const int buzzerPin = D2; // Pin D2 connects to the buzzer

void setup() {
  pinMode(buzzerPin, OUTPUT);
}

void loop() {
  // High "Deee" sound (Normal buzzer resonant frequency)
  tone(buzzerPin, 2300); 
  delay(300); 
  
  // Lower "Dooo" sound (Siren drop pitch)
  tone(buzzerPin, 1800); 
  delay(300); 
}