Keyestudio 4WD Manual page 261

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(2)Working Principle:
When the car runs above a white road, the infrared transmitter tube
installed under the car emits infrared signals to detect the road and the
receiver tube receives signals sending back. Then the output end outputs
low level(0); when it detects black lines, it outputs high level(1).
The 2-way tracking sensor integrated port on the 4WD Mecanum Robot
Car is connected to the collection port of G ,5V ,P1 and P2 on the micro:bit
expansion board, which is controlled by the P1 and P2 of the micro:bit. The
left TCRT5000 infrared pair tube on the sensor is controlled by P1, and the
right one by P2.
After putting a white paper on the bottom of the 4WD Mecanum Robot
Car,we rotate the two potentiometers on the 2-way tracking sensor. When
the indicator light on the sensor module is on, pick up the car to make the
two wheels on the 4WD Mecanum Robot Car separate. The height of the
white paper is about 1.5cm, the indicator light on the sensor module is off,
and then the sensitivity is adjusted.
(3)Experimental Preparation：
 Insert micro:bit board into slot of keyestudio 4WD Mecanum Robot Car
 Place batteries into battery holder
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