I have a large bipolar stepper motor. What's the simplest circuit to drive it with a microcontroller (arduino)?
I have a large stepper motor with 4 wires (bipolar) from an old printer and I assume it's 12 volts, or at least higher than 5v. I have plenty of transistors: 2n3904, 2n2222, 2n4401 and 2n3906 (PNP). How do I drive the stepper with output from an arduino? (simple H-bridge schematic?)
Also, how can i find how many steps it has?