Keyestudio Micro:bit Mini Smart Robot Car - Line Tracking; Test the Tracking Sensor

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8.4 Line Tracking
8.4.1 Test the tracking sensor
1) Description
The tracking sensor is actually an infrared sensor. The component used here is the TCRT5000 infrared tube.
Its working principle is to use the different reflectivity of infrared light to the color, then convert the strength of
the reflected signal into a current signal.
During the process of detection, black is active at LOW level, but white is active at High level.
The following picture is our keyestudio line tracking sensor designed for Micro:bit robot car. We have integrated
3 sets of TCRT5000 infrared tube on a single board, pretty convenient for wiring and controlling.