Patent ID: 8228184
Filing Date: 2012-07-24
Classification: G08B,H05B,Y02B

Abstract:
1. A load control system for controlling the amount of power delivered from an AC power source to an electrical load in a space in response to detecting the presence or absence of an occupant in the space, the system comprising: a load control device adapted to be coupled in series electrical connection between the AC power source and the electrical load for control of the amount of power delivered to the electrical load, the load control device operable to receive wireless control signals and to control the amount of power delivered to the electrical load in response to the wireless control signals; an occupancy sensor comprising a controller, an occupancy detector circuit for detecting the presence or absence of the occupant in the space and a wireless transmitter for transmitting a first wireless control signal to the load control device in response to the occupancy detector circuit detecting the presence of the occupant in the space, the load control device operable to enable the delivery of power to the electrical load in response to the first wireless control signal, the occupancy sensor further comprising a battery for powering the controller and the wireless transmitter, the controller operable to monitor the magnitude of a battery voltage of the battery; and a visual indicator for providing a visual indication when the magnitude of the battery voltage has dropped below a predetermined low-battery voltage threshold.