It won’t be EMC related as the BBB PCB layout is pretty good and isn’t susceptible to lightning. My guess would be related to power flowing across the board. To prevent this, don’t use more than one ground connection between the BBB and your other circuits. Preferably, use the pins closest to the 5V power socket. Use opto isolators were ever possible. To test this, use a Taser gun approximately 1 meter (3 feet) away.
Regards, John > On Jul 3, 2016, at 9:12 AM, William Hermans <[email protected]> wrote: > > Thanks for the info about the input voltage sensitivity of the Beaglebone, > good chance this is the real issue, especially as there was a good chance for > "ground bounce" between different parts of the system from my mistake in > powering one of the PIR sensors off the "wrong" UPS. Time will tell. If it > happens again now that I've corrected that mistake, I'll look into powering > the BB with a better supply, and/or look into adding the backup battery > option. > > If the cause is in fact ESD somehow triggering the Beaglebone reset. Adding a > battery won't help unless you remove the acpid package. However I will add > that pressing the power button, and input voltage going away both fire the > same interrupt. So if it was power momentarily dipping below the 5v > threshold. Adding a battery should fix that. Do note, though unless you want > your board to power down immediately, you'll want to remove the acpid package > . . . > > So, just to be 100% clear. the acpid package ( service ) triggers both button > press, and 5v input voltage shutdowns. Remove it, and neither should be > triggered afterwards. > > On Sun, Jul 3, 2016 at 8:13 AM, Wally Bkg <[email protected] > <mailto:[email protected]>> wrote: > Thanks for the info about the input voltage sensitivity of the Beaglebone, > good chance this is the real issue, especially as there was a good chance for > "ground bounce" between different parts of the system from my mistake in > powering one of the PIR sensors off the "wrong" UPS. Time will tell. If it > happens again now that I've corrected that mistake, I'll look into powering > the BB with a better supply, and/or look into adding the backup battery > option. > > Due to the location, shielding the BB in a metal box is way too invasive to > try. Since the RPi2 has had no issues either time I consider the evidence > that shielding would help to be shaky at best. > > I got it booted again by unplugging the BB wal-wart 5V supply and plugging it > back in. As a last resort I can add a watchdog and relay to interrupt the BB > power and re-apply it after ~30 seconds. > > -- > For more options, visit http://beagleboard.org/discuss > <http://beagleboard.org/discuss> > --- > You received this message because you are subscribed to the Google Groups > "BeagleBoard" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected] > <mailto:beagleboard%[email protected]>. > To view this discussion on the web visit > https://groups.google.com/d/msgid/beagleboard/023e9e06-2c70-4980-a197-ed9435c7a90c%40googlegroups.com > > <https://groups.google.com/d/msgid/beagleboard/023e9e06-2c70-4980-a197-ed9435c7a90c%40googlegroups.com>. > For more options, visit https://groups.google.com/d/optout > <https://groups.google.com/d/optout>. > > > -- > For more options, visit http://beagleboard.org/discuss > <http://beagleboard.org/discuss> > --- > You received this message because you are subscribed to the Google Groups > "BeagleBoard" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected] > <mailto:[email protected]>. > To view this discussion on the web visit > https://groups.google.com/d/msgid/beagleboard/CALHSORrdSAFGvf%2Bzkf0K7mkR-G4rWWc1-4rvArjU%3DeOHDJwP9A%40mail.gmail.com > > <https://groups.google.com/d/msgid/beagleboard/CALHSORrdSAFGvf%2Bzkf0K7mkR-G4rWWc1-4rvArjU%3DeOHDJwP9A%40mail.gmail.com?utm_medium=email&utm_source=footer>. > For more options, visit https://groups.google.com/d/optout > <https://groups.google.com/d/optout>. -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/64E76A05-354B-4562-BA50-6274940FF3CE%40gmail.com. For more options, visit https://groups.google.com/d/optout.
