#define DIR_PIN 2
#define STEP_PIN 3

void setup() {
  pinMode(STEP_PIN, OUTPUT);
  pinMode(DIR_PIN, OUTPUT);
  digitalWrite(STEP_PIN, LOW);
}

void loop() {
  digitalWrite(DIR_PIN, HIGH);
  for (int i = 0; i < 200; i++) {
    digitalWrite(STEP_PIN, HIGH);
    digitalWrite(STEP_PIN, LOW);
    delay(5);
  }

  delay(500);
  digitalWrite(DIR_PIN, LOW);
  for (int i = 0; i < 200; i++) {
    digitalWrite(STEP_PIN, HIGH);
    digitalWrite(STEP_PIN, LOW);
    delay(2);
  }

  delay(1000);
}