Quote:
Originally Posted by Jon Stratis
Check the limit switch jumpers in the Jag, and look at the LED on the Jags - they flash status messages when something is wrong.
It sounds like the "reverse" limit switch jumper came out, which will prevent the Jag from going in reverse.
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Good ideas. I also like to use a servo in situations like this to test that the PWM signals are doing what you expect. There could be a problem with the driver station, controls, or code, and you are not really generating any reverse signals. Our team has put together a servo that is self powered so it can plug directly in place of a Jag or Victor to quickly test the signals without the need for a jumper.
In the future you may also want to consider building or buying one of the small boards that generate PWM signals if you don't have one. Between having a servo to test the signal out, and a small box that generates a reliable PWM signal you can quickly isolate almost any problem like this.