int in1 = 11;
int in2 = 10;
int in3 = 9;
int in4 = 8;
int compteur = 0;
const int pause = 29.3;

void setup() {
  Serial.begin(9600);
  pinMode(in1, OUTPUT);
  pinMode(in2, OUTPUT);
  pinMode(in3, OUTPUT);
  pinMode(in4, OUTPUT);
  delay(1000);
}

void loop() {

  if ( compteur >= 2048 )
  {
  digitalWrite( in1, LOW );
  digitalWrite( in2, LOW );
  digitalWrite( in3, LOW );
  digitalWrite( in4, LOW );
  }
  else
  {
  digitalWrite( in1, HIGH );
  digitalWrite( in2, LOW );
  digitalWrite( in3, LOW );
  digitalWrite( in4, LOW );
  delay(pause);

  digitalWrite( in1, LOW );
  digitalWrite( in2, HIGH );
  digitalWrite( in3, LOW );
  digitalWrite( in4, LOW );
  delay(pause);

  digitalWrite( in1, LOW );
  digitalWrite( in2, LOW );
  digitalWrite( in3, HIGH );
  digitalWrite( in4, LOW );
  delay(pause);

  digitalWrite( in1, LOW );
  digitalWrite( in2, LOW );
  digitalWrite( in3, LOW );
  digitalWrite( in4, HIGH );
  delay(pause);

  compteur = compteur +4;
  Serial.print("pas = ");
  Serial.println(compteur);
  }
}