The MEGA 2560 is designed for more complex projects. With 54 digital I/O
pins, 16 analog inputs and a larger space for your sketch it is the
recommended board for 3D printers and robotics projects. This gives your
projects plenty of room and opportunities.
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.