The L293D contains two H-bridges (for more information on H-bridges, click here.) for driving small DC motors. It can also be used to drive stepper motors because stepper motors are, in fact, two(or more) coils being driven in a sequence, backwards and forwards. One L293D can, in theory, drive one bi-polar 2 phase stepper motor, if you supply the correct sequence.
We are going to show how to drive a bipolar and a unipolar stepper motor with the L293D. The bipolar stepper motor and the unipolar stepper motor we used were bought from Jameco. (part# 105881 and 105890 respectively). Both of the bipolar and unipolar stepper motors are 3.6 degrees/step motors.
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