I am using a pressure mat and water sensor to create a bed occupancy sensor. The idea is when the mat gets enough weight on it the pressure mat will bridge the probes. My question is around battery life, does it use energy when the probes of a water sensor are bridged, does it activate a current? Or does it just go back to dormant mode until the probes are unbridged again?
Background, it’s a villa rental and we’re trying to make it impossible for bedroom AC to stay on 24/7 if the room is not being used, other ideas to achieve this also welcome. The installer suggested IR motion sensors, but they sometimes struggle with people sleeping and we of course don’t want AC randomly shutting down when people are sleeping in their rooms.