I would like to control a recycled stepper motor with UNL2003. I bought a downloaded a sample script from here Created a test circuit, and the controller is working fine with the 28BYJ motor.

I did my homework, found a few drawings, with this, or similar motors, but all of them was connected with 5 wires. The motor in the scanner was used with 4 wires (pin 1-2 and 4-5), the middle pin was not connected.

Of course, connecting to only 4 pins of the driver doesn't work. Can someome give me a hint, how to adapt a circuit like this to a 4-wire solution?

  • A stepper motor with 4 wires will (most likely) be a 2 phase bipolar stepper motor. Look for tutorials on how to control this kind of stepper motor.
    – Andy Lamb
    Commented Mar 3, 2017 at 17:58
  • Thank you, now I could find that while it is possible to wire the UNL2003 to drive bipolar motors, it is probably the best for this project.
    – vilmarci
    Commented Mar 3, 2017 at 19:16


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