Hey

It\'s quite simple.... just pull voltage on one coil then the next... so on.. if backawards then just do it backwards

1 2 3 4 ->
4 3 2 1 <-

but a stepper motor can be runned in different modes (:

i got a source, but it was quick made, so don\'t think you can get the point in it.

just remember some timedelay, else it looks like you got some wrong coils...