Motor Stepper Example

[mslaney]

I guess what I 'm asking is....Do I need an H bridge or is it a function of the program?

[hansknec]

If you are driving a bipolar motor you will need a dual H-bridge circuit. (2 coils each need dual driving polarity). The code presented earlier in the thread appears to me to be for driving a unipolar motor. Since you appear to be familiar with the allegro driver chips you should see that they would only require two outputs from a PIC to drive the motor. One is a direction bit and the other is toggled the amount of steps you want. I prefer using unipolar motors myself because they are easier to build a drive circuit using only 4 FETs.

John