Electrical field of view control for a passive light sensor
AssigneeCree Lighting USA LLC
InventorsAmruteshwar Hiremath, Jin Hong Lim, Kory A. Liszt
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Abstract
A motion sensing device adapts a field of view around a primary sensing axis of the motion sensing device by electrically controlling a detection sensitivity of a passive infrared sensor of the motion sensing device. Responsive to adapting the field of view, the motion sensing device monitors for motion within the field of view using the passive infrared sensor.
Claims18
A method, implemented in a motion sensing device, the method comprising:
- adapting a field of view around a primary sensing axis of the motion sensing device by electrically controlling a detection sensitivity of a passive infrared sensor of the motion sensing device;
- and
- responsive to adapting the field of view, monitoring for motion within the field of view using the passive infrared sensor, wherein electrically controlling the detection sensitivity comprises setting a threshold for comparison by a comparator to an electrical output of the passive infrared sensor.
A motion sensing device comprising:
- a passive infrared sensor;
- and
- control circuitry communicatively coupled to the passive infrared sensor and configured to
- adapt a field of view around a primary sensing axis of the motion sensing device by electrically controlling a detection sensitivity of the passive infrared sensor;
- and
- responsive to adapting the field of view, monitor for motion within the field of view using the passive infrared sensor, wherein the control circuitry comprises a programmable resistor and a controller communicatively coupled to the programmable resistor.
A method of manufacturing a motion sensing device, comprising:
- providing a passive infrared sensor;
- and
- electrically coupling a first input of a comparator to an output of the passive infrared sensor and a second input of the comparator to a threshold voltage source, wherein an output of the comparator is indicative of motion within a field of view of the passive infrared sensor.
A method, implemented in a motion sensing device, the method comprising:
- adapting a field of view around a primary sensing axis of the motion sensing device by electrically controlling a detection sensitivity of a passive infrared sensor of the motion sensing device;
- and
- responsive to adapting the field of view, monitoring for motion within the field of view using the passive infrared sensor, wherein electrically controlling the detection sensitivity comprises altering a gain of a circuit portion coupled to an output of the passive infrared sensor.
A motion sensing device comprising:
- a passive infrared sensor;
- and
- control circuitry communicatively coupled to the passive infrared sensor and configured to:
- adapt a field of view around a primary sensing axis of the motion sensing device by electrically controlling a detection sensitivity of the passive infrared sensor;
- and
- responsive to adapting the field of view, monitor for motion within the field of view using the passive infrared sensor, wherein the control circuitry comprises a controller, a comparator coupled to an output of the passive infrared sensor, wherein an output of the comparator is indicative of motion within the field of view, and a digital-to-analog converter configured to receive, from the controller, a signal indicative of a desired threshold for the comparator and to output, to the comparator, a converted signal based on the received signal.
Dependencies are inferred from the claim text.