Hi Robin,
Thanks that was very useful! I have had a little play with some old salveged steppers (EX printer, etc) and hope one day to build a bot using them for accurate movement and perhaps drawing, etc or as I suggested to someone the other day a Pantagraph? or drawing machine!! I have used the good old ULN28003, but the new A4988 type of modules make it a lot easier with only two signals STEP & DIR. Fixing wheels on a 5mm shaft can be tricky....
Regards
Mel.