Comments on: Controlling a Stepper Motor with an Arduino Part 2 http://www.azega.com/controlling-a-stepper-motor-with-an-arduino-part-2/ Tue, 17 Aug 2010 17:42:52 +0000 hourly 1 http://wordpress.org/?v=3.0.1 By: admin http://www.azega.com/controlling-a-stepper-motor-with-an-arduino-part-2/comment-page-1/#comment-174 admin Tue, 17 Aug 2010 17:42:52 +0000 http://www.azega.com/?p=151#comment-174 Matt, you can try moving the snubber diodes to +5 instead of ground (anode to motor input and cathode to +5) so they are in parallel with the coils. This is probably how they should have been hooked up anyway to better suppress the voltage spikes caused when each coil is turned off. The voltage spikes are probably what's causing interference between the two motors. Here is more information on snubber (flyback) diodes: http://en.wikipedia.org/wiki/Flyback_diode Matt, you can try moving the snubber diodes to +5 instead of ground (anode to motor input and cathode to +5) so they are in parallel with the coils. This is probably how they should have been hooked up anyway to better suppress the voltage spikes caused when each coil is turned off.

The voltage spikes are probably what’s causing interference between the two motors.

Here is more information on snubber (flyback) diodes:
http://en.wikipedia.org/wiki/Flyback_diode

]]> By: Matt http://www.azega.com/controlling-a-stepper-motor-with-an-arduino-part-2/comment-page-1/#comment-163 Matt Sun, 08 Aug 2010 19:53:19 +0000 http://www.azega.com/?p=151#comment-163 Thank you for posting this. I used this circuit and it works great. I built a second and hooked it up to two of the remaining pins on the arduino and the two motors seemed to interfere with each other and neither worked properly. Any ideas of what is needed to run multiple steppers using a few of these circuits? Thank you for posting this. I used this circuit and it works great. I built a second and hooked it up to two of the remaining pins on the arduino and the two motors seemed to interfere with each other and neither worked properly. Any ideas of what is needed to run multiple steppers using a few of these circuits?

]]> By: Charlie Chisholm http://www.azega.com/controlling-a-stepper-motor-with-an-arduino-part-2/comment-page-1/#comment-142 Charlie Chisholm Sat, 26 Jun 2010 13:06:43 +0000 http://www.azega.com/?p=151#comment-142 I am having a problem with my interpretation of what you have done. When I have no load on any of the output lines to the stepper motor and check each one individualy, they work perfectly. But when I have a stepper attached (or even LEDs for test purposes, they all stay High. I would love to send the schematic of but do not see that option on this web site. I am having a problem with my interpretation of what you have done. When I have no load on any of the output lines to the stepper motor and check each one individualy, they work perfectly. But when I have a stepper attached (or even LEDs for test purposes, they all stay High. I would love to send the schematic of but do not see that option on this web site.

]]>