Several months ago I stayed in a hotel in which the room used an “occupancy sensor” to automatically shut off the air conditioner if no movement was detected after a brief delay. I didn’t consider it a true occupancy sensor. Instead, this seemed more like a simple motion sensor.
In my opinion an occupancy sensor shouldn’t shut off the A/C if someone is still in the room. For example, it should be able to detect the body heat of a room’s occupants. After one night of sleeping in a warm room I cobbled together a simple solution.
The core concept is to generate movement that will continuously trigger the motion sensor.