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Friday, October 4, 2013
Light Level Indicator Using a Window Comparator
The second example below uses a LDR (light dependent resistor) to indicate some desired light level. The LDR has a large dynimic range and varies in resistance from less than 100 ohms on a cloudy day to over a megohm in total darkness. A 2K pot was used to adjust the window range for usual room light conditions. This setup might also be used to indicate sunrise/sunset conditions.
Light Level Indicator Circuit Diagram
Light Level Indicator Circuit Diagram
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