In APM (ArduPlane/ ArduCopter) with/ without Mission Planner, we can observe that when the board is titled down, pitch angle changes from 0 (horizontal position), to 90 (vertically pointing downward), and tilting it further brings/decreases it back to 0 in the reverse position.
See figure, you will understand my point. How do I distinguish any two same angle readings (which basically look alike but the board has different orientation). I am sure, other have faced this too. I need to do some processing with these angles, and important for me to know which angle (85 deg) orientation the board is really in, the processing get confused due to not handling this scenario.
Looking for a quick solution to tackle this. Thank you!