Digital occupancy sensor light control
AssigneeLeviton Manufacturing Co., Inc.
InventorsPaul Soccoli, Michael Ostrovsky, Al Lombardi
Life of this patent
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Abstract
A method of sensing motion in a predetermined area is provided. The method may include using a digital output motion sensor to produce a digital output signal indicative of the presence of motion in the predetermined area. The method may further include transmitting the digital output signal along a signal path independent of analog amplification and filtering. The method may also include using a microprocessor coupled to the signal path to receive the digital output signal and to process the digital output signal.
Claims36
A passive infrared-based occupancy sensor load control comprising:
- a digital output motion sensor that produces a digital output signal and transmits the digital output signal along a signal path independent of analog amplification and filtering, the output signal that indicates the presence or absence of motion, the output signal including signal information that is free from losses attributable to analog amplification and analog filtering;
- and
- a microprocessor coupled to the signal path, the microprocessor that receives and processes the digital output signal to produce a second signal, the second signal for comparing to a threshold, and controls resetting of a time delay for switching of the load in response to the comparison of the second signal to the threshold.
A method of sensing motion in a predetermined area, the method comprising:
- using a digital output motion sensor to produce a digital output signal indicative of the presence of motion in the predetermined area;
- transmitting the digital output signal along a signal path independent of analog amplification and filtering;
- using a microprocessor coupled to the signal path to receive the digital output signal and to process the digital output signal to produce a second signal, the second signal for comparing to a threshold;
- and
- using the microprocessor to control resetting of a time delay for switching of a load in response to the comparison of the second signal to the threshold, the time delay representing a magnitude of elapsed time since the load changed state.
A method for comparing historic information with obtained characteristics of an output signal from a motion sensor in order to adjust the sensitivity and/or the delayed-off time of the sensor, the method comprising:
- receiving the output signal from the sensor prior to amplification of the output signal;
- filtering the output signal to obtained a filtered signal;
- analyzing the time constants of the filtered signal;
- calculating an adaptive threshold at least in part based on signal conditions;
- comparing the conditioned signal with the adaptive threshold;
- and
- generating a control signal in response to the comparing the conditioned signal with the adaptive threshold.
Dependencies are inferred from the claim text.