#define DIR_PIN 2        
#define STEP_PIN 3      

#define STEPS_PER_REV 200   
#define FORWARD_DELAY 5     
#define REVERSE_DELAY 2    
#define PAUSE_BETWEEN 500   


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


void loop() {
  
  digitalWrite(DIR_PIN, HIGH);             
  rotateStepper(STEPS_PER_REV, FORWARD_DELAY); 

  delay(PAUSE_BETWEEN);                     

  
  digitalWrite(DIR_PIN, LOW);                
  rotateStepper(STEPS_PER_REV, REVERSE_DELAY); 

  delay(PAUSE_BETWEEN);                      
}


void rotateStepper(int steps, int stepDelay) {
  for (int i = 0; i < steps; i++) {
    digitalWrite(STEP_PIN, HIGH);             
    delayMicroseconds(stepDelay * 1000);      
    digitalWrite(STEP_PIN, LOW);              
    delayMicroseconds(stepDelay * 1000);     
  }
}