Pololu forum user Camel recently posted the Quaternion-based AHRS using AltIMU-10 & Arduino. This is an Arduino program that can read data from our AltIMU-10 sensor board, compute the orientation of the board, and output it over serial. It uses quaternions internally to represent the rotation, but can output Euler anglers, a rotation matrix, or a quaternion. The MinIMU-9 v2 is just an AltIMU-10 without a pressure sensor, so the code can be made to work with a MinIMU-9 v2 by commenting out a few lines.
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