Side looking occupancy sensor
A side looking occupancy sensor is incorporated in a conventional wall switch mounted into a switch box adjacent to a door. The side-looking proximity sensor preferably is mountable to either side of the doorjamb to make the side-looking proximity sensor face the door opening. During operation, the side-looking sensor monitors the door movement or senses the passage of a person for indication that a person is entering or leaving the space. Entry and exit determination is made based on activation of the side-looking sensor.
1. An occupancy sensor system for controlling the application of electrical power to electrical loads in a room with a doorway within a door opening comprising:
a load control device mounted adjacent to the doorway, the load control device having a housing and controller;
a proximity sensor in the housing for sensing people passing through the doorway, the proximity sensor having two zones of monitoring and operably coupled to the controller to provide a signal to the controller when people pass through the doorway wherein the first monitoring zone is adjacent to the door opening and the second monitoring zone is at a distance away from the door opening;
an occupancy sensor in the room for sensing when a person enters or leaves the room, the occupancy sensor operably coupled to the controller to provide a signal to the controller when a person enters or leaves the room;
wherein the controller is programmed to apply power to the electrical loads upon detection of activation in the first monitoring zone before an activation in the second monitoring zone or disconnect power to the electrical loads upon detection of an activation in the second monitoring zone before activation in the first monitoring zone.
2. The occupancy sensor system of claim 1 wherein the controller is programmed to:
apply power to the electrical loads in response to a first signal from the proximity sensor and a first signal from the occupancy sensor; and
to establish a first time-out period; and
apply power to the electrical loads in response to a first signal from the proximity sensor and a second signal from the occupancy sensor; and
to establish a second time-out period with the second time-out period is shorter than the first time-out period.