This is a very small light sensor.A photocell changes (also called a photodetector, CDS or photoconductive cell) resistance depending on the amount of light it is exposed to.When it's dark,the dark resistance is 1~10MΩ.When it's high light,the light resistance can be from hundreds to thousands Ohm.These little sensors make great ambient light triggers (when light in the room turns on do something).
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