An Arduino light sensor circuit is able to detect changes in light. This is pretty handy if you need to make a project that requires being able to tell how light or dark it currently is. For example, an automatic chicken hatch door, automatic lights etc. https://arduinomylifeup.com/arduino-light-sensor/
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Responsive facade system | prototype 1 a sensitive facade system responding to light. the whole system works as a responsive light system. thrue the light sensor, arduino is moving four servo motors that are controlling the opening of the origami geometry.