BNO055 calibration

[boardarch]

I'm looking at using the BNO055 sensor for measuring the angles towards gavitation in an industrial applciation, no absolute north/south orientation is needed.

Calibration after power on is undesierable, or even probably impossible. So my take is to calibrate once at installation, then store the calibration values and write them back after power on. I havent really understood if that is possible through the documentation. Is it possible to write back calibration data after power on and have the internal fusion algorithms to move to the calibrated state and start calculating absolut orientation angels?

Best, Anders

[o_o]

Hi boardarch,

That's a very nice target ! Unfortunately I do not know of any consumer grade accelerometer which can achieve this kind of accuracy, especially over a wide temperature range. The BNO055 has built-in calibration which can typically keep the pitch and roll error <2 degrees.

This is an order of magnitude higher than your requirement. With good mechanical design and smart calibration routine (not automatic like the BNO055), <0.5 degrees can be achieved at room temperature, but would require periodic manual recalibration.

https://community.bosch-sensortec.com/t5/Knowledge-base/BMA4xy-accelerometer-series-design-guide/ta-...

o_o