In message <33E45AB0.A3D180B6@ilink.nis.za>, Eric van Es writes >Hi folks > >This is slightly off the line BUT: I need to build a maze-solving robot >using a PIC. I've got a couple of stepper motors from old disk drives >etc. Some are Japan Servo Co and Teac. Any idea where I can find >datasheets/internal wiring diagrams? You should be able to work out the winding arrangement by measuring the resistances between the leads. You probably have two centre-tapped windings. A web search will turn up some info on the energising sequence you need. I recently built a simple interface for the printer port on my PC (using four BD139 power transistors) and wrote a little C program to drive a small 12 V stepper motor. It was quite easy. Leon -- Leon Heller: leon@lfheller.demon.co.uk http://www.lfheller.demon.co.uk Amateur Radio Callsign G1HSM Tel: +44 (0) 118 947 1424 See http://www.lfheller.demon.co.uk/rcm.htm for details of a low-cost reconfigurable computing module using the XC6216 FPGA