Question

Help: If someone could please explain the concept of IR interruption, bias voltage, and what the diagram is showing I appreciate it. The description confused me even more. the second picture shows how the IR diodes are positioned facing each other for reference.

BRIEF DESCRIPTION OF IR & PHOTO DIODE SENSING SWITCH -や 80547 IR diode is connected through a resistance to the dc supply. A photo diode is connected in reverse biased condition through a potential divider of a 10k variable resistance and lk in series to the base of the transistor. While the IR rays fall on the reverse biased photo diode it conducts that causes a voltage at the base of the transistor. The transistor then works like a switch while the collector goes to ground. Once the IR rays are obstructed the driving voltage is not available to the transistor thus its collector goes high. This low to high logic can be used for the microcontroller input for any action as per the program.

Answer 1

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