Android Compass orientation on unreliable (Low pass filter)
- by madsleejensen
Hi all
Im creating an application where i need to position a ImageView depending on the Orientation of the device.
I use the values from a MagneticField and Accelerometer Sensors to calculate the device orientation with
SensorManager.getRotationMatrix(rotationMatrix, null, accelerometerValues, magneticFieldValues)
SensorManager.getOrientation(rotationMatrix, values);
double degrees = Math.toDegrees(values[0]);
My problem is that the positioning of the ImageView is very sensitive to changes in the orientation. Making the imageview constantly jumping around the screen. (because the degrees change)
I read that this can be because my device is close to things that can affect the magneticfield readings. But this is not the only reason it seems.
I tried downloading some applications and found that the "3D compass" application remains extremely steady in its readings, i would like the same behavior in my application.
I read that i can tweak the "noise" of my readings by adding a "Low pass filter", but i have no idea how to implement this (because of my lack of Math).
Im hoping someone can help me creating a more steady reading on my device, Where a little movement to the device wont affect the current orientation.
Right now i do a small
if (Math.abs(lastReadingDegrees - newReadingDegrees) > 1) { updatePosition() }
To filter abit of the noise. But its not working very well :)
