I'm trying to create a circuit that detects water, however, I'm looking for a very accurate circuit that can even detect distilled water.
My current circuit uses an Arduino that has a pin constantly set to
HIGH, it triggers an event when water touches two wires that shorts the circuit to ground, creating a
LOW signal. Unfortunately, this only works for non-distilled water. I tested this circuit with water from my kitchen tap and it failed, which is surprising because my city uses well water and I didn't think it could be pure enough to not conduct electricity.
Is there a technique or design I can use to detect water, regardless of its purity?