It will give the IR to make the common ground with the circuit and Power supply. Pin 2 is the cathode pin of the IR within the optocoupler. It will give the logical input signal to the internal IR. Pin 1 is an anode pin of IR input within the Optocoupler. The PC817 Optocoupler is small in size and comes in multiple packages. The IR circuit can be designed by hand but we have a fully predesigned and small size integrated circuit IC knows as PC817 Optocoupler. The Electrical signal transfers between an input and an output side optically without any physical connection between both sides. PC817 consists of an LED emitting diode and phototransistor. The other part receives the signal and then performs according to the circuit design. In PC817 photoisolator IC circuit, the IR receives the noisy signal as a power from the one circuit and passes it to the other part through the IR signal. This circuit is only applicable where the incoming signal has some information or data but when we just need to forward the signal from one part of the circuit to the other part but signal contains noise, then we could use the combination of IR sender and receive. The circuit based on the capacitor and resistor always removes the noise from the incoming signal but the value capacitor and resistor always depend on the incoming signal.
In electric circuits, we use mostly filters to remove noise.
PC817 is an optoisolator consists of an infrared diode and phototransistor.
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