Interfacing Photo Resistor With Arduino

Demonstrating Analog Input and Digital Output Using a photo Resistor and LED

Circuit:

Analog Input From Photo Resistor is Connected to A0 pin

LED is Connected to digitalPin 7

Sketch :

void setup(){

pinMode(A0,INPUT);

pinMode(7,OUTPUT);

}

void loop(){

if(analogRead(A0) < 100)

{

digitalWrite(7,HIGH);

}

digitalWrite(7,LOW);

}

Output :