Mainboard

The Seeeduino Mega will be my choice as main controller. This board is 100% arduino platform compatible. So it's very easy to develop, program and test. The advantage above the original arduino mega is that the Seeeduino Mega is a bit smaller.

Weight: 25.3 grams
ATmega 1280 @ 16MHz
Selectable 5V/3.3V operation
70 Digital IO
16 Analog inputs
14 PWM outputs
4 Hardware serial ports (UART)
More info about the Seeeduino Mega

This litle mainboard will be the central control unit of the quadrocopter. All input sensors and all output control units will be attached to this board.