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The Arduino ADK R3 is a microcontroller board based on the ATmega2560. It has a USB host interface to connect with any Android based phone or tablet.
It is compatible with Android's Accessory Development Kit examples. It has 54 digital input/output 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.
The Arduino ADK is based on the Arduino Mega 2560. Plus, it has an USB Host circuit that enable this board to communicate with USB devices, and give them power supply.
Additional features coming with the R3 version are:
6 ft. USB mini cable.
This is a bidirectional level shifter used to step down or up signals from 1.8V to 5V range.
These large Tiller Traction Lug wheels are 13" in diameter. They come as pair and have steel 5/8" diameter shafts and bearings.
The Micro Maestro is the smallest of Pololu’s second-generation USB servo controllers. The Maestros are available in four sizes and can be purchased fully assembled or as partial kits.