The circuit is not particularly susceptible to motor transients and supports FULL STEPS FORWARD, FULL STEPS REVERSE, ACTIVE HOLD, and POWER OFF aka RELEASED. If the motor does not turn then swap around the leads of ONE of the two coils. To reverse the sense of the EN signal simply rework the circuit around an [...]
This is an easy to build stepper motor driver that will allow you to precisely control a unipolar stepper motor through your computer’s parallel port. With a stepper motor you can build a lot of interesting gadgets such as robots, elevator, PCB drilling mill, camera panning system, automatic fish feeder, etc. If you have never [...]
On these pages, I will introduce a control circuit for stepper motor. The software of this project is adapted to Embedded Systems(Lab13) for 2002 of Cleveland State University.
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Stepper Motor Driver using L298 and L297
Read More Source
http://www.hobby-elec.org/e_step.htm
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