Arduino Photoresistor

Introduction

Simple code to use photoresistor or photocell or light-dependent resistor LDR.

The resistance of a photoresistor decreases when it is hit by light, or it lets electricity flow through it if light is hitting it.

Need to use a voltage divider.

Code

Simple code. Connect

• LDR and a resistor to +5V and GND
• A0 between LDR and R.

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

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

    Serial.print("Analog  Value: ");
    Serial.println(value);
        
    delay(25);
}