Table of Contents
RFID RC522
This is a very inexpensive RFID module with an MFRC522 integrated circuit and a PCB antenna.
Although the MFRC522 has I2C, serial and SPI interfaces, only SPI is available on this module.
Pinout
+-------------------------------------+ | ANTENNA | | | | XTAL NXPRC522 | | | + *SDA SCK MOSI MISO IRQ GND RST 3V3 + *SDA is the SPI NSS (slave select) input.
RPi
| Pin | ALT | RFID RC522 |
|---|---|---|
| GPIO8 | CE0 | SDA |
| GPIO11 | SCLK | SCK |
| GPIO10 | MOSI | MOSI |
| GPIO9 | MISO | MISO |
| IRQ | ||
| GND | GND | |
| GPIO25 | RST | |
| 3V3 | 3V3 |
