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?