#define PIN_LED 13
#define CONFIG_LED    pinMode(PIN_LED, OUTPUT)
#define ENCENDER_LED  digitalWrite(PIN_LED, HIGH)
#define APAGAR_LED    digitalWrite(PIN_LED, LOW)
#define MS_APAGADO    100
#define MS_ENCENDIDO  3000

#define PIN_BOTON 8
#define CONFIG_BOTON      pinMode(PIN_BOTON, INPUT)
#define BOTON_PRESIONADO  (digitalRead(PIN_BOTON)==HIGH)

void setup() {
  CONFIG_LED;
  CONFIG_BOTON;
  }

void loop() {
  if(!BOTON_PRESIONADO) return;

  ENCENDER_LED;
  delay(MS_APAGADO);
  APAGAR_LED;
  delay(MS_ENCENDIDO);
  }