int EN = 7;
int STEP = 6;
int DIR = 5;

void setup(){
 pinMode(EN, OUTPUT);
 pinMode(STEP, OUTPUT);
 pinMode(DIR, OUTPUT);
digitalWrite(EN,LOW);
}
void loop(){
  digitalWrite(DIR, LOW);
  for(int x = 0; x < 200; x++){
  digitalWrite(STEP, HIGH);
delay(10);
digitalWrite(STEP, LOW);
delay(10);
}
delay(500);
digitalWrite(DIR, HIGH);
for(int x = 0; x < 400; x++){
  delay(10);
  digitalWrite(STEP, HIGH);
delay(10);
digitalWrite(STEP, LOW);
delay(10);
}
delay(500);
}