Ok... I'm not trying to do anything complex. No microstepping/current limiting, etc. All I need is basic movement: foward, reverse, and turning. I am using bipolar steppers and the circuit shown below. I am having trouble with the sequence, though. The motors move, but the direction seems arbitrary, and can be forced to reverse by grabbing the wheel attached to the shaft. The torque is ridiculously low.
Any ideas?
Any ideas?