From: William Hermans <yyrk...@gmail.com> Reply-To: <beagleboard@googlegroups.com> Date: Tuesday, March 25, 2014 at 3:41 PM To: <beagleboard@googlegroups.com> Subject: Re: [beagleboard] Hardware watchdog for BBB
> Yeah after I thought about it, after making my post I realized I did not > include a way to bring the BBB back up. > > For bringing the BBB back up after input power is back up I suppose I would > use an MSP430 to monitor the input power, and a "keep alive" signal from the > BBB to the MSP430. A Value line MSP430 such as the MSP430G2553 is low cost ( > ~$2.5 in quantities of 1 ) can run off a single button cell for years. the > MSP430G2553 also has SPI, I2C, GPIO's, and UART, as well as a few other > niceties( hardware WDT, and Timer(s).) > > So perhaps more complex than I originally led on, but perfectly doable, and > not really all that complex. Just off the top of my head, I would use either a > regular timer, or perhaps even use the hardware watchdog timer to cycle a > reset on the BBB through a GPIO. With the keep alive signal being sent out > over either SPI or UART. > > Is this on track with what you had in mind, or are you thinking of something > else, or is this too complex for your application ? Hi William, I like your solution. I used a GreenPak from http://www.silego.com/ which are really low cost $0.35 in small quantities. They are tiny (about 2mm square) and very robust; no need for WDT. Also, they work down to 1.8V, which is required when working with supercaps. Regards, John > > > > On Tue, Mar 25, 2014 at 12:50 PM, John Syn <john3...@gmail.com> wrote: >> >> From: Timbo <tim...@gmail.com> >> Reply-To: <beagleboard@googlegroups.com> >> Date: Tuesday, March 25, 2014 at 6:12 AM >> >> To: <beagleboard@googlegroups.com> >> Subject: Re: [beagleboard] Hardware watchdog for BBB >> >>> >>>> What happens when you have 10K, 100K or even 1 Million devices running. >>> >>> Now we know where all the BBBs went! >> Very funny. BBB wouldn¹t work for my application but I do draw from Gerald¹s >> brilliance ;-) >>> >>> >>> For home use I've rigged two BBBs together so that each can monitor and >>> reset the other. Every 5 minutes each board tries to send itself a message >>> via an ssh connection to the other board. If it fails to receive that >>> message, it assumes the other board has crashed somehow and sends a reset. >>> If it still fails to get a response it carries out a power cycle. >>> >>> In conjunction with a simple UPS such as the OP describes, this would >>> probably be enough for normal use. >>> >>> >>> -- >>> 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. >> -- >> 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. > > > -- > 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. -- 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.
