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Re: Shutting Down a Robot-Mounted Pi
The issue is not with linux but the SD card. R-Pis have a tendency to bork the SD file system if shut down at the wrong time. I recommend to my students to have a complete clone of the working system SD card, which NEVER goes in a Pi. If the one in the Pi gets corrupted, reclone the master copy on to it, and everything is exactly as it was.
the master is made by taking the latest working pi card and shutting down properly before cloning to master. when doing software updates, have two masters. one is the last working rev, and the other is the current working rev.
Also, faster and more expensive SD cards tend to corrupt less (anecdotally)
Lastly, to answer the OP, I'd send a signal from the roboRio to the Pi at end of match to request a clean shutdown, then it will be powered down by the time you get to your robot during field reset. Most other cases can be covered by the onboard power switch linked to above. You still will have cases of unexpected power loss, but the less often it happens, the better.
knowing how long your electronics take to boot and shutdown nicely is really important.
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Student FRC23 (1996-1999), Mentor FRC246 (2000), Mentor FRC1318 (2007-2009), Mentor FRC93 (2011), Mentor FRC2151 (2012), Mentor FRC23 (2013), Mentor FRC4761 (2014-2017)
1998 - National Chairman's Award and Woodie Flowers Award (FRC23, Mike Bastoni  ) | 2007 - PNW SF (488, 1595) | 2008 - Oregon RCA - Seattle #2 Seed, SF (488, 1696) | 2009 - Oregon #1 Seed, Winners (1983, 2635) - Seattle SF (945, 2865) - Galileo #2 Seed, SF (973, 25) | 2012 Midwest F (111, 71) | 2014 RIDE Winners (78, 125), Inspector - NEU #24, QF (3479, 3958) - NECMP #35 | 2015 Reading #11, SF (1058, 190), Inspector - RIDE #17, QF(4055, 5494), Inspector - NECMP #57 | 2016 Reading #4, SF (133, 4474), DCA, Inspector - Ride #22, SF (1735, 2067), Creativity, Inspector - NECMP #48, RCA - Archimedes
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