Objective:

         To detect the Light Intensity using LDR Sensor

Components Required

• Arduino Uno
• Light Dependent Resistor (LDR) Sensor
• Resistance (1K Ohm)

Connection Diagram

Program

void setup()

{

Serial.begin(9600);

}

void loop()

{

int sensorValue = analogRead(A0);

Serial.print(“Light Intensity is :”);

Serial.print(sensorValue);

}

Working

         The output of the LDR sensor is accessed by the Arduino Uno and displayed. For more light intensities (Bright) the LDR allows more current and produces large values and for less light intensities (Dark) the LDR blocks the current flow and produces low values.

Output

The output value is : 1023 (for maximum brightness)

The output value is : 0 (for dark)