BNO055 - How to extract higher-level orientation from quaternion

[just_testing]

I'm using the BNO055 IMU to obtain fused sensor data in the form of the quaternion. I'd like to use the orientation as part of a classification model, however, I don't need as precise of an orientation description as the quaternion itself gives. Basically, I want to map the quaternion output to some higher-level classes for example facing forward, facing left, etc.. (or something of this sort). I'm unsure of how to go about going this mapping and I'm wondering if anyone here has done something similar and could provide some insight on the problem? Thanks

[BSTRobin]

Hi just_testing,

According to the placement position of your sensor, you can judge the direction of the sensor in the following two ways:
1. Use Euler angle;
2. Judge the direction by the values of over acceleration x, y and Z.