Arduino Mega 2560 Rev3

The Arduino Mega 2560 is an arduino 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 Uno, Duemilanove or Diecimila.

The arduino Mega 2560 is an update to the Arduino Mega, which it replaces.

Additional features coming with the R3 version are:

• ATmega16U2 instead 8U2 as USB-to-Serial converter
• 1.0 pinout: added SDA and SCL pins for TWI communication placed near to the AREF pin and two other new pins placed near to the RESET pin, the IOREF that allow the shields to adapt to the voltage provided from the board and the second one is a not connected pin, that is reserved for future purposes
• stronger RESET circuit 

• 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

• Arduino Mega2560 Rev3 x1

• Arduino Official Board Selection Guide
• Atmega2560 datasheet
• Mega Schematic
• Arduino IDE
• Arduino Mega product page
• Arduino - Getting Started