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Unread 07-02-2016, 00:23
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FRC #1718 (The Fighting Pi)
Team Role: Mentor
 
Join Date: Jan 2007
Rookie Year: 1999
Location: Armada, Michigan
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Re: Motor is twitching even without input FRC labview

Quote:
Originally Posted by Alan Anderson View Post
What kind of speed controller are you using? I occasionally saw the original Talons "twitch" when something induced noise on the PWM cable.

I have also seen very brief twitches occur using RoboRIO firmware from several years ago when the robot code lost communication for a moment and disabled the PWM outputs at just the right/wrong time to make the speed controller think it had gotten a single "run backwards at high speed" pulse before timing out and shutting off. I thought that undesired behavior was fixed, though.
We struggled with that some last year as well. After we had one of our can-grabbers deploy and almost take off the head-mentors nose, we tried rerouting wires, etc. We never managed to completely beat the twitches though.