Keyestudio Micro:bit Mini Smart Robot Car V2 Instructions Manual page 106

What will you see
Send the source code to micro:bit main board, then insert the micro:bit main board into the robot shield and
connect a 18650 battery; turn the POWER switch ON.
The two infrared obstacle detector sensors on the micro:bit robot shield can detect an obstacle ahead.
 If both infrared sensors do not detect obstacles, the LED matrix will show an upward arrow.
 If both infrared sensors detect obstacles, the LED matrix will show a smile face.
 If the left infrared sensor detects an obstacle but right one doesn't, the LED matrix will show a leftward
arrow.
 If the right infrared sensor detects an obstacle but left one doesn't, the LED matrix will show a rightward
arrow.
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