// Using NO library, but blocking loop

#define dirPin 2
#define stepPin 3
#define stepsPerRevolution 200

#define buttonPin 4
bool buttonState = 0;

void setup() {
  Serial.begin(115200);
  pinMode(dirPin, OUTPUT);
  pinMode(stepPin, OUTPUT);
  pinMode(buttonPin, INPUT);
  welcome();
}

void loop() {
  // Press button to start
  buttonState = digitalRead(buttonPin);
  if (buttonState == HIGH)
    step();
}

void step()
{
  int speed = 1900; // motor speed (min, max)
  int rotations = 1; // number of rotations +1 for non-zero
  int dir = 1; // direction 0 = CW or 1 = CCW

  digitalWrite(dirPin, dir);

  // Make one rotation
  for (int i = 0; i < rotations * stepsPerRevolution; i++) {
    digitalWrite(stepPin, HIGH);
    delayMicroseconds(speed);
    digitalWrite(stepPin, LOW);
    delayMicroseconds(speed);
  }
}

void welcome() {
  Serial.println("Press the button for one revolution. ");
}