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Unread 24-03-2009, 09:04
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: possible solution to the static problem

Several things to respond to here.
Drag chains were added and in place in Milwaukee but so was the ample use of staticide spray at all exposed carpet boundaries on the field. As were all regionals that week and beyond. No static issues were reported to me at Boilermaker.
A CRIO showing loss of packets and then a 20 second loss of control is more indicative of a loss of power to the Crio and subsequent reboot than a static issue. As Bob has pointed out, the static issue has been related to the DS which lacks any static protection particularly on the ethernet ports. A power loss during a hard hit with the field or another robot is not uncommon as well as disconnected 37 pin connectors. Although the main breaker is robust, it may not remain connected during a severe shock depending on it's orientation and mounting. The contacts have a relatively low mass but a multi G shock may inject noise or momentary open circuit under this condition.
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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 : 24-03-2009 at 09:25.