const int buzzerPin = 8; // Digital pin connected to the buzzer
int fadeAmount = 5; // Amount to increase or decrease the volume
int volume = 0; // Variable to store the current volume level

void setup() {
  pinMode(buzzerPin, OUTPUT); // Set the buzzer pin as output
}

void loop() {
  // Fade in
  analogWrite(buzzerPin, volume);

  volume = volume + fadeAmount;

  if(volume <= 0 || volume >= 255){
    fadeAmount = -fadeAmount;
  }

  delay(10);
}