BMM350 D.D TEST error

hello

By combining BHI360 and BMM350, only the BMM350 function is being used.

We confirmed that the graph changes when a magnetic object approaches the board.

What I'm curious about is this.
1. After bringing the magnetic material close to the board and observing the graph phenomenon, the magnetic material was moved away from the board.
It is normal for the graph to return to its initial state, but I am curious as to why it does not return. (A photo is attached.)

Photo 1. normal

normal

Photo 2. error

error

Best reply by BSTRobin

Hi kyusanglee,

Thanks for your inquiry.
When you bring the magnetic material close to the board and move the magnetic material away from the board. You need to shake the board to get a normal graph . Because BHI360's built-in FMC magnetic calibration algorithm performs magnetic calibration on BMM350 based on data from gyroscope sensor. After you shake the board, the magnetic field will be recalibrated.

BMM350 data before recalibration:

BMM350 data after recalibration:

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