Digital occupancy sensor light control
First Claim
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1. A load control device comprising:
- a signal path independent of analog amplification and filtering;
a digital passive infrared (PIR) motion sensor having an output directly coupled to the signal path, wherein the digital PIR motion sensor produces a raw digital output signal at the output, the raw digital output signal being indicative of the presence or absence of motion;
a microprocessor having an input directly coupled to the signal path, wherein the microprocessor is arranged and configured to receive the raw digital output signal through the signal path independent of analog amplification and filtering and process the raw digital output signal with a low pass filter to select a DC component, the microprocessor configured to perform a load control operation and implement an adapting algorithm to adjust the load control operation in response to the processed raw digital output signal, wherein the microprocessor analyzes the selected DC component to calculate a threshold for the adapting algorithm; and
an ambient light detector electrically coupled to the microprocessor and configured to output an ambient light signal, wherein the load control operation performed by the microprocessor is dependent upon the ambient light signal.
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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.
40 Citations
17 Claims
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1. A load control device comprising:
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a signal path independent of analog amplification and filtering; a digital passive infrared (PIR) motion sensor having an output directly coupled to the signal path, wherein the digital PIR motion sensor produces a raw digital output signal at the output, the raw digital output signal being indicative of the presence or absence of motion; a microprocessor having an input directly coupled to the signal path, wherein the microprocessor is arranged and configured to receive the raw digital output signal through the signal path independent of analog amplification and filtering and process the raw digital output signal with a low pass filter to select a DC component, the microprocessor configured to perform a load control operation and implement an adapting algorithm to adjust the load control operation in response to the processed raw digital output signal, wherein the microprocessor analyzes the selected DC component to calculate a threshold for the adapting algorithm; and an ambient light detector electrically coupled to the microprocessor and configured to output an ambient light signal, wherein the load control operation performed by the microprocessor is dependent upon the ambient light signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A load control device comprising:
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a signal path independent of analog amplification and filtering; a digital passive infrared (PIR) motion sensor having an output directly coupled to the signal path, wherein the digital PIR motion sensor produces a raw digital output signal at the output indicative of the presence or absence of motion; and a microprocessor having an input directly coupled to the signal path, wherein the microprocessor is arranged and configured to; receive the raw digital output signal through the signal path independent of analog amplification and filtering; process the raw digital output signal and perform a load control operation according to the processed raw digital output signal; and implement an adapting algorithm to adjust the load control operation, wherein the microprocessor processes the raw digital output signal with a second order bypass filter having a predetermined frequency range of about 0.25 Hz to about 15 Hz and analyzes the processed raw digital output signal to calculate a threshold for the adapting algorithm. - View Dependent Claims (12, 13, 14, 15, 16, 17)
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Specification