[DBMJ99]

For quick prototyping we wire up a motor controller in between the battery and the motor (and an in-line automotive fuse) and then use the thrifty throttle from Andymark to control the motor controller. This allows students to vary the speed of the motor to try various experiments. At $29 it's a lot cheaper than tying up a robo-rio for this and it's a lot quicker to set up.