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Unread 13-05-2011, 05:36
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Jaguars + Vex Microcontroller?

So we at Shaker Robotics are pretty cheap. We want to wire up a drive base using a Vex controller to drive PWM signals since it's much cheaper than another CRIO + DSC. However, all of our Victors are on our competition robot. Since we have tons of Gray Jaguars lying around, and since we're never going to use them on a competition robot, we want to use those instead of Victors on the Vex-driven drive base. Is there any reason this wouldn't work?

My knowledge of electronics is very limited, but as far as I know, PWM is PWM so I don't see why it wouldn't work.
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Unread 13-05-2011, 06:27
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Re: Jaguars + Vex Microcontroller?

I believe that we do this on our Relay for Life robot. I can check when I get to the school today.
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Unread 13-05-2011, 06:56
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Re: Jaguars + Vex Microcontroller?

That is exactly what we did, and it works perfectly fine. We have 2 grey jaguars running through PWM.
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Unread 13-05-2011, 07:31
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Re: Jaguars + Vex Microcontroller?

We have done that. However the jags default code uses a wider pulse than what the vex controller outputs so you will not get full speed. They could be calibrated to give full speed.
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Unread 13-05-2011, 07:47
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Re: Jaguars + Vex Microcontroller?

Quote:
Originally Posted by Gdeaver View Post
We have done that. However the jags default code uses a wider pulse than what the vex controller outputs so you will not get full speed. They could be calibrated to give full speed.
Is it "close enough" to full speed or dramatically less? How would we go about calibrating a Jaguar to work well with Vex?
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Unread 13-05-2011, 08:01
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Re: Jaguars + Vex Microcontroller?

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Originally Posted by Chris is me View Post
How would we go about calibrating a Jaguar to work well with Vex?
See the calibration procedure on Page 13 of the MDL-BDC24 datasheet (attached) or Page 13&14 of the GSG (attached).


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Last edited by Ether : 13-05-2011 at 08:10.
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Unread 13-05-2011, 08:07
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Re: Jaguars + Vex Microcontroller?

Quote:
Originally Posted by Ether View Post
See the calibration procedure on Page 13 of the MDL-BDC24 datasheet.

Something tells me he didn't have to look that up.
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Unread 13-05-2011, 09:31
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Re: Jaguars + Vex Microcontroller?

Quote:
Originally Posted by Chris is me View Post
Is it "close enough" to full speed or dramatically less? How would we go about calibrating a Jaguar to work well with Vex?
Based on PWM pulse widths, it should be about 60%, but I've never tested it.
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Unread 13-05-2011, 10:30
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Re: Jaguars + Vex Microcontroller?

From actual testing with a Jag and a CIM motor it's about 50%. The recalibration procedure is easy to do. When you are done MARK THE JAG THAT IT'S BEEN CHANGED. Otherwise you will have some unhappy FRC / CRIO programmers and electrical team members.
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Unread 13-05-2011, 14:03
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Re: Jaguars + Vex Microcontroller?

it works because we tried it on our 2008 robot, fully operational! its great for a practice robot

Last edited by krudeboy51 : 13-05-2011 at 14:13.
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