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LDR Street Light with Arduino and I2C LCD

This project demonstrates an automatic street light system using an LDR sensor module, Arduino Uno, and a 16x2 I2C LCD. The LED automatically turns ON in darkness and turns OFF in bright light.

Components Used

  • Arduino Uno
  • LDR Sensor Module
  • 16x2 I2C LCD
  • LED
  • 220Ω Resistor
  • Jumper Wires
  • Breadboard

Simulation Link

Open Simulation

Circuit Diagram

View Circuit Diagram

Circuit Connections

LDR Sensor Module

LDR Module Pin Arduino Uno
VCC 5V
GND GND
AO A0

I2C LCD Connections

LCD Pin Arduino Uno
VCC 5V
GND GND
SDA A4
SCL A5

LED Connections

LED Pin Arduino Uno
Positive Pin 8 (through 220Ω resistor)
Negative GND

Arduino Code

#include <Wire.h>
#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x27, 16, 2);

int ldrPin = A0;
int ledPin = 8;

void setup() {

  pinMode(ledPin, OUTPUT);

  lcd.init();
  lcd.backlight();

  lcd.setCursor(0, 0);
  lcd.print("Street Light");

  delay(2000);
  lcd.clear();
}

void loop() {

  int ldrValue = analogRead(ldrPin);

  lcd.setCursor(0, 0);
  lcd.print("LDR Value:");

  lcd.setCursor(0, 1);
  lcd.print(ldrValue);
  lcd.print("   ");

  // Dark Condition
  if (ldrValue < 500) {

    digitalWrite(ledPin, HIGH);

    lcd.setCursor(10, 1);
    lcd.print("ON ");
  }

  // Bright Condition
  else {

    digitalWrite(ledPin, LOW);

    lcd.setCursor(10, 1);
    lcd.print("OFF");
  }

  delay(500);
}

How It Works

  • The LDR module detects surrounding light intensity.
  • In darkness:
    • LED turns ON
    • LCD displays ON
  • In bright light:
    • LED turns OFF
    • LCD displays OFF

The LCD also displays the real-time LDR analog value.

Wokwi Simulation

  1. Open Wokwi
  2. Create a new Arduino Uno project
  3. Add:
    • Arduino Uno
    • LDR Sensor Module
    • I2C LCD 16x2
    • LED
  4. Make the connections
  5. Upload the code
  6. Start the simulation

Wokwi Simulator: https://wokwi.com/

Applications

  • Automatic street lighting
  • Smart lighting systems
  • Energy-saving projects
  • Home automation systems

Author

Kritish Mohapatra