This would be a buck converter with an adjustable speed range of 0 to 100%, with a simple wireless remote based on infrared or RF technology. The controller must be simple: start, stop, accelerate, decelerate, and must be convenient to use and easy to learn. Ideally, it sends a single that can be used in conjunction with the immediately preceding motor control project. An alternative would control a pair of motors, to support steering. This would be the basis for a very efficient robot or wireless car.