// Define pin numbers
const int ldrPin = A0;     
const int relayPin = 2;     


const int lightThreshold = 300; 

void setup() {
  pinMode(relayPin, OUTPUT);   
  digitalWrite(relayPin, LOW); 
  Serial.begin(9600);         
}

void loop() {
  
  int ldrValue = analogRead(ldrPin);
  
  
  Serial.print("LDR Value: ");
  Serial.println(ldrValue);
  
  
  if (ldrValue < lightThreshold) {
    digitalWrite(relayPin, HIGH); 
    Serial.println("Relay ON");
  } else {
    digitalWrite(relayPin, LOW);  
    Serial.println("Relay OFF");
  }
  
  delay(500); 
}