byte led = 3;
byte pulsador = 7;
byte lectura = 0;


void setup() {
  pinMode(led, OUTPUT); 
  pinMode(pulsador, OUTPUT); 
}


void loop() {
  lectura=digitalRead(pulsador);
  if(lectura==1){
    digitalWrite(led, HIGH);
  }
  else{
  digitalWrite(led, LOW);  
  }
}