If I want to use two wires to detect water in the basement. I was wondering if I can just put 5V from the voltage regulator down on one probe, and then 1/2 inch away put in the other probe for the input to the ATMega? What if standing water is next to a pipe? Or somehow conducts to ground? Will I ne…

Using two wires to detect water - making your own water sensor

mart256 April 11, 2014, 1:52pm 3

I would use an Optocoupler. Check the schematic.

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