Hi Sir:     For a new sensor,  it need constant work more than 8 hours in LP mode to achieve a relative stable and reliable detection of air quality changes,  and if the more better performance  you want to get, the sensor need constant work more than 7 days.    And then if sensor is placed in a stable enviromental condition, which means the constant temperature/humidity/air compositon etc., you are able to get a relative stable resistance value.   ... View more

Hi Sir:       IMU plus mode only use ACC and GYRO, output the relative orientation, so after power down with any angle values and power on again, 0 degree in heading information will be got regardless to calibrate or not.       I checked the heading values in NDOF mode by my demo board, after power down at any angle values and power on again 0 degree in heading information will be got if BNO055 is not calibrated. But after calibrate, the heading values will be similar to or the same as the values that are before power off if place the same as previous positon.      So recommand you to check the heading information after calibrate. And you also can check your raw data to compare with previous data and look into the difference.          ... View more

Hi Sir:      What is the calibration status  of BNO055 especially in NDOF mode?      Before get the reliable heading value, you should confirm the sensor accurcay, include acc/gyro/mag/system accuracy.   ... View more

Hi Sir:      Could you let me konw your platform is 64-bit system or 32-bit system? ... View more