Hello! Newbie here. Sorry if this question has already been asked/answered. My students are doing the Team Freeze Tag Unit. I showed them how to select the different driver control configurations on the brain. Every so often, a student will bring their robot to me saying that it moves on its own. They are in the driver control program and not a downloaded autonomous program. I usually will turn the robot/controller off and then power them both on again, and it usually stops the problem. Anyone know why this happens and what I can do to prevent it? Or is this just a hiccup in the system? Thanks in advance!
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Typically, this is because the sensitivity for the control sticks has not been set. The brain may register that the control stick is being pressed even when it is not, thus triggering robot movement. To fix this, a deadband can be implemented where the controller only activates the drive train motors if the joystick value is greater than a decided upon number.
Also, the controller may need calibrated.
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Awesome. I’ll give that a try, thanks!
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this is usually due to stick drift and is especially prevelent in vex provided driver control. one thing i used to do was calibrate the controller through the brain. this “calibrats” the joysticks and should work for a good amount of time.
another thing it could be is sticky joysticks. everyonce in a while a controller will have a sticky stick which means that it will not automatically center like it could get stuck in either the down or up position. its alot more common on old vex iq controllers
finally you can have them use a self written driver control in blocks which vex gives awsome examples for that needs some minor changes based on motor ports and directions. but these include a deadband meaning that if the controller is picking up a value les than like 5% it will ignore it.
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Wow, thank you! I appreciate your help!
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Also, in addition to calibrating the joysticks, you may want to check that there is no debris like the bread crumbs are stuck inside, preventing the from returning to zero position. A couple of puffs of the compressed air should help.
And, while you have the air can out, you might just as well clean out all the USB ports and connectors.
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