> > *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.* > When a battery is connected to the battery test points, this is exactly what happens now when you have the debian package acpid installed( *sudo apt-get install acpid* )
*Invest in a real 5V power supply.* Would you mind elaborating further on what you mean by that Gerald ? Gerlad On Mon, May 16, 2016 at 12:54 PM, Gerald Coley <[email protected]> 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 <[email protected]> wrote: > >> Gerald what is your opinion on this subject ? >> >> >> Le lun. 16 mai 2016 21:46, evilwulfie <[email protected]> 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 < <[email protected]> >>> [email protected]> 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 <[email protected]> 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> >>> 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]> >>> [email protected]. >>> To view this discussion on the web visit >>> <https://groups.google.com/d/msgid/beagleboard/c7fb39d8-84ef-4127-9db8-cd65a6965e31%40googlegroups.com> >>> https://groups.google.com/d/msgid/beagleboard/c7fb39d8-84ef-4127-9db8-cd65a6965e31%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 >>> --- >>> 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]> >>> [email protected]. >>> To view this discussion on the web visit >>> <https://groups.google.com/d/msgid/beagleboard/976bd440-2729-5157-8692-3357a8d607a0%40gmail.com> >>> 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 [email protected]. >>> To view this discussion on the web visit >>> <https://groups.google.com/d/msgid/beagleboard/E00049D5-E39B-42CB-8A5E-A19F4E51199F%40gmail.com> >>> 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 [email protected]. >>> To view this discussion on the web visit >>> <https://groups.google.com/d/msgid/beagleboard/300489a5-a027-8f30-a598-89be5b17b4a4%40gmail.com?utm_medium=email&utm_source=footer> >>> 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 [email protected]. >>> To view this discussion on the web visit >>> <https://groups.google.com/d/msgid/beagleboard/7BFABDDC-D4D0-4E6F-863C-1015E9794658%40gmail.com?utm_medium=email&utm_source=footer> >>> 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 [email protected]. >>> 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 > > [email protected] > http://beagleboard.org/ > [email protected] > > -- > 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/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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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/CALHSORrT-JNkt-7M%2Ba%3DBND%3DFZjGS7Hspowj9bNigfE74zhMSPw%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
