byte B[]={15, 2, 4, 16};
int Tiempo= 15000;
int g = 0;

void setup()
{
  for (byte i = 0; i < 4; i++)
  {
    pinMode(B[i], OUTPUT);
  }
}

void loop()
{
  Giros(30);
  delay(1000);
  Giros(60);
  delay(1000);
  Giros(90);
  delay(1000);
  Giros(120);
  delay(1000);
  Giros(-50);
  delay(1000);
}