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Unread 15-01-2011, 13:47
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Programming Mentor
AKA: Jeff Beltramo
FRC #1922 (OZ-Ram)
Team Role: Coach
 
Join Date: Jan 2008
Rookie Year: 2006
Location: Concord, NH
Posts: 68
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Re: Holonomic Control System

Quote:
Originally Posted by Ether View Post
Ditto what Chris said about #1 and #2 and driver preference.

Since this is your first experience with holonomic, I hesitate to bring this up, but some have found that using the gyro as a fixed-angle reference to provide "field-centric" control (sometimes aka "driver-centric control") provides a superior driver experience with a quicker learning curve.

We ran mecanum last year as well and very pleased with it. As stated above, solution #1 is what we went with. Early there was a problem with inadvertent spinning of the robot, so we programmed a deadband to avoid spurious rotations. We also found we had to limit the rate of rotation. If we spun at max speed, this is when gyro error would creep in. I forget the response limit of the gyro, but it was obvious we were exceeding it. I would also concur with adding switches (joystick or other hardware) that allow re-zeroing and canceling gyro compensation completely. Drivers didn't use it often, but it did prove convenient a few times.
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Jeff Beltramo
Team #1922
Concord, New Hampshire