Ambient light sensing method and apparatus
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United States of America Patent
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-
Mar 26, 1991
Grant Date -
N/A
app pub date -
Oct 25, 1988
filing date -
Oct 25, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A telltale for sensing and responding to ambient light levels. A photosensor monitors light levels and causes a bulb or other controlled element to be energized if ambient levels reach a threshold. In one embodiment a time delay is instituted between sensing the threshold light level and bulb energization. This prevents false triggering on transitory conditions. An additional embodiment has a threshold level that uses hysteresis to avoid unstable sensing near the threshold level. A preferred use for the telltale is in apprising a motor vehicle operator when to turn on the vehicle headlamps.
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