Build This Handy Leak Detector For $1.02 | Hackaday
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ESPHome Water leak detector With a D1 mini board - Share your Projects! - Home Assistant Community
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Enginursday: Creating a Smart Water Sensor with the ESP32 Thing - News - SparkFun Electronics
The simplest water leak detector you can make at home using aluminium foil, sponge, and battery. No soldering needed! : r/coolguides