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Unread 18-03-2014, 22:32
Fifthparallel Fifthparallel is offline
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AKA: Sam Chen
FRC #1410
 
Join Date: Dec 2012
Rookie Year: 2011
Location: Denver, CO
Posts: 65
Fifthparallel is an unknown quantity at this point
Re: Possible FMS problems.

One thing I've noticed is that this problem seems very particular to the 4 slot cRio and will occur with very secure power connections. I've seen this happen to about 11 robots over the past two years, where the robot will be hit rather hard and will reboot for no apparent reason.

I even troubleshot this with a rookie robot where we discovered that if we dropped the robot (above 1" drop height) while the cRio was relatively not constrained to the robot, the cRio would reboot. Driving the robot at fast speeds and stopping quickly or tugging the wiring in different ways (which would have exacerbated any loose wiring) did not cause the cRio to reboot. However, driving at high speeds into any solid surfaces or getting the robot hit (even with a swift kick to the bumpers...) would cause the cRio to reset based on the force used.

Does the 4 slot cRio have a force-sensitive sensor inside of it that tells it to reset if a threshold is met? This seems much too silly to be the cause, but it seemed too consistent to not be the problem. It was even a problem for Team 1410 at the 2014 Utah Regional, where our cRio reset after hard connects with other robots.
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