int sensorPin = A0;    // Pin connected to the LDR (Light Sensor)
int sensorValue = 0;   // Variable to store sensor readings
int relay1 = 5;        // Relay 1 connected to pin 5
int relay2 = 6;        // Relay 2 connected to pin 6
int relay3 = 7;        // Relay 3 connected to pin 7

void setup() {
  Serial.begin(9600);
  pinMode(sensorPin, INPUT);
  pinMode(relay1, OUTPUT);
  pinMode(relay2, OUTPUT);
  pinMode(relay3, OUTPUT);
}

void loop() {
  sensorValue = analogRead(sensorPin);  // Read the sensor value from A0
  Serial.println(sensorValue);          // Display the sensor value in the serial monitor

  // Check sensor value and control the relays accordingly
  if (sensorValue <= 50) {
    digitalWrite(relay1, HIGH);  // Only relay 1 is ON
    digitalWrite(relay2, LOW);
    digitalWrite(relay3, LOW);
  } 
  else if (sensorValue <= 300) {
    digitalWrite(relay1, LOW);
    digitalWrite(relay2, HIGH);  // Only relay 2 is ON
    digitalWrite(relay3, LOW);
  } 
  else if (sensorValue <= 500) {
    digitalWrite(relay1, LOW);
    digitalWrite(relay2, LOW);
    digitalWrite(relay3, HIGH);  // Only relay 3 is ON
  } 
  else {
    digitalWrite(relay1, HIGH);  // All relays are ON
    digitalWrite(relay2, HIGH);
    digitalWrite(relay3, HIGH);
  }

  delay(500);  // Delay for stability
}