Dual-technology occupancy detection
Apparatuses, methods and systems for dual-technology occupancy detection are disclosed. One dual-technology occupancy detection apparatus includes a motion sensor sensing motion, an ambient light sensor sensing variation in ambient light, and a controller for detecting occupancy and controlling a building environmental parameter based on the sensed motion and the sensed variations in ambient light. One method of detecting occupancy for controlling lighting includes sensing motion with a motion sensor, sensing variations in ambient light with an ambient light sensor, and detecting occupancy and controlling activation of a light based on the sensed motion and the sensed variations in ambient light.
1. A dual-technology occupancy detection apparatus, comprising:
a motion sensor sensing motion, wherein the motion sensor is operative to generate N digital samples of the sensed motion;
an ambient light sensor sensing motion and presence of a person by sensing variation in ambient light;
a controller operative to:
detect occupancy and control a building environmental parameter based on the sensed motion of the motion sensor and the sensed motion and presence of the person as indicated by the sensed variations in ambient light;
match the N digital samples of the sensed motion with one of a plurality of stored patterns of events; and
identify an event associated with the sensed motion based on a match between a one of the plurality of patterns and the N digital samples of the sensed motion.
2. The apparatus of claim 1 , wherein the building environmental parameter includes activation and intensity of a light.
3. The apparatus of claim 1 , wherein the building environmental parameter includes temperature.
4. The apparatus of claim 1 , wherein the building environmental parameter includes security control.
5. The apparatus of claim 1 , wherein the sensing motion comprises a PIR (passive infrared) motion sensor sensing the motion.
6. The apparatus of claim 1 , further comprising the controller operative to activate the light for a predetermined period of time upon the motion sensor sensing motion greater than a threshold.
7. The apparatus of claim 6 , further comprising the controller operative to extend the activation of the light beyond the predetermined period if the ambient light sensor senses variations in ambient light greater than a second threshold.
8. The apparatus of claim 6 , further comprising the controller operative to over-ride the activation of the light within the predetermined period if the ambient light sensor senses variations in ambient light less than the threshold.
9. The apparatus of claim 1 , wherein N is a power of two.
10. The apparatus of claim 1 , wherein the motion sensor comprises an IR sensor, and further comprising the controller operative to:
detect occupancy and control activation of the light based on the sensed motion and the sensed variations in ambient light.
11. The apparatus of claim 1 , further comprising the controller operative to identify a fire within a structure in which the motion sensor and the ambient light sensor are located, comprising, the controller identifying a following sequence of events:
determine a lack of occupancy by sensing motion of less than a threshold for a predetermined amount of time;
detect a sensed motion of greater than the threshold after the predetermined amount of time;
sense a variation in sensed ambient light of greater than a first detect threshold after the predetermined amount of time.
12. The apparatus of claim 11 , further comprising a plurality of motion sensors and a plurality of ambient light sensors, and wherein the fire is detected if at least N of M motion sensors and ambient light sensors detect the sequence of events.
13. The apparatus of claim 11 , further comprising the controller communicating a fire alert to an external controller if fire is identified.
14. The apparatus of claim 1 , further comprising the controller operative to identify smoke within a structure in which the motion sensor and the ambient sensor are located, comprising the controller operative to identify a following sequence of events:
determine a lack of occupancy by sensing motion of less than a threshold for a predetermined amount of time;
sense a variation in sense ambient light of greater than a first detect threshold after the predetermined amount of time.
15. The apparatus of claim 14 , further comprising a plurality of motion sensors and a plurality of ambient light sensors, and wherein the smoke is identified if at least N of M motion sensors and ambient light sensors detect the sequence of events.
16. The apparatus of claim 14 , further comprising the controller communicating a smoke alert to an external controller if smoke is identified.
17. The apparatus of claim 1 , further comprising the controller operative to identify a water leak within a structure in which the motion sensor and the ambient sensor are located, comprising the controller operative to identify a sequence of events comprising:
determine a lack of occupancy by sensing motion of less than a threshold for a predetermined amount of time;
sense a cyclic variation in sensed ambient light during the predetermined amount of time.
