I connected a 6v 5amp battery and it broke my bricked my pocket beagle. On Thursday, November 22, 2018 at 6:23:51 PM UTC+2 fek...@gmail.com wrote:
> Hello, I had to put the charging project on hold but will pick it up again > soon. I probably blocked excessively on finding an acceptable 10K NTC > thermistor with the right B= value. > > On Tue, Nov 20, 2018 at 9:25 AM Jason Kridner <jkri...@gmail.com> wrote: > >> On Thursday, September 6, 2018 at 10:22:38 AM UTC-4, Fred Kerr wrote: >>> >>> I am concerned about the battery temperature for safety in my office, >>> house, and around my 4-year-old son. :) And I'm curious about logging stuff >>> infinitum. >>> >>> I have it working with a fixed resistor (without attempting charging >>> yet). >>> >> >> Did you ever get your thermistor working and enable charging? >> >> > On Thu, Sep 6, 2018 at 7:18 AM Graham Haddock wrote: >>> >> Fred: >>>> The temperature coefficient is only important if you are going to use >>>> them as temperature monitors, and you are going to thermally/mechanically >>>> attach them to the battery. >>>> >>>> If you are just trying to get the battery power supply to run, and are >>>> not concerned about battery temperatures, a fixed resistor will work fine. >>>> >>>> --- Graham >>>> >>>> == >>>> >>>> On Thu, Sep 6, 2018 at 3:34 AM Fred Kerr wrote: >>>> >>> I am looking for 10K NTC Thermistors with B=3480. How critical is the B >>>>> value, or what range can I accept? Currently I am looking on Mouser. >>>>> >>>>> Is there a specific or recommended battery pack? I'm just using an >>>>> 18650 from a local surplus store. >>>>> >>>>> Regarding the log file, I still need to do this: >>>>> >>>>> sudo /opt/scripts/tools/developers/update_bootloader.sh >>>>> >>>>> I'll also look for 100K thermistor with B=3960 >>>>> >>>> >>>>> On Thursday, August 30, 2018 at 5:35:43 PM UTC-7, Fred Kerr wrote: >>>>> >>>> It runs well with the soldered implementation. My breadboards are a >>>>>> little cheap. >>>>>> >>>>>> The attached minicom_20180830b.cap shows a boot with microUSB power >>>>>> from a wall wart (from my rpi3), then a boot with the battery circuit. I >>>>>> left both RX and TX attached; I'll play with disconnecting them another >>>>>> time. >>>>>> >>>>>> I'll look into getting some "telemetry" info from the pocket beagle. >>>>>> I'm open to suggestions about things to add/log, etc. Also, I think this >>>>>> pocket beagle doesn't have a fix that I got before - after the shutdown, >>>>>> things panic. >>>>>> >>>>>> If anything else jumps out from the log file, please let me know! >>>>>> >>>>> >>>>>> On Wednesday, August 29, 2018 at 10:59:03 AM UTC-7, Fred Kerr wrote: >>>>>> >>>>> I'll try again soon with my more stable circuit (*soldered), also with >>>>>>> RX disconnected so I just get output from the Pocket Beagle and the >>>>>>> only >>>>>>> power input is from the battery circuit. >>>>>>> >>>>>>> (*Soldered, so no loose breadboard connections, better current >>>>>>> carrying capacity, etc.) >>>>>>> >>>>>>> What is a good way to share log files? Mine can get verbose! I could >>>>>>> store it somewhere and post a link - suggestions welcomed! I have a lot >>>>>>> of >>>>>>> possibilities, but just let me know what works best for you. >>>>>>> >>>>>>> On Tuesday, August 28, 2018 at 12:51:23 PM UTC-7, Fred Kerr wrote: >>>>>>> >>>>>> Yes, it ran quite a lot longer on the 1F, but still hung. >>>>>>>> >>>>>>>> I wired this up (see pic) to be more stable than the breadboard >>>>>>>> mess I had. The led on 1.8k resistor is gonna run a lot longer than >>>>>>>> I'll >>>>>>>> take at lunch!!! >>>>>>>> >>>>>>>> Can I isolate RX and TX or...oh I just need TX from the beagle for >>>>>>>> visibility! >>>>>>>> >>>>>>>> 1F 5.5v supercap (that battery was discharged to 3.96v). This one >>>>>>>> has more charge. Also put a 1000uf electrolytic on the soldered >>>>>>>> version, >>>>>>>> "because". >>>>>>>> >>>>>>>> Fred Kerr (mobile) >>>>>>>> >>>>>>>> On