Component knowledge
Photoresistor
Photoresistor is a light sensitive resistor. When the strength that light casts onto the photoresistor surface is
not the same, resistance of photoresistor will change. With this feature, we can use photoresistor to detect
light intensity. Photoresistor and symbol are as follows.
The circuit below is often used to detect the change of photoresistor resistance:
In the above circuit, when photoresistor resistance changes due to light intensity, voltage between
photoresistor and resistor R1 will change, so light's intensity can be obtained by measuring the voltage.
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