Galaxy S3 Compass Incorrect Values

Hmph, spent an afternoon debugging my Galaxy S3 Sensor app since it stopped working, checked all code changes for the last year then checked all the transformations etc. until I realized the compass sensor itself gave invalid values.

As a reminder to myself. Seems that you sometimes need to calibrate it:

  1. Phone
  2. *#0*#
  3. In the test menu press sensors
  4. Immediately start rotating the phone around all its axes until the little compass at the bottom of the screen shows 3.
  5. Then lay it flat on the table and check that it displays the correct values (comparing it with a real compass) while rotating it over 360┬░
  6. If not correct go back to the sensor menu and repeat from 3 onwards.


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