Testa Step

  int x;
//   -------------------------------------------
  void setup()
  {
    pinMode(6,OUTPUT);     // Enable
    pinMode(5,OUTPUT);     // Step
    pinMode(4,OUTPUT);     // Dir
    digitalWrite(6,LOW);   // Set Enable low
  }
 //   -------------------------------------------
  void loop()
  {
    digitalWrite(4,HIGH);      // Set Dir high
    for(x = 0; x < 200; x++)   // Loop 200 times
    {
      digitalWrite(5,HIGH);    // Output high
      delayMicroseconds(500);  // Wait 1/2 a ms
      digitalWrite(5,LOW);     // Output low
      delayMicroseconds(500);  // Wait 1/2 a ms
    }
      delay(1000);             // pause one second
      digitalWrite(4,LOW);     // Set Dir low
      for(x = 0; x < 200; x++) // Loop 2000 times
    {
      digitalWrite(5,HIGH);    // Output high
      delayMicroseconds(500);  // Wait 1/2 a ms
      digitalWrite(5,LOW);     // Output low
      delayMicroseconds(500);  // Wait 1/2 a ms
    }
    delay(1000); // pause one second
  }