Device including light emitting diode as light sensor and light source
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United States of America Patent
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May 9, 2006
Grant Date -
Feb 17, 2005
app pub date -
Aug 12, 2003
filing date -
Aug 12, 2003
priority date (Note) -
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status (Latency Note)
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Abstract
A battery operated controller for a door operator includes a keypad backlit by a light emitting diode operably connected to a microcontroller which also controls operation of the controller. The microcontroller periodically measures ambient light as sensed by the light emitting diode and when a voltage level related to a predetermined light intensity decreases below a predetermined level the light emitting diode is energized to provide backlighting for the controller keypad. The intensity of backlighting may be varied in accordance with the amount of ambient light illuminating the keypad and above a certain intensity of ambient light the light emitting diode is de-energized to conserve battery power.
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