KY-018 Photo resistor module

The KY-018 Photo resistor module is made up of a small printed circuit board measuring 20x15mm, fitted with a 3-pin pin header, a 5mm diameter photoresistor and a resistor. The photoresistor is part of a voltage divider, the light, by varying the total resistance, modifies the output voltage which can be measured via one of the Arduino A / D pins.
For more information see KY-018 Modulo fotoresistenza