I've come into an existing design that uses a 2D accelerometer chip to measure a board's rotation angle around a shaft. The board is attached to a motor that drives a gearbox that rotates the shaft, so the motor and board rotate with the shaft. Deriving the angle and calibration of this device is quite complex, is there a simple part out there that say has a high level serial interface that can just tell me the rotation angle? Desired accuracy would be < 1 degree. It's for a solar tracking application so angles are between -85 and 85 degrees, speed of rotation is quite slow.
Thanks if anyone can help, Fred