On Sunday, July 3, 2016 at 11:13:12 AM UTC-5, William Hermans 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. >
If it happens again, meaning that my power distribution error was not the reason, I'll look into removing the acpid package, as 24/7 operation is the goal, normally it just gets rebooted after software upgrades (my code continues to evolve) via sudo reboot. I'd only want a real shutdown if I was to modify the wiring -- something that is pretty much frozen now that its been mounted in its "permanent" home. Removing acpid package would be the easiest, followed by a better 5V supply. The backup battery is the least appealing as it'll require removing it from its home :( These infrequent events are hard to track down, adding the watchdog to auto power cycle might actually be easier, and more robust in the long run, than adding the battery now that I've looked into how to do that. -- 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/ade8a84a-ed31-4d9f-9c56-97715acabf6b%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
