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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 the this module.
Pinout
+-------------------------------------+ | ANTENNA | | | | XTAL NXPRC522 | | | + *SDA SCK MOSI MISO IRQ GND RST 3V3 + *SDA is the SPI NSS input.