Tue, Aug 28, 2018, 12:13 PM Jason Kridner wrote: >>>>>>>> >>>>>>> >>>>>>>>> >>>>>>>>> On Monday, August 27, 2018 at 11:15:36 PM UTC-4, Fred Kerr wrote: >>>>>>>>>> >>>>>>>>>> Hello all, >>>>>>>>>> >>>>>>>>>> I'm being just a little bit careful here: >>>>>>>>>> >>>>>>>>>> I'm about to try this, but I will connect up the serial terminal >>>>>>>>>> first, so I can see output and interact with the board. (Graceful >>>>>>>>>> shutdown!) >>>>>>>>>> >>>>>>>>> >>>>>>>>> Don't connect the power or RX (ie., serial cable to PocketBeagle) >>>>>>>>> signals to avoid them interfering. Great thing to monitor. >>>>>>>>> >>>>>>>>> >>>>>>>>>> >>>>>>>>>> I will test the serial connection first with just a micro USB >>>>>>>>>> charging cable rather than USB to a computer. (Simplify!) >>>>>>>>>> >>>>>>>>> >>>>>>>>> Not sure what you are testing here. Are you just saying you'll >>>>>>>>> power via the microUSB connection and not connect to a computer, just >>>>>>>>> to >>>>>>>>> see the behavior? You are monitoring with a serial connection? >>>>>>>>> >>>>>>>>> >>>>>>>>>> >>>>>>>>>> It's my understanding that LiPo charging is disabled or not >>>>>>>>>> present in the firmware. (I'll give you the "uname -a" and other >>>>>>>>>> info the >>>>>>>>>> next time I fire it up. Just let me know what and how to check.) >>>>>>>>>> >>>>>>>>> >>>>>>>>> It is not enabled by default. There is a flag in the PMIC that >>>>>>>>> needs to be enabled. We've been playing with a driver to set the >>>>>>>>> flag, but >>>>>>>>> there are other bugs in that driver not related to actually charging. >>>>>>>>> >>>>>>>>> >>>>>>>>>> >>>>>>>>>> Also, it's not clear (without reading the data sheet :) ) about >>>>>>>>>> the resistor values for the thermistor and the parallel >>>>>>>>>> (linearizing?) >>>>>>>>>> resistor. >>>>>>>>>> >>>>>>>>>> If you have a 10K thermistor, do you put it in parallel with a >>>>>>>>>> 10K resistor, or likewise 100K thermistor in parallel with a 100K >>>>>>>>>> resistor? >>>>>>>>>> Do you put the thermistor anywhere in contact with the (e.g., 18650) >>>>>>>>>> LiPo? >>>>>>>>>> >>>>>>>>> >>>>>>>>> Looking at the TPS65217 datasheet says to put a 75kohm resistor in >>>>>>>>> parallel. >>>>>>>>> >>>>>>>>> I'm not sure, but I believe the actual thermal resistor should be >>>>>>>>> something like >>>>>>>>> https://www.ametherm.com/blog/thermistors/thermistors-ntc-thermistor-temperature-sensors-provide-li-ion-battery-safety/ >>>>>>>>> . >>>>>>>>> >>>>>>>>> >>>>>>>>>> >>>>>>>>>> From the prior thread, it seems to be sufficient (if even >>>>>>>>>> necessary) just to connect a 10K resistor from TS (P2-16) to ground >>>>>>>>>> (P2-15). >>>>>>>>>> >>>>>>>>> >>>>>>>>> Yes, that is supposed to work, ignoring the battery temperature. >>>>>>>>> >>>>>>>>> >>>>>>>>>> >>>>>>>>>> 10uF cap from battery (P2-14) to ground (P2-15). >>>>>>>>>> >>>>>>>>>> (Tangent/future: What about larger cap, perhaps using a 5.5V >>>>>>>>>> supercap, detect supercap discharging (lipo voltage to ~min input >>>>>>>>>> voltage >>>>>>>>>> on vbat) and give an interrupt to shut the board down?) >>>>>>>>>> >>>>>>>>>> >>>>>>>>>> Thanks in advance for your help, and to the original thread >>>>>>>>>> authors! >>>>>>>>>> >>>>>>>>>> >>>>>>>>>> Other posts that I found: >>>>>>>>>> >>>>>>>>>> Safely power down the PocketBeagle supplied by a battery (no >>>>>>>>>> replies?): >>>>>>>>>> >>>>>>>>>> https://groups.google.com/d/msg/beagleboard/dDSD89DGzpU/j2WzZyA2CgAJ >>>>>>>>>> >>>>>>>>> >>>>>>>>> I threw in a reply. >>>>>>>>> >>>>>>>>> >>>>>>>>>> >>>>>>>>>> >>>>>>>>>> Supplying two ICs from the PocketBeagle powered by a Lipo battery >>>>>>>>>> >>>>>>>>>> https://groups.google.com/d/msg/beagleboard/B7Zyf97hvzY/z8cOt0MHBwAJ >>>>>>>>>> >>>>>>>>>> I want to do some excessive self-telemetry, both internal and >>>>>>>>>> external. I plan to scale the raw battery voltage by 1/11 with an op >>>>>>>>>> amp >>>>>>>>>> before feeding to one of the 1.8V ADC