This low cost  MFRC522 based RFID Reader Module is easy to use and can be used in a wide range of applications.

The MFRC522 is a highly integrated reader/writer IC for contactless communication at 13.56 MHz.

Features:

• MFRC522 chip based board
• Operating frequency: 13.56MHz
• Read Range: Approx 3cm with supplied card and fob
• SPI Interface
• Max Data Transfer Rate: 10Mbit / s
• Dimensions: 60mm × 39mm.

Aruino Wiring

   RC522 MODULE        UNO      MEGA
   SDA(SS)             D10      D53
   SCK                 D13      D52
   MOSI                D11      D51
   MISO                D12      D50
   PQ                  Not Connected
   GND                 GND      GND
   RST                 D9       D9
   3.3V                3.3V     3.3V

• Datasheet