#define Step_pin 16
#define Dir_pin 17
#define speed 5000

const int stepsPerRevolutions = 200;

void setup() {
  // put your setup code here, to run once:
  pinMode(Step_pin,OUTPUT);
  pinMode(Dir_pin, OUTPUT);

  digitalWrite(Dir_pin, HIGH);  //set initial direction to clockwise
}

void loop() {
  // put your main code here, to run repeatedly:
  for (int i = 0; i < stepsPerRevolutions; i++) {
    digitalWrite(Step_pin, HIGH);
    delayMicroseconds(speed);    //adjust this to control motor speed
    digitalWrite(Step_pin, LOW);
    delayMicroseconds(speed);
  }

  delay(1000);      //wait for 1 second

  digitalWrite(Dir_pin, LOW);   //change direction to anti-clockwise

  for (int i = 0; i < stepsPerRevolutions; i++) {
    digitalWrite(Step_pin, HIGH);
    delayMicroseconds(speed);    //adjust this to control motor speed
    digitalWrite(Step_pin, LOW);
    delayMicroseconds(speed);
  }

  delay(1000);    //wait for 1 second before loop
  digitalWrite(Dir_pin, HIGH);
}