Thanks a lot for your support! The two tools "Droid Hardware Info" and "phyphox" unfortunately haven't given any new information.
I use a silicon case without any metal on it, but the first thing I tried some days ago was to remove the case nevertheless and take my measures again. But the problem was the same, the sensor always showed around 180 °, independent from the orientation of the smartphone. Also trying to recalibrate without the case doesn't work. My By value seems to be too high, it varies between -240 and -290 µT. Together with the Bx and Bz value this leads to an H value of around 280 - much too high, isn't it? Ken schrieb am Montag, 27. Juni 2022 um 13:44:00 UTC+2: > Hello guys. I am quite familiar with magnetic measurements, compasses in > general. There is a glaring elephant in the room when it comes to using > these sensors on a phone. > > If a phone case or pouch has a magnetic clasp, which many do, the magnets > used will nearly always put the sensors well out of calibration. This can > render them incapable of indicating North and get stuck in the wrong > direction. > > They can easily be recalibrated, by moving the phone at arms length in a > wide figure of right pattern. However simply closing a case or replacing > into a pouch can loose cal again. Currently my phone, a Pixel 2 indicates > North in any direction ! > > For reference earth's magnetic field in the UK is about 45μT. It varies > around the world getting as high as 60 in certain places. Currently my > phone has a total field measurement of 168μT, hugely too high, caused > mainly by one sensor, the Bz. The earth's field is given by > H = square root(Bx^2+By^2+Bz^2) > > Not sure what Maps does regarding calibration, although it's possible it > could handle the sensor data as is and make sense of it. > > Bottom line remove suspect cases and recalibrate > > Hope this is useful. > > Ken > > On Sat, 25 Jun 2022, 17:28 Peter B - pebogufi, <pebo...@gmail.com> wrote: > >> Two more tools to read hardware info: >> + Droid Hardware Info / InkWired >> + phyphox / RWTH Aachen University >> >> clemens...@gmail.com schrieb am Samstag, 25. Juni 2022 um 15:41:23 UTC+2: >> >>> Hi Greg, thank you! I installed SatStat on my old phone, and the Bx By >>> Bz values vary when I change the orientation of the phone, and they are >>> completely different to the values on my new one. >>> >>> I give up. Nevertheless many thanks! >>> >>> Greg Troxel schrieb am Samstag, 25. Juni 2022 um 15:10:12 UTC+2: >>> >>>> >>>> Clemens Jensen <clemens...@gmail.com> writes: >>>> >>>> > I can't interpret the Bx By Bz values. SatStat shows this (pic 1 >>>> phone >>>> > directed to North, pic 2 to East, pic 3 to South, pic 4 to West): >>>> >>>> They are the three components of the magnetic field. That's what the >>>> phone actually measures and from that computes an orientation. I have >>>> no idea where you are, and don't even know the values around me. My >>>> point is that with two phones, I think you should be seeing similar >>>> values. By taking two of them outside away from metal, and orienting >>>> them the same, and seeing the values, and then repeating, you should be >>>> able to gain some insight into whether the problem is the raw >>>> measurements, or something later in the processing chain. >>>> >>>> In your case, with the suspect phone, it looks like all 4 positions >>>> have >>>> similar Bx/By/Bz values. Mine change as I rotate, but not in a way >>>> that's easy to understand. >>>> >>> -- >> > You received this message because you are subscribed to the Google Groups >> "OsmAnd" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to osmand+un...@googlegroups.com. >> > To view this discussion on the web visit >> https://groups.google.com/d/msgid/osmand/9b93ee04-ff71-4e78-bd1d-f1f703a2e470n%40googlegroups.com >> >> <https://groups.google.com/d/msgid/osmand/9b93ee04-ff71-4e78-bd1d-f1f703a2e470n%40googlegroups.com?utm_medium=email&utm_source=footer> >> . >> > -- You received this message because you are subscribed to the Google Groups "OsmAnd" group. To unsubscribe from this group and stop receiving emails from it, send an email to osmand+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/osmand/fd64f790-bbfb-4bd2-8085-ae669a9c9581n%40googlegroups.com.
