#define MIC_PIN A0           // Define the pin for the microphone sensor
#define buzzerPin 7         // Define the pin for the warning buzzer

int threshold = 500;          // Set the noise threshold for triggering the buzzer

int duration = 1000; // Set the duration of the sound in milliseconds
int pause = 250; // Set the pause between the sounds in milliseconds

void setup() {
  Serial.begin(9600);       // Initialize the serial monitor
  pinMode(buzzerPin, OUTPUT);   // Set the buzzer pin as an output
}

void loop() {
  float noiseLevel = analogRead(MIC_PIN);  // Read the noise level from the microphone sensor
  Serial.print("Noise level: ");
  Serial.println(noiseLevel);
  if (noiseLevel > threshold) {  // Check if the noise level exceeds the threshold
    digitalWrite(buzzerPin, HIGH);   // Trigger the buzzer
    Serial.println("Warning: High Noise level!");
    // Play the emergency alarm sound
    tone(buzzerPin, 880, duration); // 880Hz tone for 0.5 second
    delay(pause); // Pause for 0.25 second
    
    tone(buzzerPin, 1760, duration); // 1760Hz tone for 0.5 second
    delay(pause); // Pause for 0.25 second
    
    tone(buzzerPin, 880, duration); // 880Hz tone for 0.5 second
    delay(pause); // Pause for 0.25 second
    
    tone(buzzerPin, 1760, duration); // 1760Hz tone for 0.5 second
    delay(pause); // Pause for 0.25 second
    
    // Wait for one second before playing the sound again
    delay(1000); // 1000 milliseconds = 1 second
  }
  else {
    digitalWrite(buzzerPin, LOW);  // Turn off the buzzer
  }
  delay(1000);  // Wait for 1 second before taking the next reading
}