As PIR motion sensors alone cannot reliably sense a stationary person Mount Kelvin combines data from motion sensors, switches, and door sensors to make a determination about whether or not a guest is present in a room.
This places some requirements on the placement of sensors in the room. The logic of the occupancy sensing is as follows:
- When the door is closed, we observe the room for a period of time called the quiet period.
- If no movement or switch presses happen during the quiet period, the status of the room is set as unoccupied
- If movement or switch presses are detected when the room is in an unoccupied state, the status of the room is immediately set as occupied.
A simple way to understand this is: the room can become unoccupied only after the door has been opened and closed and no movement has been detected during the quiet period but is deemed occupied from any motion or switch press.
The quiet period can be set in the Fleet manager. The optimum value depends on sensor placement, room type, and customer profile, but generally, 45 minutes is a good default value.