This Room is Occupied sensor

I spent 4 days in hotels this week, and was totally annoyed by the cleaning staff trying to enter the room 3 times over 4 days while I was in the room.

I want a motion sensor installed in the room, one in the main room, one in the bathroom, that senses movement. This sets the room “isOccupied” flag to Occupied.

On the door leaving the room, there is another sensor that notices when the door is opened, and sets the flag to Not Occupied.

On the outside of the door, built into the door frame, is a small LED sensor, that is lit green when the room is occupied.

This would instantly let the staff know when someone is still in their room.

This sensor system would also be useful for homes, and for small restrooms in commercial spaces.

It even could serve as a security device in homes, small offices and cars, letting you know that someone is in the building before you enter.