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The working principle of the TCRT5000 sensor is the same as general infrared sensor in .TCRT5000 has an infrared transmitting tube and an infrared receiving tube. When the infrared signal transmitting tube by reflection been received , receiving tube resistance changes,
In the circuit to form voltage changes reflected, and results after the ADC conversion or LM324 circuit reshaping get the processed output results. The resistance change depend on infrared received signal strength in the receiving tube, often performance in color and specular reflection surfaces receiving distance two side. Hardware reference principle diagram as follows: