const int pinBoton = 8;     // the number of the pushbutton pin
const int pinLed =  3;      // the number of the LED pin
int estadoBoton = 0;         // variable for reading the pushbutton status
void setup() { 
  pinMode(pinLed, OUTPUT);
  pinMode(pinBoton, INPUT);
}

void loop() {
  estadoBoton = digitalRead(pinBoton);
  if (estadoBoton == LOW) {
    digitalWrite(pinLed, LOW);
  } else {
    digitalWrite(pinLed, HIGH);
  }
}