Visible-light based communication and occupancy detection
AssigneeCooper Technologies Company
InventorBrian Eugene Elwell
Life of this patent
Estimating the term…
Abstract
A lighting device for illumination, data communication, and occupancy detection includes a processor and a transmitter circuit that is configured to generate a first electrical signal. During a first time duration, the first electrical signal is a carrier signal having a first frequency, and during a second time duration, the first electrical signal is a data encoded signal. The lighting device further includes a light source configured to emit a first visible light based on the first electrical signal. The lighting device also includes a receiver configured to receive a second visible light. The processor is configured to detect a motion in a monitored area based on the second visible light.
Claims9
A lighting device for illumination, data communication, and occupancy detection, the lighting device comprising:
- a processor;
- a transmitter circuit configured to generate a first electrical signal;
- a light source configured to emit a first visible light based on the first electrical signal;
- and
- a receiver configured to receive a second visible light and to convert the second visible light into a second electrical signal, wherein the processor is configured to determine whether the second electrical signal is a carrier signal that is unencoded with data and wherein the processor is configured to detect a motion in a monitored area based on the second electrical signal in response to determining the second electrical signal is the carrier signal.
Dependencies are inferred from the claim text.