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Unread 24-01-2011, 23:33
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FRC #1718 (The Fighting Pi)
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Re: Wheels spinning at different speeds program or electrical error?

Quote:
Originally Posted by DFZXA View Post
Well our team has strafing working somewhat. The problem is that two wheels are spinning slower than the other two. For example if I push left (to strafe left) on the joystick the back left and front right wheels will spin slower than the other two. Then the opposite happens when pushed to the right. We took a voltmeter to the jaguars to see how much power they are getting when given the command. It read around 2 volts (yikes) so something is definitely up. When reading on the driver station the pwms to the jaguars show me that two are getting less than the other two. I don't know what else to list then, but here's the code we are using (except I changed from two joysticks to one logitech 3d). Oh and ignore that it says gyro dawg. Thanks for the help in advance.
You have a couple clues.

2 volts on a jaguar output side? If the PWM's are showing different values, then they are telling the jag's to act differently. That also means that it's likely your controller is sending different values.

First, create 2 numeric controls in labview and hook THOSE up to your drive. See if you can get all full-speed values that way. I suspect you will be able to, and that this will point back at one of two things - you may not be calling out the axis' correctly on your new controller, or it may not be acting the way you expect.

Try going back to the logitech attacks and see if they function correctly. Remember - methodically narrow your problem down to one component: then you have the solution to your problem.
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