4 years ago
Since you had to ask a second time my price is now $59.99, full retail value.
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sells those things.
Unlike a switch, a drop of water, is like a resistor and two drops are like two resistors in parallel which if you know DC circuits will present a lower DC resistance to an analog_to_digital_converter ADC present in most micro processors.
You need to have alternating metal strips attached to a insulating waterproof support structure like a glass, fiberglass, or most plastics and a position that self drains any water after a while.. You could try to use a $3 ohm meter to measure the rain...