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Unread 02-10-2013, 14:24
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I am Dave! Yognaut
AKA: Brian Bray
FRC #1296 (Full Metal Jackets)
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Re: Maintaining perfect control of mecanums using encoders?

Quote:
Originally Posted by Ether View Post
Not really. More precisely, you are setting a PWM duty cycle value, which most closely correlates with applied voltage, not power.
I concur. You said what I guess I should have said, and what I meant. Power is indeed another property altogether

Quote:
In the above, are you referring to the duty cycle of the motor controller's output PWM, or the duty cycle of the PWM servo command signal coming into the motor controller?
I was referring to the PWM signal exiting the sidecar (or what the code SAID was exiting the sidecar). We did some testing last year involving a CIM in a KOP CIMple box, (yeah it isn't free speed I know, but was otherwise unloaded) Victor 884, a Talon, some incremental software (push a button to add .1 to the PWM value), and a 120fps GoPro (encoders are too mainstream ).

We didn't test it while loaded but it is a fairly obvious observation that you need more "juice" when it is harder to move.
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RIP David Shafer: you will be missed