RFID (RC522)

This project demonstrates how to interface an RC522 RFID reader with a RPi using Python. The RC522 communicates over SPI.

Hardware Required

• RPi 4B
• RC522 RFID module
• Jumper wires
• RFID tags/cards

GPIO (RFID → RPi GPIO)

RFID GPIO	RPi GPIO
SDA	GPIO 8 (CE0)
SCK	GPIO 11 (SCLK)
MOSI	GPIO 10 (MOSI)
MISO	GPIO 9 (MISO)
IRQ	Not connected
GND	GND
RST	GPIO 25
3.3V	3.3V

Features

• Chip : It is based on the MFRC522 integrated circuit from NXP Semiconductors.
• Frequency : Operates at 13.56 MHz.
• Communication : It can communicate with a microcontroller using the SPI protocol & also supports I2C & UART.
• Reading : The RC522 module emits a radio signal via its antenna.
• Do not connect to 5V The RC522 is a 3.3V device.

Setup on RPi

sudo raspi-config
# Go to: Interface Options → SPI → Enable
sudo reboot

ls /dev/spidev*

pip3 install spidev mfrc522