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Unread 18-09-2012, 07:20
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: 10,785
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Re: Communication lost

Quote:
Originally Posted by Flak-Bait View Post
When we drive, our battery voltage drops from about 12.7 to about 9 or 10. Would that be normal, or is that enough to re-boot the cRIO/D-Link? Another thing, with ours, if you leave it for a bit, comm will come back. We've tried different batteries and it happens with all of them.
Brandon,
As Alan said, this is normal. However, short term dips in the battery voltage don't always show up on the dashboard because they are so short. They sometime occur between samples. That being said, the 5 volt regulator that feeds the Dlink will drop out around 7 volts. That is why it must be connected to the boosted +12 volt radio output of the PD. This power supply continues to put out +12 volts until the battery falls to 4.5 volts or less. However, when the Dlink reboots due to low voltage, the reboot time is 50 seconds. If you know exactly how long your outage lasted, we can determine more accurately the exact cause.
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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.

Last edited by Al Skierkiewicz : 18-09-2012 at 19:48.