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 RFID RC522 Only Works Sometimes – Unreliable Detection Issue
Problem Overview
I’m using an MFRC522 RFID module with an Arduino Uno, and it only detects RFID tags sometimes. The behavior is inconsistent—sometimes it reads the card instantly, and other times, it ...
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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 ...
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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....
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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 ...
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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 ...
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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 ...
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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 ...
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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, ...
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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,...
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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 ...