Arduino Mega 2560 Rev3

The Mega 2560 is designed for more complex projects. The Arduino Mega 2560 is a microcontroller board based on the ATmega2560. It has 54 digital input/output pins (of which 15 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. It features the Atmega8U2 programmed as a USB-to-serial converter for easy plug and play.

More information is available on the website of Arduino.