Interfacing circuits
The bipolar stepper motor usually has four wires coming out of it. Unlike unipolar
steppers, bipolar steppers have no common center connection. They have two
independent sets of coils instead. You can distinguish them from unipolar steppers
by measuring the resistance between the wires. You should find two pairs of wires
with equal resistance. If you’ve got the leads of your meter connected to two wires
that are not connected (i.e. not attached to the same coil), you should see infinite
resistance (or no continuity).
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