MFRC522 chip RFID module pinout. (full image link, PNG ~600KB)
For Arduino connection use:
* Pin layout should be as follows:
* Signal Pin Pin Pin
* Arduino Uno Arduino Mega MFRC522 board
* ------------------------------------------------------------
* Reset 9 5 RST
* SPI SS 10 53 SS
* SPI MOSI 11 51 MOSI
* SPI MISO 12 50 MISO
* SPI SCK 13 52 SCK
First, you need to download MFRC522 - Library