Bosch Sensortec Community

    BNO055 losing calibration

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    Community Moderator

    Re: BNO055 losing calibration

    This is not related to the motion speed,  as you said even slow wave will bring magnetic value changes. 

    This means the magnetic sensor is close to a distortion source. 

    What is the material of the boat,  do you have any metal material on boat or like moto etc. 

    Or where you put this boat?  any magnetic distortion source from water to cause magnetic value changes?

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    New Poster

    Re: BNO055 losing calibration

    We have some soft metal (Aluminum) near the IMU but no hard metal.

    In the previuous plot we are moving the boat in order to lose the calibration so the change in the magnetic field is manly due to that.

    As you could see in the first part of the graph, where we are still, the only change in the magnetic field is some spike noise maybe due to the electronic noise.

    Attached is the updated graph with also the gyro data. (for reference the x axis now is in seconds)

     

    Gyro                                                                                                                    Mag

    giroscopio.pngmag2.png

      

     

    Highlighted
    Community Moderator

    Re: BNO055 losing calibration

    From the plotter,  i still can see some big changes in magnetic area. 

    The calibration status loss is not only related how fast the magnetic field change also how big the magnetic data read out changes. 

    The better way is put sensor in a better place without too much hard iron as well as soft iron. 

    If it is not possible,  then a recalibration is always needed to go back to calibration level 3.

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