Water detectors (also known as flood detectors or water leak detectors) are input devices used in HVAC or appliance systems to detect water presence on home floors or on outside walkways. Applications for flood detectors include basement floods; bathroom, washer, or water heater leaks; or forgetting to turn off a water source.
Water leak detectors are commonly wired to DC power, wired to power over Ethernet (PoE), or powered via a battery with wireless connectivity. TI Designs demonstrate several ways to optimize power over Ethernet and DC power designs. In addition, they demonstrate methods for achieving 10+ year battery life in environmental sensor node applications.