Hello, I am looking at using the BNO055 IMU to obtain heading in NDOF mode and am curious how auto calibration works. Is auto calibration writing its values on a regular basis (i.e. every minute) or is it triggered by events? How does it know to write to the offsets in the registers? How often would this be done? I understand auto calibration cannot be disabled, but I was wondering if there was some sort of way to work around this. Is it possible to write to the calibration offset registers at a regular basis to prevent auto calibration or perhaps be able to restore the desired calibration offset? The reason I am concerned about auto calibration is because I plan to use the IMU fixed on a moving vehicle. Once it is mounted it would be impossible to go through the initial calibration procedure. The best I could do would be to drive the vehicle in figure-eights. Any thoughts or feedback would be greatly appreciated. Cheers, Laura
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Hello, We are trying to use the BNO055 for accurate heading (±2 degrees). We want to use the device permanently mounted on a 3-meter mast that extends from a heavy hard iron vehicle. It is important for us to be able to calibrate the device once and store the offset values between power-ons. We intend to initially calibrate it in place on the mast by driving the vehicle around in figure eights. We intend to configure the device in fusion mode. Is there a specific mode that you would recommend for stable and accurate heading? Is there a way to disable auto calibration once the initial offsets are stored? Secondarily, will the sensitivity of the magnetometer be such that the heading would be significantly perturbed by passing vehicles or other metallic interferences? Finally, is there an alternative device such as the BNO080 that would be more appropriate for our application? Thank you.
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