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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