const int DIR=4;
const int STEP=3;
const int steps_per_rev=200;

void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  pinMode(STEP, OUTPUT);
  pinMode(DIR, OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
  digitalWrite(DIR, HIGH);
  Serial.println("Spinning Clockwise.....");

  for(int i=0;i<steps_per_rev;i++){
  digitalWrite(STEP, HIGH);
  delayMicroseconds(2000);
  digitalWrite(STEP, LOW);
  delayMicroseconds(2000);
  }
  delay(1000);
  digitalWrite(DIR, LOW);
  Serial.println("Spinning Anti-Clockwise.....");
  for(int i=0; i<steps_per_rev;i++){
  digitalWrite(STEP, HIGH);
  delayMicroseconds(2000);
  digitalWrite(STEP, LOW);
  delayMicroseconds(2000);
  }
  delay(1000);
}