//CODIGO
void setup() {
  // put your setup code here, to run once:
  pinMode(3,OUTPUT);
}
 
void loop() {
  // put your main code here, to run repeatedly:
  digitalWrite(3,HIGH);  //enciende led
  delay(100);           //espera con led encendido
  digitalWrite(3,LOW);   //apaga led
  delay(100);           //espera con led apagado;
}