Keyestudio KS0436 Kit Manual page 56

56
Component Introduction:
Photo resistor (Photovaristor) is a resistor
Photo Resistor:
whose resistance varies according to
different incident light strength.
It's made based on the photoelectric effect of semiconductor.
If the incident light is intense, its resistance reduces; if the incident
light is weak, the resistance increases.
Photo resistor is widely applied to various light control circuit, such as
light control and adjustment, optical switches, etc.
Photovaristor is an element that changes its resistance as light strength
changes. So we will need to read the analog values.
We can refer to the PWM experiment, replacing the potentiometer with
photovaristor. When there is change in light strength, there will be
corresponding change on the LED.