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Energy-efficient LED Clock

Time, only when you need it

Energy-efficient LED Clock
Clocks with LC display without backlighting are difficult to read in twilight and at night even when a room light is switched on. Unfortunately, with a backlight, an LCD uses almost as much power as an LED display. A practical battery-powered wall clock using an LED display can be designed if it only needs to show the time when someone is there to read it… Sounds like a good application for a PIR motion-detector module.
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