const int stepPin = 5;
const int dirPin = 8;
void setup() {
  pinMode(5, OUTPUT);
  pinMode(8, OUTPUT);
}
void loop() {
  digitalWrite(8, HIGH);

  for(int x=0; x<100; x++){
    digitalWrite(5, HIGH);
    delayMicroseconds(100);
    digitalWrite(5, LOW);
    delayMicroseconds(100);
  }
  delay(1000);

  digitalWrite(8, LOW);

  for(int x=0; x<400; x++){
    digitalWrite(5, LOW);
    delayMicroseconds(100);
    digitalWrite(5, HIGH);
    delayMicroseconds(100);
  }
  delay(1000);
}