TOHKBD rev2 - Page 182 - maemo.org

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	peterleinchen	2016-06-18 , 06:07
	Posts: 4,118 \| Thanked: 8,901 times \| Joined on Aug 2010 @ Ruhrgebiet, Germany	#1811

Originally Posted by zagrim

Has anyone had issues with the phone compass when using TOHKBD? Static magnetic field shouldn't affect the calibration but in my experience it does.

Yes! (10 chars)

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zagrim	2016-06-19 , 04:44
Posts: 51 \| Thanked: 41 times \| Joined on Feb 2015 @ Mansester, FI	#1812

Originally Posted by rolh

It could be that the magnets in TOHKBD are too strong for the Jolla's magnetometer and cause it to saturate. In that case, calibration doesn't help.

D'oh!
I would be great to somehow verify this (not that it would change the fact but it's good to know for certain), but I guess there's no way to access the magnetometer readings outside of kernel... or is there?

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rolh	2016-06-19 , 06:01
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Originally Posted by zagrim

D'oh!
I would be great to somehow verify this (not that it would change the fact but it's good to know for certain), but I guess there's no way to access the magnetometer readings outside of kernel... or is there?

The sensors should be available in userspace. Have a look at, for example, Messwerk [1], it should allow you to visualize (and log) the sensor data.

[1] https://openrepos.net/content/cfr34k/messwerk

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zagrim	2016-06-20 , 03:49
Posts: 51 \| Thanked: 41 times \| Joined on Feb 2015 @ Mansester, FI	#1814

Thanks @rolh for the tip.

Ok, case confirmed with Messwerk. The readings immediately go to the bottom of the scale (which seems to be around -2 mT) when TOHKBD is attached, and don't move from there regardless of the device position.