#define LDR_PIN A0
#define BUZZER_PIN 8
#define THRESHOLD 4

void setup() {
  Serial.begin(9600);
  pinMode(LDR_PIN, INPUT);
  pinMode(BUZZER_PIN, OUTPUT);
}

void loop() {
  int ldrValue = analogRead(LDR_PIN);
  Serial.println(ldrValue);
  if (ldrValue < THRESHOLD) {
    digitalWrite(BUZZER_PIN, LOW);
  } else {
    digitalWrite(BUZZER_PIN, HIGH);
    tone(BUZZER_PIN,500,650);
    delayMicroseconds(5000);
    noTone(BUZZER_PIN);
    
  }
  delay(500);
}