inputs. I'll defer to >>>>>>>>>> suggestions >>>>>>>>>> about measuring current. >>>>>>>>>> >>>>>>>>>> (This is a tangent: I also plan to be paranoid if I connect to a >>>>>>>>>> car and want to monitor the car's "12V" with something like a VCO on >>>>>>>>>> the >>>>>>>>>> car side pulsing to an optoisolator, but I'm sure there are better >>>>>>>>>> ideas >>>>>>>>>> out there! :) (I could use several PIC -> nrf24l01 for some "really >>>>>>>>>> good" >>>>>>>>>> isolation!) >>>>>>>>>> >>>>>>>>>> Thanks, >>>>>>>>>> Fred Kerr >>>>>>>>>> >>>>>>>>>> On Friday, November 10, 2017 at 10:32:46 AM UTC-8, Adam Saenz >>>>>>>>>> wrote: >>>>>>>>>>> >>>>>>>>>>> Keep in mind that the 7V is Absolute Max voltage so you should >>>>>>>>>>> operate below this level or risk damaging the chip. >>>>>>>>>>> >>>>>>>>>>> >>>>>>>>>>> >>>>>>>>>>> On Thursday, November 9, 2017 at 10:15:05 PM UTC-8, Shannon >>>>>>>>>>> Mackey wrote: >>>>>>>>>>>> >>>>>>>>>>>> >>>>>>>>>>>> I expect I'm overlooking something, But it isn't obvious to me >>>>>>>>>>>> how to power the PocketBeagle with batteries. It doesn't have a >>>>>>>>>>>> similar >>>>>>>>>>>> arrangement to BBB. Can someone point me in the right direction, >>>>>>>>>>>> please? >>>>>>>>>>>> Thanks! >>>>>>>>>>>> >>>>>>>>>>>> -- >>>>>>>>> For more options, visit http://beagleboard.org/discuss >>>>>>>>> --- >>>>>>>>> You received this message because you are subscribed to a topic in >>>>>>>>> the Google Groups "BeagleBoard" group. >>>>>>>>> To unsubscribe from this topic, visit >>>>>>>>> https://groups.google.com/d/topic/beagleboard/PQCNhmeBK3M/unsubscribe >>>>>>>>> . >>>>>>>>> >>>>>>>> To unsubscribe from this group and all its topics, send an email to >>>>>>>>> beagleboard...@googlegroups.com. >>>>>>>> >>>>>>>> >>>>>>>>> To view this discussion on the web visit >>>>>>>>> https://groups.google.com/d/msgid/beagleboard/846799d8-d0bf-481a-9599-cd3b97c1b065%40googlegroups.com >>>>>>>>> >>>>>>>>> <https://groups.google.com/d/msgid/beagleboard/846799d8-d0bf-481a-9599-cd3b97c1b065%40googlegroups.com?utm_medium=email&utm_source=footer> >>>>>>>>> . >>>>>>>>> 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...@googlegroups.com. >>>> >>>> >>>>> To view this discussion on the web visit >>>>> https://groups.google.com/d/msgid/beagleboard/84b1f839-cfe2-4dff-b9b3-ecffdc9f2527%40googlegroups.com >>>>> >>>>> <https://groups.google.com/d/msgid/beagleboard/84b1f839-cfe2-4dff-b9b3-ecffdc9f2527%40googlegroups.com?utm_medium=email&utm_source=footer> >>>>> . >>>>> 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 a topic in the >>>> Google Groups "BeagleBoard" group. >>>> To unsubscribe from this topic, visit >>>> https://groups.google.com/d/topic/beagleboard/PQCNhmeBK3M/unsubscribe. >>>> >>> To unsubscribe from this group and all its topics, send an email to >>>> beagleboard...@googlegroups.com. >>> >>> >>>> To view this discussion on the web visit >>>> https://groups.google.com/d/msgid/beagleboard/CANN_KV4icQ5MbPyST%2BSYo_0X9n7_UxudMyCtagT7Oo73qizQ2Q%40mail.gmail.com >>>> >>>> <https://groups.google.com/d/msgid/beagleboard/CANN_KV4icQ5MbPyST%2BSYo_0X9n7_UxudMyCtagT7Oo73qizQ2Q%40mail.gmail.com?utm_medium=email&utm_source=footer> >>>> . >>>> 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 a topic in the >> Google Groups "BeagleBoard" group. >> To unsubscribe from this topic, visit >> https://groups.google.com/d/topic/beagleboard/PQCNhmeBK3M/unsubscribe. >> > To unsubscribe from this group and all its topics, send an email to >> beagleboard...@googlegroups.com. >> To view this discussion on the web visit >> https://groups.google.com/d/msgid/beagleboard/4a0f639c-ea05-4b5e-92e5-f07fadf535e4%40googlegroups.com >> >> <https://groups.google.com/d/msgid/beagleboard/4a0f639c-ea05-4b5e-92e5-f07fadf535e4%40googlegroups.com?utm_medium=email&utm_source=footer> >> . > > >> 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. 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