Access control system


I am working on a smart door access project .. I use the Arduino Uno and RC522 module and I have some questions about the reader

1- What is the RC522 Reader module and what is the functions for each pin ? Why the IRQ pin it dosent use with Arduino ?

2- How to communicate between the card and the reader ?

3- What is the process when the card scan the reader ?

4- SPI how it’s done with RC522 Reader


Is Google broken today? Those details must be in a hundred tutorials by now.

What is the RC522 Reader module

It reads certain types of RFID cards. Consult the product manual for connections and usage information.