RC522 RFID Module
From Leo's Notes
Last edited on 30 December 2021, at 01:19.
The RC522 is a cheap RFID reader module. I bought one from Ebay for $3 CAD with free shipping but that turned out to be a counterfeit since the firmware version was 0x12 rather than 0x9{0-2}.
Usage
The library project is at https://github.com/miguelbalboa/rfid