----- Original Message ----- From: To: "Microcontroller discussion list - Public." Sent: Sunday, February 20, 2005 2:43 PM Subject: Re: [OT:]Bipolar Stepper Motor Controller > Lauren, > > The drive you have posted is a fairly simplistic one, so expect people to > point out lots of things that could be done to improve it. Do you know where I can find a better circuit for a bipolar stepper motor? I'd be very interested in seeing and maybe trying it. I've never played with stepper motors before so, I'm pretty much open to suggestions of any kind. I've never seached this list before, really don't even know how, but maybe I should try. > In answer to your questions - No, a series resistor wouldn't be required > but it would be a good idea to put say, 47k to ground on each of those > input signals so that the drive is disabled if the micro is in reset or > not in > control. > Ok, no series resistor in the "Enable" line but 47k resistors to ground from each of the three inputs. > If you swap pins 2 and 3 on the circuit, the pin numbers will match the > numbers you have given for your motor. > Then swap the the traces going to pins 2 and 3 on my circuit board. I really want to thank you for your assistance! Lauren > Steve. > > ================================================= > > On 20 Feb 2005 at 14:08, L. Barta wrote: > >> Hi, >> >> I'm fairly new to Pic's and to the electronics included in the >> attached schematic. I'd like to know if I could use a PIC16F84A to >> provide the input for the "Enable" input on this schematic without a >> series resistor or if I need to use one. I'd also like to know which >> of the four JP1 contacts goes to each stepper motor winding. The >> stepper motor I have has 13.2 ohms from pin 1 to pin 3 and the same >> from pin 2 to pin 4. I'm laying out a circuit >> board for this project now and really need answers >> to these questions before I can continue. >> >> Any help will be greatly appreciated! >> Thanks! >> Lauren >> > > > ========================================== > Steve Baldwin Electronic Product Design > TLA Microsystems Ltd Microcontroller Specialists > PO Box 15-680, New Lynn http://www.tla.co.nz > Auckland, New Zealand ph +64 9 820-2221 > email: steve@tla.co.nz fax +64 9 820-1929 > ========================================= > > > > -- > 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