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8.6 Infrared Avoiding Obstacles
8.6.1 Infrared Detection
1) Description
The micro:bit robot car shield comes with two infrared obstacle detector sensors. It is actually designed for
infrared obstacle avoidance robot.
The infrared obstacle detector sensor has a pair of infrared transmitting and receiving tubes.
The transmitter emits an infrared rays of a certain frequency. When the detection direction encounters an
obstacle (reflecting surface), the infrared rays are reflected back, and receiving tube will receive it.
At this time, the indicator (SIG1/SIG2 LED) lights up. After processed by the circuit, the signal output terminal
will output Digital signal.
You can rotate the potentiometer on the shield to adjust the detection distance. It is better to adjust the
potentiometer to make the SIG1/SIG2 LED in a state between on and off. The detection distance is the best,
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