Photoresistor module useful for detecting the presence of light.
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The photoresistor is a passive circuit element whose resistance varies depending on the intensity of the light reaching it.
In general, photoresistors are low power and have resistances ranging from a few k Ω to light to resistors of the order of M Ω in the dark.
The module has two LEDs, one for power and the other for the output from the comparator. In this configuration, the circuit detects if the light exceeds a certain threshold.