Arduino open source single board computer boards arduino a000069 the arduino adk is a microcontroller board based on the atmega2560 it has a usb host interface to connect with android based phones based on the max3421e ic it has 54 digital inputoutput 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 similar to the mega 2560 and uno it features