What transistor(PNP or NPN) is best to connect an IR proximity sensor using IC LM358 to connect to a 5V Relaly?
December 16, 2020
You can use a "Phototransistor". Which one? preferably one which matches the "Peak wavelength" of the IR emitter (from 570 to 990 nm), the current it lets passing through in the "dark", the current you want to pass through under "light", the raise time and fall time (how responsive it has to be), the voltage to block, etc... Check Mouser/Digikey/etc, they have a nice set of filters to help you to choose the ones that fit your case.
December 18, 2020
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