18. The apparatus of claim 17 , further comprising the controller operative to communicate water leak alert to an external controller if a water leak is detected.
19. The apparatus of claim 17 , further comprising a plurality of motion sensors and a plurality of ambient light sensors, and wherein the water leak is identified if at least N of M motion sensors and ambient lights sensor detect the sequence of events.
20. The apparatus of claim 1 , further comprising the controller detecting a lack of occupancy if the motion sensor senses a motion above a major motion threshold, followed by sensing motion of less than a minor motion threshold for a preselected period of time after sensing motion above the major motion threshold.
21. The apparatus of claim 1 , further comprising the controller operative to:
light harvesting upon sensing ambient light greater than a threshold, wherein light harvesting comprises reducing an intensity of a light when ambient light is sensed greater than the threshold;
over-riding the light harvesting if the sensed ambient light greater than the threshold occurs during a period in which motion is sensed greater than an occupancy threshold.
22. A method of a dual-technology fixture detecting occupancy, comprising:
sensing motion with a motion sensor, wherein the motion sensor is operative to generate N digital samples of the sensed motion;
sensing motion and presence of a person by sensing variations in ambient light with an ambient light sensor;
detecting occupancy and controlling activation of a building parameter based on the sensed motion of the motion sensor and the sensed motion and presence of the person as indicated by the sensed variations in ambient light;
matching the N digital samples of the sensed motion with one of a plurality of stored patterns of events; and
identifying an event associated with the sensed motion based on a match between a one of the plurality of patterns and the N digital samples of the sensed motion.
23. The method of claim 22 , wherein the building parameter comprises activation of a light, and further comprising activating the light for a predetermined period of time upon sensing motion greater than a threshold.
24. The method of claim 23 , further comprising extending the activation of the light beyond the predetermined period if the ambient light is sensed to have variations greater than a threshold.
25. The method of claim 23 , further comprising over-riding the activation of the light within the predetermined period if the ambient light is sensed to have variations less than the threshold.
26. The method of claim 23 , further comprising:
sensing motion with an IR sensor;
detecting occupancy and controlling activation of the light based on the sensed motion and the sensed variations in ambient light.
27. The method of claim 22 , further comprising identifying a fire within a structure in which the motion sensor and the ambient sensor are located, comprising, identifying a following sequence of events:
determining a lack of occupancy by sensing motion of less than a threshold for a predetermined amount of time;
detecting a sensed motion of greater than the threshold after the predetermined amount of time;
sensing a variation in sense ambient light of greater than a first detect threshold after the predetermined amount of time.
28. The method of claim 22 , further comprising identifying smoke within a structure in which a plurality of motion sensors and a plurality of ambient sensors are located, comprising identifying a following sequence of events:
determining a lack of occupancy by sensing motion of less than a threshold for a predetermined amount of time;
sensing a variation in sense ambient light of greater than a first detect threshold after the predetermined amount of time.
29. The method of claim 22 , further comprising identifying a water leak within a structure in which a plurality of motion sensors and a plurality of ambient sensors are located, comprising identifying a following sequence of events:
determining a lack of occupancy by sensing motion of less than a threshold for a predetermined amount of time;
sensing a cyclic variation in sense ambient light during the predetermined amount of time.
30. A dual-technology occupancy detection apparatus, comprising:
a motion sensor sensing motion;
an ambient light sensor sensing motion and presence of a person by sensing variation in ambient light;
a controller operative to:
detect occupancy and control a building environmental parameter based on the sensed motion of the motion sensor and the sensed motion and presence of the person as indicated by the sensed variations in ambient light;
activate the light for a predetermined period of time upon the motion sensor sensing motion greater than a threshold; and
extend the activation of the light beyond the predetermined period if the ambient light sensor senses variations in ambient light greater than a second threshold.