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Make combinations of these blocks:
Note: it is imperative to calibrate the Micro:bit board for different
geomagnetic fields existing in different places. And the system will make
an automatic requirement if it is used for the first time.
(5)Test Result1：
After uploading Test Code 1 to micro:bit main board and powering the
board via the USB cable, and pressing the button A, the board asks us to
calibrate compass and the LED dot matrix shows "TILT TO FILL SCREEN".
Then enter the calibration page. Rotate the board until all 25 red LEDs are
on as shown below.
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