int stato = LOW;
int old_stato = LOW;
int counter = 0;
void setup() {
  // put your setup code here, to run once:
  pinMode(2,OUTPUT);
  pinMode(3,OUTPUT);
  pinMode(4,OUTPUT);
  pinMode(5,OUTPUT);
  pinMode(11,INPUT);
  Serial.begin(9600); //Inizializzazione porta seriale
  Serial.println("INIZIO");
  pinMode(13,OUTPUT); //Accensione in caso di pressione led
}

void loop() {
  // put your main code here, to run repeatedly:
  int i;
  //Serial.print("Il contatore e' ");
  //Serial.println(counter,DEC);
  stato = digitalRead(11);

  if(stato == HIGH){
   digitalWrite(13,HIGH);
  }else if(stato == LOW){
    digitalWrite(13,LOW);
  }



  if(old_stato != stato && stato == HIGH){
    counter++;
    Serial.print("Incremento a ");
    Serial.println(counter,DEC);
  }
  old_stato = stato;

  for(i = 0;i < 4;i++){
    if(counter % 4 == i){
       digitalWrite(2+i,HIGH);
    }else{
       digitalWrite(2+i,LOW);
    }
  }



}