LDR-based Smart Street Light Simulation on Wokwi

OBJECTIVE

To design a smart street lighting system using an LDR sensor and Arduino that automatically turns ON 4 street lights (LEDs) when it gets dark, and turns them OFF during daylight.

MODULES REQUIRED

Arduino uno
Ldr sensor
LED (4)

SCHEMATIC DIAGRAM

SCHEMATIC CONNECTION

Connect LDR:

Connect the VCC pin of the Ldr to the 5v pin on the Arduino .

Connect the GND pin of the Ldr to the GND pin on the Arduino .

Connect the A0 pin of the Ldr to the A0 pin on the Arduino.

Connect the D0 pin of the Ldr to the D13 pin on the Arduino.

Connect leds:

Connect the +ve pin of the led1 to the D12 pin on the Arduino .

Connect the -ve pin of the led1 to the Gnd pin on the Arduino.

Connect the +ve pin of the led2 to the D11 pin on the Arduino.

Connect the -ve pin of the led 2 to the Gnd pin on the Arduino.

Connect the +ve pin of the led 3 to the D10 pin on the Arduino.

Connect the -ve pin of the led 3 to the Gnd pin on the Arduino.

Connect the +ve pin of the led 4 to the D9 pin on the Arduino .

Connect the -ve pin of the led 4 to the Gnd pin on the Arduino .

To begin your project, click this template link:

Simulate on Wokwi

ARDUINO CODE


#const int ldrpin = 13;
const int led1 = 12;
const int led2 = 11;
const int led3 = 10;
const int led4 = 9;

void setup() {
  pinMode(ldrpin, INPUT);
  pinMode(12, OUTPUT);
  pinMode(11, OUTPUT);
  pinMode(10, OUTPUT);
  pinMode(9, OUTPUT);
}
void loop() {
  int data=digitalRead(ldrpin);
  if (data == 0){
    digitalWrite(12, HIGH);
    digitalWrite(11, HIGH);
    digitalWrite(10, HIGH);
    digitalWrite(9, HIGH);
  }
  else{
    digitalWrite(12, LOW);
    digitalWrite(11, LOW);
    digitalWrite(10, LOW);
    digitalWrite(9, LOW);
  }
}

INSTRUCTIONS

Assemble the circuit by connecting all components as shown in the schematic diagram.

On the left side of the screen, open sketch.ino and write your Arduino code.

After completing the circuit and writing the code, click the green Play button to start the simulation.

This smart street lighting system uses an LDR sensor and Arduino to detect light levels, adjusting LED states based on a threshold to turn ON in darkness and OFF in daylight.

WORKING PRINCIPLE

The smart street lighting system uses an LDR sensor and Arduino to detect light levels and automatically control 4 LEDs to turn ON in darkness and OFF in daylight.

Project Link

for your reference.