I've seen a web page that described how to do this, long time ago, can't remember details or where. Sorry. Possibly on the 'Jones on steppers' page. For unipolar (5 or 6 wire), I use a battery. Almost any voltage will do. For 6 wire models, 2 wires are usually the same colours (rarely black), this is the common. For 5 wire, apply voltage to 2 random wires and see if the rotor turns. Remove the second wire, and randomly pick another. If the rotor moves this time, the first wire is the common, otherwise it's the one you removed. Then touch each wire to the battery until you find one that spins clockwise. Call this A. Pick another wire. If it goes clockwise too, call it B, and so on. If it doesn't, re-apply A, then pick another wire. Eventually you get A,B,C & D, and it should spin clockwise when voltage is applied in sequence. Reverse the sequence, and the motor should go backwards. For bi-polar (4 wire), I use a LED. Put it across 2 wires, and spin the rotor. If it flashes, there's your coil. Doesn't tell you polarity. (At this point I hook it to the driver. If it doesn't work I reverse one coil). As you spin it, it will only light on every 2nd step as the voltage reverses. I suppose if you put a LED on each coil, and got the polarity right, they'd flash in sequence, a bit like quadrature encoders. Could use 2 pin red/green leds and figure out what the sequence should be if wired correctly. Tony > -----Original Message----- > From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu]On Behalf > Of kenash1 > Sent: Tuesday, 1 March 2005 2:43 AM > To: Microcontroller discussion list - Public. > Subject: Re: [EE] Finding stepper motor wiring > > > Does anyone have any ideas on how to identify stepper wiring > beyond James? > Really want to know. > > Ken Wilson > > ----- Original Message ----- > From: "Olin Lathrop" > To: "Microcontroller discussion list - Public." > Sent: Monday, February 28, 2005 8:19 AM > Subject: Re: [EE] Finding stepper motor wiring > > > > kenash1 wrote: > >> That would > >> be more appreciated than your lashing out at someone who's just trying > >> to be helpful, wouldn't it? > > > > First, I wasn't "lashing out" at James' method. I originally kept quiet > > because I didn't think I had anything to add. I only responded > when James > > specifically asked why I didn't respond. > > > > > > ***************************************************************** > > Embed Inc, embedded system specialists in Littleton Massachusetts > > (978) 742-9014, http://www.embedinc.com > > -- > > http://www.piclist.com PIC/SX FAQ & list archive > > View/change your membership options at > > http://mailman.mit.edu/mailman/listinfo/piclist > > -- > http://www.piclist.com PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist