Projects above all conduct with the built-in sensors and the LED dot matrix
of the main board while the following ones will carry out with the help of
external sensors of this turtle car.
（Attention：to avoid burning the the Micro:bit main board V2, please
remove the USB cable and the external power from the board before
fix it with the shield of the car; likewise, the USB cable and the external
power should be cut from the main board before disconnect the shield
from the board.)
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