yes correct. but as for powering the BBB back on you need a bit more there than a user pressing the power button a nice external micro works great. Remember if you have a LIPO battery the BBB will not repower on after power is reapplied.
On 5/16/2016 12:54 PM, Gerald Coley wrote: > Add a a battery or super CAP. When the DC voltage goes away, the > processor gets and interrupt. When SW get interrupt unmount the Flash > and power down. > Invest in a real 5V power supply. > > Gerlad > > On Mon, May 16, 2016 at 2:51 PM, Micka <mickamus...@gmail.com > <mailto:mickamus...@gmail.com>> wrote: > > Gerald what is your opinion on this subject ? > > > Le lun. 16 mai 2016 21:46, evilwulfie <evilwul...@gmail.com > <mailto:evilwul...@gmail.com>> a écrit : > > spend 50 bux on a power supply to solve a 5 dollar problem > yeah right. > > > > On 5/16/2016 12:34 PM, John Syne wrote: >> >>> On May 15, 2016, at 4:25 PM, evilwulfie >>> <evilwul...@gmail.com <mailto:evilwul...@gmail.com>> wrote: >>> >>> msp430 has an internal watchdog >> And so does the AM3358, so I’m not sure whats your point? If >> it is a micro-controller, it is not guaranteed to boot up >> successfully every time, given an unstable power supply. To >> start with, you need to make the power supply more >> predictable so that brown outs, dips and sags are not seen by >> the micro-controller and that power down only occurs if the >> input power fails for more than a specified time. Also, if >> you do start a shutdown, then a full power cycle is needed in >> a controlled manner. When input power returns, don’t boot >> until the input power looks reliable. >> >> This is where you need an understanding of how the power >> utility network operates, which includes understanding how >> protection operates, what an ARC (Automatic Reclosure Relays) >> do, etc. For example, when a large breaker trips due to a >> protective signal, the ARC will attempt to reclose that >> breaker, sometimes more than once. At night, in a storm, you >> will see your lights dim for a second or two; that is an ARC >> operation. When a transformer has water in the oil or when a >> insulator is arching, or a power line is arching on the >> ground, these all result in very strange power behavior. In >> summary, power failure isn’t just an on or off problem, but a >> multitude of more problematic cases. >> >> Regards, >> John >>> >>> On 5/15/2016 3:37 PM, John Syne wrote: >>>> >>>>> On May 15, 2016, at 3:14 PM, evilwulfie >>>>> <evilwul...@gmail.com <mailto:evilwul...@gmail.com>> wrote: >>>>> >>>>> We use an external msp430 for our intelligent watchdog >>>> So who or what monitors the MSP430? Since it is a >>>> micro-controller, it is easy to get it into a lock >>>> situation. All you need is a programable power supply which >>>> will ramp up and down the voltage into the micro-controller >>>> at predefined times and it will lock and become completely >>>> unresponsive. Granted this will rarely happen, but in our >>>> applications where 100K or more devices are installed, we >>>> cannot accept some devices locking up because of a power >>>> failure. >>>> >>>> Regards, >>>> John >>>>> >>>>> >>>>> On 5/15/2016 1:07 PM, Super Twang wrote: >>>>>> >>>>>> >>>>>> I've just come across this conversation in my own search >>>>>> for a rock-solid, embeddable configuration for the >>>>>> BeagleBone Black. I’m trying to develop an embedded >>>>>> controller device that needs to live behind walls, in >>>>>> ceilings and in other inaccessible places. ( It is for >>>>>> the automation of art & other electronic installations.) >>>>>> >>>>>> From what I gather here, the BBB is not quite up to the >>>>>> task, without an external watchdog circuit (please >>>>>> correct me if I’m misreading this thread). >>>>>> >>>>>> @John3909: Your suggestion of the GreenPak prompted my >>>>>> own discovery of that tech — it looks great, esp the >>>>>> ecosystem of tools around the platform. >>>>>> >>>>>> In