[kinganu123]

Originally Posted by Alan Anderson

What does "properly grounded" mean to you? Absolutely nothing should be electrically connected to the frame of the robot, either accidentally or intentionally.

well, everything is mounted on wood and whatever isn't used isn't connected to the PD board
Furthermore, we put a multimeter to the frame and got a reading of 0.0

Originally Posted by Ninja_Bait

However, since all the wheels work independently and the bot only crashes when they all drive backwards, I'd say it's safe to blame code. I can't think of any other reason that would cause the bot to act like that.

I'm starting to think that too, but motorsafety isn't throwing any errors and everythings SEEMS to be fine in terms of code. all it is is creating a robotdrive, joystick, and driving via inputs from joystick

Originally Posted by ratdude747

What speed controllers? if victors, are they calibrated right?

if jags, PWM, serial CAN, or 2CAN?

also, if known, what programming language?

Victors
what do you mean by "calibrated right"
and we are using Java

Originally Posted by Al Skierkiewicz

King,
Jaguars (old Tan color) were notorious for failing in one direction that year. When you say that the robot stops functioning, are you saying that the Crio reboots or the robot simply will not go in reverse? Are you using dual motor transmissions? If so are you absolutely sure of the wiring to each motor? It is possible that one of the motors is wired backwards. When you reverse you suddenly add a short (both motors go into stall) drawing upwards of 200 amps. Although unlikely, it is possible for the motors to be able to drive in one direction but not at full speed. Of course if you add a defective Jag that is open in forward but functions normally in reverse, this result is possible. I suggest you remove the wiring to one motor on each side and see if the robot moves in both directions. Note which direction the wheels turn for a forward movement on the joysticks. Then swap motors on both sides and try again. Do the motors cause the same direction of movement as the first test? I have also seen debris in a transmission that allows movement in one direction but locks the transmission in the other direction. You should be able to simulate this without power, moving the robot by hand.

we are using Victors and i THINK single transmissions
the cRIO doesn't reboot upon failing
i'll check everything else you've said, thanks!

Originally Posted by vhcook

Did you test on the floor or on blocks (or both)?

Both

Originally Posted by mesamb1

You said you can spin. With the mecanum wheels that sounds like the wheels can spin backwards, but not when the joystick tells it to go backwards. I would think code, but there could be a joystick short

can't be the joystick because we tried our xbox and an older joystick

Originally Posted by LemmingBot

Check the C-rio, we just had a problem with our 2011 bot that sounds alot like yours, we think that it was a combination of inflicted damage and a slightly defective unit. Try swapping the rio out with a different one and see if that fixes it.

its a relatively new cRIO (we bought it a while ago, but it was only for show on a testboard that we later stripped), but I'll have the team replace it