Stepper motor test code (Arduino)

stepper_motor_test.ino

int ccw = LOW;
int step = D5;
int dir = D6;
int startDelay = 1000;
int speed = 10;
int targetDelay = 350;

void setup()
{
  pinMode(step, OUTPUT);
  pinMode(dir, OUTPUT);
  Serial.begin(115200);
}

void loop()
{
  int sleepMicroseconds = startDelay;
  if (sleepMicroseconds > targetDelay)
  {
    digitalWrite(dir, ccw);
    sleepMicroseconds = sleepMicroseconds - speed;
    if(sleepMicroseconds % 100 == 0) {
      Serial.printf("%d\n", sleepMicroseconds);
    }
  }

  digitalWrite(step, HIGH);
  delayMicroseconds(sleepMicroseconds);
  digitalWrite(step, LOW);
  delayMicroseconds(sleepMicroseconds);
}