Keyestudio KS4028 Manual page 159

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After uploading the test code 1 to micro:bit main board and powering the
board via the USB cable, if we shake the Micro: Bit main board， no matter at
any direction, the LED dot matrix displays the digit "1".
When it is kept upright （make its logo above the LED dot matrix）, the
number 2 shows.
When it is kept upside down( make its logo below the LED dot matrix) , it
shows as below.
When it is placed still on the desk, showing its front side, the number 4
appears.
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