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Unread 02-02-2008, 00:15
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stanislav Sekacov
AKA: The Russian
FRC #1726 (N.E.R.D.S.)
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Re: Hyper 69 driving video

you should test your driving on carpet
and take in to account that there are going to be other bots on the field while driving. Your statagy might be speed but other bots might be very slow so you need to learn how to steer better.
try to program your controler to be less sensitive.
also try some omni wheels if you have a problem with turning
nice bot
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Unread 12-02-2008, 17:57
Ken Streeter's Avatar
Ken Streeter Ken Streeter is offline
Let the MAYHEM begin!
FRC #1519 (Mechanical Mayhem)
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Re: Hyper 69 driving video

Quote:
Originally Posted by baop858 View Post
... But has anyone notice that the victor are uneven, like in one direction there's slightly less power than if it was going in the other direction with the same amount of difference from neutral, 127.
Short answer: use 132 for the center, rather than 127. Yes, this is contradictory to everything in the IFI documentation and on their web site. However, our empirical tests bear this out again and again, on different motors. How did we get to this determination?

Well, we observed in 2005 that our robot's right side and left side drive motors seemed to be mis-balanced, and wrote the matter off to the fact that the motors on one side were going forwards and on the other side were going backwards.

In 2006 when programming a PID control loop for shooter azimuth control, we became convinced that the actual center for the victors is 132, rather than 127.

In 2007, we did yet more PID control for a multi-jointed arm, and again found the center to be 132.

In 2008, with PID control for the rack-and-pinion steering on our "Speed Racer" we have again found the PWM center to be at 132. We don't have an oscilloscope to verify this, but have verified this empirically again and again.

For another datapoint, check out the camera control code at kevin.org. Oddly enough, you'll find that the center value used is 132...

Best regards,

--ken
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2013 World Finalists & Archimedes Division Winners with 33 & 469
2013 & 2012 North Carolina Regional Winners with teams 435 & 4828 and 1311 & 2642
2011, 2010, 2006 Granite State Regional Winners with teams 175 & 176, 1073 & 1058, and 1276 & 133
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Unread 02-02-2008, 07:08
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GaryVoshol GaryVoshol is offline
Cogito ergo arbitro
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Re: Hyper 69 driving video

Quote:
Originally Posted by Wayne Doenges View Post
You are going the wrong way
110 penalty points. Your alliance partners will love you

Quote:
Looks good though
I agree.
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