I also want to control my 3,5" floppy (bipolar) stepper motor. I already tried it but it doesn't turn, it only schockes from left to right.
I also have a unipolar stepper motor but I tried this:http://www.arduino.cc/en/Tutorial/StepperUnipolar
I don't know how to connect te wires. When I connect the yellow, black, brown and orange to the digital ports and the red one to the ground, it turns. But when I disconnect the red wire it still turns, without a connection to the ground. It doesn't have much torgh too.