I'm sorry for my drawing skills and mistakes in grammar.
I'm trying to solve next task:
Phone is somehow fixed in a phoneholder in a car. As it is displayed on picture. Purple - car coordinate system, red - phone's one.
X - perpendicular to the movement and parallel to the ground
Y - parallel to the movement and to the ground
Z - perpendicular to the ground
During the calibration phase I can assume, that all measured acceleration belongs to single axis - Y. So I have two vectors:
Measured acceleration (ma) - [x, y, z]
Expected acceleration (ea) - [0, |ma|, 0]
How can I calculate rotation matrix, angles or something else I don't know about, to transform measured (phone) acceleration to expected (car)?
