Device including light emitting diode as light sensor and...

Details Device including light emitting diode as light sensor and... Device including light emitting diode as light sensor and...

2006-05-09

2006-05-09

Swarthout, Brent A. (Department: 2636)

Communications: electrical

Land vehicle alarms or indicators

Of burglary or unauthorized use

C340S539300, C340S693300, C340S815450, C340S870030, C345S102000, C455S574000

Reexamination Certificate

active

07042341

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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