// Define the pin that the speaker is connected to
#define SPEAKER_PIN 9

void setup() {
  // Set the speaker pin as an output
  pinMode(SPEAKER_PIN, OUTPUT);
}

void loop() {
  // Play a C note for 500 milliseconds
  tone(SPEAKER_PIN, 262, 500);
  delay(500);

  // Play a D note for 500 milliseconds
  tone(SPEAKER_PIN, 294, 500);
  delay(500);

  // Play an E note for 500 milliseconds
  tone(SPEAKER_PIN, 330, 500);
  delay(500);

  // Stop playing sound
  noTone(SPEAKER_PIN);
  delay(1000);
}