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Stepper Motor Guidance

Hello, thanks in advance for any guidance you can offer on how to use these stepper motors I have.

they are 4 wires, red, black, yellow, gray.

3.1v, 3.6 ohms, 7.5 degrees


I know how to operate servos with PWM, but steppers seem to be more complicated, some have 4, 6, 10 wires etc.  unipolar, bipolar, etc.

based on what I've said so far, what can you tell me about what I have here, and how to control them, hopefully with PMW like servo's?

thanks again,




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Thanks TinHead, thats exactly the guidance I was looking for.

now I know its bipolar (they got meds for that :-), and now I have to learn about dual h-bridges.

I will review that site.