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iSpindle: Calculation methodology

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philmurp

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Hello all.

I have been trying to replicate the iSpindle "Tilt" calculation. At this link:https://github.com/universam1/iSpindel

I have an accelerometer at home that I can calculate the "pitch" and "roll" but not sure what methodology is used to get the single "tilt" value.

Something like this link seems like it would work; but I am not sure how iSpindle does it.
https://math.stackexchange.com/ques...otation-from-pitch-and-roll-yaw-is-fixed-to-0

Any help is great; I am planning on ordering parts soon; and would like to use my existing accelerometer instead of buying a new MPU6050 if possible. I have been looking through a lot of the github documentation but can't find the exact calculations.
 
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