#define EN PIN 6
#define DIR_X 4
#define STEP_X 5
int step_rev = 3200; 
int dir = 1;
void setup(){
  pinMode(EN_PIN, OUTPUT);
  pinMode (DIR_X, OUTPUT);
  pinMode (STEP_X, OUTPUT) ;
  Serial. begin (115200);
}

void loop(){
  digitalWrite(EN_PIN, LOW);
  if(dir > 0);{
    digitalWrite(DIR_X, LOW);
    for (int 1=0; I<step_rev, i++){
      digitalWrite(STEP_X, HIGH);
      delay(1);
      digitalWrite(STEP_X, LOW);
      delay (1) ;
    }
    delay (2000) ;
    dir = -1;
  } else {
    digitalWrite(DIR_X, HIGH) ;
    for (int i-0; i‹step_rev: i++){
      digitalWrite(STEP_X, HIGH):
      delay (1) ;
      digitalWrite(STEP_X, LOW) ;
      delay (1) ;
    }
    delay (2000) ;
    dir - 1;
  }
}