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

• Supply Voltage: 3.3V

• Current: 13-26mA

• Read Range: Approx 3cm with supplied card and fob

• SPI Interface

• Max Data Transfer Rate: 10Mbit / s

• Dimensions: 60mm × 39mm

Communicating with an RC522 RFID module is a lot of work, but luckily for us there is an Arduino library called the MFRC522 library that makes reading and writing RFID tags simple.