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HOW TO SENSE 12 VOLT DC VOLTAGE USING MICROCONTROLLER?

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SparkyFX:
I don“t see why that reed switch should not operate at the microcontrollers operating voltage. Or switch ground with a pull up?

wabhavkumar:
I am really sorry for posting an incomplete question.
yes, if no/nc switch is connected with 50m length of wire, then this circuit is not working properly.
Can anyone suggest some better circuit?

Raj:
go see Reply #20 on: 06-07-2018, 18:21:35

Use it.

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