This board is based on the Arduino MEGA 2560 but modified to allow its use with Google's Android Open Accessory Development Kit (ADK) as it has a built-in USB Host port.

Arduino MEGA ADK is a board based on an ATmega2560 microcontroller. It has a USB host interface port to connect it with Android devices based on the MAX3421e chip.

It has 54 I/O pins (14 of which with PWM), 16 analog inputs, 4 UARTs ports (hardware), 16 MHz crystal oscillator, a USB connector, a power jack, ICSP pins and a reset button.

It has an integrated Serial/USB converter based on an Atmega8U2 chip.

Features:

- Microcontroller: ATmega2560

- Power supply: 5VDC

- Power Input: 7-12VDC (recommended)

- Power supply input limits (maximum values): 5.5-16VDC

- Digital pins: 54 (14 with PWM)

- Analog pins: 16

- Current per pin: 40 mA

- Current on pin 3.3V: 50 mA

- Flash memory: 256 KB (8 KB used for boot loader)

- SRAM: 8 KB

- EEPROM: 4 KB

- Clock: 16 MHz