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Unread 09-04-2013, 23:33
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AKA: Joe Doyle
FRC #2729 (Storm)
Team Role: Programmer
 
Join Date: Oct 2010
Rookie Year: 2010
Location: Marlton, NJ
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Re: Question about encoders to control motor

Quote:
Originally Posted by gluxon View Post
This particular algorithm scares me a bit. Did your robot shooter motors have issues handling the stress of constantly reversing its rotation?
If you have your speed controller jumpered into coast mode (there's a jumper labeled "BC" for brake/coast), you shouldn't be stressing anything. I implemented a Bang-Bang controller on last year's shooter wheel for testing, and made some very scary-sounding repeated thunks from the wheel, but I think that was a chain re-engaging more than anything. We didn't go for a Bang-Bang this season, instead opting for a PID controller. It has worked quite well, but it required some significant tuning. At our last competition, we retuned the controller a little, and shortened our initial spin-up time by about a second. We might be retuning it a bit this weekend as well. We'll see.
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