Plug the RFID module into the breadboard with enough space around it. Connect the VCC pin to the Arduino's 3.3V (not 5V), and GND to the ground rail. For the data connections, wire SDA to Pin 10, SCK ...

I just received my RC522 RFID reader and made this simple Arduino access control system that uses the reader ... On the next lines you need to change the cards codes with the ones you have. You’ll ...