Wake-up of light sensor in a lighting system
AssigneeKoninklijke Philips Electronics N.V.
InventorRoger Peter Anna Delnoij
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Abstract
A wireless light sensor, being part of a lighting system, has a sensor element generating a light measuring signal, a microcontroller coupled to the sensor element, and a radio communication device coupled to the microcontroller. The microcontroller has an active mode and a sleeping mode. The light sensor further has a wake-up circuit which determines a rate of change of the light measuring signal, when the microcontroller is in the sleeping mode. The wake-up circuit brings the microcontroller from the sleeping mode into the active mode, when the rate of change of the light measuring signal exceeds a predetermined threshold.
Claims8
A wireless light sensor comprising
- a sensor element generating a light measuring signal;
- a microcontroller coupled to the sensor element, the microcontroller having an active mode and a sleeping mode;
- and
- a radio communication device coupled to the microcontroller, wherein the light sensor further comprises a wake-up circuit configured for
- determining a rate of change of the light measuring signal, when the microcontroller is in the sleeping mode, and
- bringing the microcontroller from the sleeping mode into the active mode, when the rate of change of the light measuring signal exceeds a predetermined threshold.
A method of operating a wireless light sensor, the light sensor comprising
- a sensor element generating a light measuring signal;
- a microcontroller coupled to the sensor element, the microcontroller having an active mode and a sleeping mode, and
- a radio communication device coupled to the microcontroller,
- wherein the microcontroller has an active mode and a sleeping mode, and wherein the method comprises
- determining a rate of change of the light measuring signal, when the microcontroller is in the sleeping mode, and
- bringing the microcontroller from the sleeping mode into the active mode, if the rate of change of the light measuring signal exceeds a predetermined threshold.
Dependencies are inferred from the claim text.