void setup() 
{
  pinMode(2, OUTPUT);
  pinMode(3, OUTPUT);
}

void loop() 
{
  //El led parpadea cada 250 ms.
  digitalWrite(3, HIGH);
  delay(250);
  digitalWrite(3, LOW);
  delay(250);

  //El buzzer toma la frecuencia de distintas notas musicales.

  tone(2,523.25,1000); //DO
  delay(250);
  tone(2, 587.33, 1000); //RE
  delay(250);
  tone(2, 659.26 ,1000); //MI
  delay(250);
  tone(2,698.46 ,1000); //FA
  delay(250);
  tone(2, 783.99, 1000); //SOL
  delay(250);
  tone(2,880,1000); //LA
  delay(250);
  tone(2, 987.77 ,1000); //SI
  delay(250);
}