Keyestudio KS4028 Manual page 143

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Micro: Bit main board uses LSM303AGR geomagnetic sensor, which
supports four modes namely 100 kHz,400 kHz,1 MHz and 3.4 MHz and the
dynamic range of magnetic field is ±50 gauss.
In the board, the magnetometer module is used in both magnetic
detection and compass. In this experiment, the compass will be introduced
first, and then the original data of the magnetometer will be checked.The
main component of a common compass is a magnetic needle, which can
be rotated by the geomagnetic field and point toward the geomagnetic
North Pole (which is near the geographic South Pole) to determine
direction.
Attention: this geomagnetic sensor built in the board can help us
determine bearings by showing readings in the value from 0 to 360. And
the system will ask us to calibrate it the first time it is put into operation by
rotating the board.Please note that metal materials around may attenuate
the accuracy of the reading and calibration.
(2)Components Needed:
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