const int relayPin = 17; 
const int ldrPin = 19;   
const int motionPin = 4; 

void setup() {
  Serial.begin(115200); 
  pinMode(relayPin, OUTPUT); 
  pinMode(motionPin, INPUT); 
}

void loop() {
  int ldrValue = analogRead(ldrPin); 
  int motionDetected = digitalRead(motionPin); 

  Serial.print("LDR Value: ");
  Serial.println(ldrValue);
  Serial.print("Motion: ");
  Serial.println(motionDetected);

  if (motionDetected == HIGH && ldrValue < 500) {
    digitalWrite(relayPin, HIGH); 
    Serial.println("Relay turned ON"); 
  } 
  
  else {
    digitalWrite(relayPin, LOW); 
    Serial.println("Relay turned OFF"); 
  }

  delay(1000); 
}