I 'umbly present my new Sensor Platform Universal Device, better known by the tortured acronym of SPUD. This little guy has an Arduino Mini for a brain, uses an L297D motor controller chip from Solarbotics to power the motors, and has a detachable USB interface for programming. It can go forward, backward, turn right and left, and spin in place right and left, using only four digital outputs from the Arduino to the motor controller. This leaves eight digital and eight analog lines open for sensor input and/or other gadgets.
Glee!
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