looking around, I found some Silego application notes >>>>>> that implement a hardware watchdog for MCUs. >>>>>> http://www.silego.com/products/352/312/AN-1058.html >>>>>> This might be a useful starting point for anyone using >>>>>> GreenPak for a hardware watchdog. >>>>>> >>>>>> @John3909: Does this design look like it might be a good >>>>>> fit for the BBB? (Not knowing how to read GreenPak >>>>>> internals, it is not obvious to me) >>>>>> >>>>>> Alternately, I'm wondering in the two years that have >>>>>> passed since this thread started, if anyone has developed >>>>>> a hardware watchdog design for the BBB they'd be willing >>>>>> to share. An open-source hardware watchdog for the BBB >>>>>> would go a long way towards ameliorating the hardware >>>>>> issues with the PMIC on RevC, and allow it to prosper as >>>>>> a base for applications where long-term reliability matters. >>>>>> >>>>>> Although I’m first and foremost a software engineer, I've >>>>>> got some electronics chops (albeit mostly digital), but >>>>>> (sadly) very limited hardware design equipment >>>>>> (oscilloscope, etc). [That said, I have iron, and will >>>>>> solder!] I’d be happy to develop & contribute the >>>>>> software components for such a system (I’d envision a >>>>>> library + device tree overlay) if someone(s) else would >>>>>> like to partner up to design the hardware side. >>>>>> >>>>>> Best, >>>>>> >>>>>> ST >>>>>> >>>>>> -- >>>>>> 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 >>>>>> <mailto:beagleboard+unsubscr...@googlegroups.com>. >>>>>> To view this discussion on the web visit >>>>>> >>>>>> https://groups.google.com/d/msgid/beagleboard/c7fb39d8-84ef-4127-9db8-cd65a6965e31%40googlegroups.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 >>>>> <mailto:beagleboard+unsubscr...@googlegroups.com>. >>>>> To view this discussion on the web visit >>>>> >>>>> https://groups.google.com/d/msgid/beagleboard/976bd440-2729-5157-8692-3357a8d607a0%40gmail.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 >>>> <mailto:beagleboard+unsubscr...@googlegroups.com>. >>>> To view this discussion on the web visit >>>> >>>> https://groups.google.com/d/msgid/beagleboard/E00049D5-E39B-42CB-8A5E-A19F4E51199F%40gmail.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 >>> <mailto:beagleboard+unsubscr...@googlegroups.com>. >>> To view this discussion on the web visit >>> >>> https://groups.google.com/d/msgid/beagleboard/300489a5-a027-8f30-a598-89be5b17b4a4%40gmail.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 >> <mailto:beagleboard+unsubscr...@googlegroups.com>. >> To view this discussion on the web visit >> >> https://groups.google.com/d/msgid/beagleboard/7BFABDDC-D4D0-4E6F-863C-1015E9794658%40gmail.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 > <mailto:beagleboard+unsubscr...@googlegroups.com>. > To view this discussion on the web visit > > https://groups.google.com/d/msgid/beagleboard/4b8c4f6e-abae-446c-d964-26d37b92d4b3%40gmail.com > > <https://groups.google.com/d/msgid/beagleboard/4b8c4f6e-abae-446c-d964-26d37b92d4b3%40gmail.com?utm_medium=email&utm_source=footer>. > For more options, visit https://groups.google.com/d/optout. > > > > > -- > Gerald > > ger...@beagleboard.org <mailto:ger...@beagleboard.org> > http://beagleboard.org/ > gcol...@emprodesign.com <mailto:gcol...@emprodesign.com> > > -- > 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 > <mailto:beagleboard+unsubscr...@googlegroups.com>. > To view this discussion on the web visit > https://groups.google.com/d/msgid/beagleboard/CAHK_S%2Bc4Y%3DCzkntAm-Upc7pQmp70_2d5FLb%3D70TtLxtE%3DxObqA%40mail.gmail.com > <https://groups.google.com/d/msgid/beagleboard/CAHK_S%2Bc4Y%3DCzkntAm-Upc7pQmp70_2d5FLb%3D70TtLxtE%3DxObqA%40mail.gmail.com?utm_medium=email&utm_source=footer>. > For more options, visit https://groups.google.com/d/optout. -- For more options, visit 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