On Wed, 25 Feb 2015 15:51:21 -0800 (PST), you wrote: >Yes indeed, and that is a perfect way to shut down our baby. It's another >way of pressing the power button. Thing is you need another 10 sec. of >shutdown power (to cleanly shutdown).
That's possible with a backup supply, NIMH/NICD with a resistor to charge and a diode to prevent overcharge, if you have a cutoff when the batteries reach 1.1 volts, you're fine. I'd suggest a 1 farad capacitor, but the BBB wants several hundred mills when running, and I suspect that's a bit much. > >So I'm looking for the use case where somebody stupid (talking 'bout me) >yanks the 5V and I still get a clean shutdown. We need external 'ups' power >for that last 10 sec. of shutdown. Now I keep 5V always on. Till power >company screws up. 64 million dollar question: how many times can power >company screw up before bbb screws up? Ok, comparator and you shut down (gracefully) when the DC power goes away. Problem is to determine that (if you're also battery powered.... this is good....) > >Question remains why I get a unclean shutdow with me (the stupid one) >feeding 5v to otg usb with powerbar and getting clean shutdown when >connected to regular pc. May have to do with how the power is actually disconnected, clean off vs make/break/make/break by disconnecting > >Call me stupid but the correct answer awaits tickets for the next frank >zappa concert! *or is that a *sears* poncho?* Harvey > >thx, >Michiel -- 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 beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
