const int pulsadorPin=2;
const int ledPin = 4;
int valorPulsador = 0;

void setup() {
  // put your setup code here, to run once:
  pinMode(pulsadorPin, INPUT);
  pinMode(ledPin , OUTPUT);

}

void loop() {
  // put your main code here, to run repeatedly:
  valorPulsador = digitalRead(pulsadorPin);

  if(valorPulsador == HIGH){
    digitalWrite(ledPin , HIGH);
  }
  else{
    digitalWrite(ledPin, LOW);
  }

}