int ldrPin = 2;
int redLedPin = 8;
int greenLedPin = 7;
int buzzerPin = 4;

void setup() {
  pinMode(redLedPin, OUTPUT);
  pinMode(greenLedPin, OUTPUT);
  pinMode(buzzerPin, OUTPUT);
  pinMode(ldrPin, INPUT);
  Serial.begin(9600);
}

void loop() {
  int sensorValue = analogRead(ldrPin);


  if (sensorValue < 500) {
    digitalWrite(redLedPin, HIGH);
    digitalWrite(greenLedPin, LOW);
    tone(buzzerPin, 1000);
    Serial.println(" Something Detected AAARRRGGGGHHHHH. ");

  } else {
    digitalWrite(redLedPin, LOW);
    digitalWrite(greenLedPin, HIGH);
    noTone(buzzerPin);
    Serial.println(" Nothing detected.");
  }

  delay(1000); // Tunda selama 1 detik sebelum membaca ulang sensor.
}