Platform Drive Control.
This platform is driven by two wheels mounted so that the wheel axis
is just off center. There is a small caster wheel mounted in the 'rear'.
At this time there is no speed control feedback.
Maneuvers are accomplished by independent but coordinated control of
each wheel motor.
The drive motors are servos that have been hacked to continuous rotation.
The servo hack involved pulling the feedback control board and pot as
well as cutting the stop on the main gear. Thus the servos are converted