uint8_t wire1 = D8;
uint8_t wire2 = D7;
uint8_t wire3 = D6;
uint8_t wire4 = D5;

int minDelay = 3;




int seqNumber = 0;

const uint16_t _delay = 40; /* delay in between two steps. minimum delay more the rotational speed */
int currentDelay = 0;

void sequence(bool a, bool b, bool c, bool d){  /* four step sequence to stepper motor */
  digitalWrite(wire1, a);
  digitalWrite(wire2, b);
  digitalWrite(wire3, c);
  digitalWrite(wire4, d);
  delay(currentDelay);
}

void setup() {
  pinMode(wire1, OUTPUT); /* set four wires as output */
  pinMode(wire2, OUTPUT);
  pinMode(wire3, OUTPUT);
  pinMode(wire4, OUTPUT);
  Serial.begin(9600);
}

int onMegaSpeed = 0;

void loop() {
  if(seqNumber < 512){
    sequence(HIGH, LOW, LOW, LOW);
    sequence(LOW, HIGH, LOW, LOW);
    sequence(LOW, LOW, HIGH, LOW);
    sequence(LOW, LOW, LOW, HIGH);

    currentDelay = _delay - (seqNumber/2);
    currentDelay = currentDelay > minDelay ? currentDelay : minDelay;
    Serial.println(currentDelay);

    seqNumber++;

    if(currentDelay == minDelay){
      onMegaSpeed++;
    }
  }else if(seqNumber == 512){
    Serial.println("It's not even my final form.");
    seqNumber++;
  }
}




  /* Rotation in opposite direction */
/*  for(int j = 0; j<12; j++)
  {
    sequence(LOW, LOW, LOW, HIGH);
    sequence(LOW, LOW, HIGH, HIGH);
    sequence(LOW, LOW, HIGH, LOW);
    sequence(LOW, HIGH, HIGH, LOW);
    sequence(LOW, HIGH, LOW, LOW);
    sequence(HIGH, HIGH, LOW, LOW);
    sequence(HIGH, LOW, LOW, LOW);
    sequence(HIGH, LOW, LOW, HIGH);
  }
  sequence(LOW, LOW, LOW, HIGH);*/
//}