Keyestudio Ks0428, Manual

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Project 3: Photoresistor Sensor
(1) Description
The photoresistor is a special resistor made of semiconductor
materials such as CdS or Selenide septum. The surface is also
coated with moisture-proof resin, which has a photoconductive
effect. It is sensitive to ambient light. Its resistance varies from
different light intensities.
We use the characteristics of the photo-resistor to design the
circuit and generate the photo-resistor module.
Connecting the signal pin of photocell module to Analog port,
when the stronger the light intensity, the greater the voltage of
analog port, the greater the analog value is.
On the contrary, the weaker the light intensity, the smaller the
voltage of analog port, the smaller the analog value is.
Based on that, we can use the photocell module to read the analog
value, so get the ambient light intensity.