How to Use a Photoresistor

Operation and uses

The photoresistor is an electronic component which resistivity varies according to the amount of light received ( the resistance decreases when exposed to the light ).

The photoresistor is made of cadmium sulphide tape, a semiconductor.

When photons hit the tapes, electrons can pass through the semiconductor.

The main use of the photoresistor is the measurement of the luminous intensity ( camera, detection systems, … ).

Code

In the " void setup " we initialize the serial monitor :

void setup() {  
Serial.begin(9600);
}

Then, we read the analog value coming from photoresistor and we define it as " value " :

void loop() {  
int value = analogRead(A0);

And we write the value on the serial monitor :

Serial.println("Analog Value :");
Serial.println(value);  
delay(250);
}

Connections

Photoresistor

First pin --> 5V

Second pin --> A0 ( a resistance is connected to the GND and to the photoresistor second pin ).

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