const int ledPin = 8;

const int buzzerPin = 4;

const int ldrPin = A0;

void setup () {

    Serial.begin(9600);

    pinMode(ledPin, OUTPUT);

    pinMode(buzzerPin, OUTPUT);

    pinMode(ldrPin, INPUT);

}

void loop() {

    int ldrStatus = analogRead(ldrPin);

    if (ldrStatus >= 30) {

        noTone(buzzerPin);

        digitalWrite(ledPin, LOW);

    }

    else {

        tone(buzzerPin, 100);

        digitalWrite(ledPin, HIGH);

        delay(100);

        noTone(buzzerPin);

        digitalWrite(ledPin, LOW);

        delay(100);

        Serial.println("----------- ALARM ACTIVATED -----------");

    }

}