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The 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 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 2560 board is compatible with most shields designed for the Uno and the former boards Duemilanove or Diecimila.
Features: Microcontroller ATmega2560 Operating Voltage: 5V Input Voltage (recommended): 7-12V Input Voltage (limit): 6-20V Digital I/O Pins: 54 (of which 15 provide PWM output) Analog Input Pins :16 DC Current per I/O Pin: 20 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