IEIK Mega 2560 R3 ATmega2560-16AU + ATMEGA16U2 + USB Cable for Robot Arduino UNO MEGA2560 R3 The Mega 2560 is a microcontroller board based on the ATmega2560 The chip is Atmega2560-16AU and Atmega16U2, same with the official version. The Mega is compatible with most shields designed for the Arduino Duemilanove or Diecimila. It contains everything needed to support the microcontroller; simply connect it to a computer with a USB cable or power it with an AC-to-DC adapter or battery to get started It has 54 digital input/output pins (of which 14 can be used as PWM outputs), 16 analog inputs, 4 UARTs (hardware serial ports), a 16 MHz crystal oscillator, a USB connection, a power jack, an ICSP header, and a reset button