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Unread 20-02-2010, 11:53
Unsung FIRST Hero
Al Skierkiewicz Al Skierkiewicz is offline
Broadcast Eng/Chief Robot Inspector
AKA: Big Al WFFA 2005
FRC #0111 (WildStang)
Team Role: Engineer
 
Join Date: Jun 2001
Rookie Year: 1996
Location: Wheeling, IL
Posts: 10,795
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Re: Weirdest issue with our robot!

Andy,
The Crio goes into protect when the battery voltage falls below 5.5 volts for some length of time. You can get a little insight to this if you watch the voltage reading on the drivers station. Voltage samples are not continuous but if you notice voltage running up and down in turns and getting as low as say 7 or 8 volts, the dips are likely much lower. Reboot of the Crio can take place if the battery voltage should dip to around 4.5 volts at which time the 24 volt regulator in the PD starts to cut out. You know how long the Crio takes to boot so this is a risky issue for competition. Tank turns with high friction drives and wheels, cause CIM motors to draw near stall current. That is 129 amps per motor.
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Good Luck All. Learn something new, everyday!
Al
WB9UVJ
www.wildstang.org
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Storming the Tower since 1996.