The Arduino Mega 2560 is a microcontroller board based on the ATmega2560
(datasheet). 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.

It contains everything needed to support the microcontroller; simply connect it to a computer with a USB cable or power it with a AC-to-DC adapter or battery to get started. The Mega is compatible with most shields designed for the Arduino Duemilanove or Diecimila.

• Microcontroller ATmega2560
  
• Operating Voltage 5V
  
• Input Voltage (recommended) 7-12V
  
• Input Voltage (limits) 6-20V
  
• Digital I/O Pins 54 (of which 14 provide PWM output)
  
• Analog Input Pins 16
  
• DC Current per I/O Pin 40 mA
  
• DC Current for 3.3V Pin 50 mA
  
• Flash Memory 256 KB of which 8 KB used by bootloader
  
• SRAM 8 KB
  
• EEPROM 4 KB
  
• Clock Speed 16 MHz