Ambient light sensor auto-calibration in a lighting control system
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United States of America Patent
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Feb 11, 2014
Grant Date -
Sep 15, 2011
app pub date -
Mar 13, 2010
filing date -
Mar 13, 2010
priority date (Note) -
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Abstract
A lighting system includes a master that controls a plurality of light fixtures via wireless RF communications. An ambient light sensor in the master is used to monitor total ambient light and to prevent excessive illumination. In an auto-calibration process, the master makes ambient light measurements A, B and C when the light fixtures are illuminating an area at a minimum setting, at a maximum setting, and at an intermediate setting, respectively. A first threshold is set to be approximately (B−A). A second threshold is set to be slightly larger than (B−A)+(B−C). In normal system operation, total ambient light measurements are taken and compared to the two thresholds. In one example, if detected brightness is lower than the first threshold then the system is set at its maximum illumination setting, whereas if detected brightness is greater than the second threshold then the system is set at its intermediate illumination setting.
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