I'm working on a soccer robot, I need to control motors for it's
movement. I have purchased the "Lynxmotion" "h-bridge" aswell as
the Texas Instruments "SN754410". On initial inspection of
instructions of each, it seems that they can only control the motor
to be forward/reverse (I think the h-bridge may have one lower speed
setting). I was just wondering, anyone whose used these motor
controllers before, is this right? Can it really only control the
motors to go at one speed or is the speed variable?