (MFRC522 reader and Arduino UNO microcontroller). The database for the ...
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Why is this Code not working with Esp8266 when it worked perfectly with Arduino Uno?

I'm making an attendance System using an RFID scanner, scanning RFID Card & saving Data in Excel. When I used this code with Arduino Uno (by changing #define SS_PIN 12 and#define RST_PIN 9) it ...
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Rfid stops scanning after wrong card scanned

My Rfid reader stops scanning cards after scanning the wrong rfid card. It doesn't scan it anymore after turning off the relay. *It turns on the relay if my rfid card is the right one #include <...
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RFID scanner- HZ 1050 Module

I just bought a rfid scanner hz 1050 module at $5 to add to my project,in the module I see a lot of pins to male my connections. Am getting stuck on the ones to use for arduino. I will be glad to ...
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Can anyone explain this?

starting app without reboot espcomm_send_command: sending command header espcomm_send_command: sending command payload espcomm_send_command: receiving 2 bytes of data closing bootloader ...
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207 views

Problem “Didn't find PN53x board” Arduino NFC Card Reader

i am using the elechouse PN532 RFID Module with an Wemos D1 mini in the Arduino IDE. I use the ISO1443a_uid example from the elechouse library. All works fine if i plug the USB Cable into the wemos ...
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303 views

RFID-RC522 not working with Arduino Uno clone

I am using this library https://github.com/miguelbalboa/rfid, and using DumpInfo.ino from it: /* * ----------------------------------------------------------------------------------------------------...
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RFID RC522 reads the previous tag serial with different tag

I hope someone can help me. I'm using a Mega with RC522, and this happens: I use a tag, it reads the right serial (e.g. AA:BB:CC:DD). Then I use a second tag and sometimes it gives me the correct ...
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973 views

Emulating a generic Mifare USB peripheral device with RFID-RC522

Hardware Dev Board: Arduino Nano V3.0 Module: RFID-RC522 13.56 MHz Cable: USB A - USB Mini B Configuration Physical Code /* * -------------------------------------------------------------------...
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How to add if condition with RFID Example

Using a Arduino Mega 2560 and PN532 NFC/RFID module, I want to be able to scan a card and see if it's value is (0xF0, 0x21, 0x5D, 0xA7). It should print "accepted" in the serial monitor. However ...
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395 views

How to convert byte array into a single variable

In this code i am taking the TID data(20bytes of 160bits) in the form of array according documentation and and its working correctly and getting the output of RFID tags. Now I just need your guidance ...
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344 views

How to connect Sparkfun M6E Nano UHF Rfid reader and ESP8266 NodeMCU 0.1

I am using an ESP8266 NodeMCU v0.1 and Sparkfun M6E Nano UHF Rfid reader. How to connect NodeMCU to M6E Nano UHF Rfid reader?
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Linked List based question

I am making a Smart Cart using RFID. The user will have a RFID card. As soon as he swipes the card on the RFID Reader it will identify the user and will create a linked list for that particular user. ...
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NodeMcu pins and an RGB LED

I'm using a NodeMcu for my project and am running out of pins to use. I have a MFRC522 Module, IR Receiver, Buzzer and RGB LED connected. I am facing the problem that whenever I start scanning for ...
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332 views

What does this lines mean in RFID UID Card Reader Code?

I'm currently doing a project using RFID. I'm wondering how this lines of the code work. I know that this has something to do with getting the UID of a scanned/tapped card, but can someone please ...
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Arduino Uno - How to write personal data in NTAG213 using RFID-RC522

I am trying to write some data in NTAG213 sticker with this code: #include <SPI.h> #include <MFRC522.h> constexpr uint8_t RST_PIN = 9; // Configurable, see typical pin layout above ...
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Hex/Byte Reversing and Conversion

I'm working on an RFID system using a MFRC522 with this Library : https://github.com/miguelbalboa/rfid Here's the code I have right now: int A=(mfrc522.uid.uidByte[0]); int B=(mfrc522.uid.uidByte[1]);...
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Power RFID module using GPIO

I am building an ESP8266 device that uses RFID but need to conserve battery power. The ESP is a Wemos D1 Mini and the RFID module is a RC522 (still waiting for it to arrive), which needs 3.3 V. ...
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623 views

MFRC522: Firmware Unknown

Can someone help me what is the meaning of this sketch? It always outputs in the serial monitor: Firmware Version: 0x1C = (unknown) Scan PICC to see UID, SAK, type, and data blocks... This is the ...
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644 views

Arduino RFID with motor and limit switches

Thanks for looking into my Arduino code. I'm building an automated sliding draw, and I'm trying to activate the motor with a RFID scanner. The scanner waits for the token, and once it detects a token ...
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1answer
75 views

How to run Arduino code on Linux? [closed]

I want to use an MFRC522 module as explained in this video. But is it possible to get around with Arduino and use a TTL to USB converter to connect RC522 directly to my PC running Ubuntu? Using the ...
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1answer
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RFID-RC522 Cannot read from MIFARE Ultralight

I tried many ways to get and print UID and other data from MIFARE Ultralight but it always ends with error. I am using RFID-RC522 reader with Arduino UNO and MFRC522 Library. I can normally get and ...
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955 views

Save Leading Zero HEX into String RFID RC522 Arduino

I'm using RC522 to read RFID card. All is until if the HEX leading by 0 then i can't save it into String. But if i print it to Serial all is well. Here is my code: #include <SPI.h> #include <...