#define P1 4
#define P2 5
#define P3 6
#define P4 7

void setup()  {
  pinMode(P1,OUTPUT);
  pinMode(P2,OUTPUT);
  pinMode(P3,OUTPUT);
  pinMode(P4,OUTPUT);

    int steppause=4;
  for (int i=0; i<2048; i++){
  digitalWrite(P1,HIGH);
  digitalWrite(P2,LOW);
  digitalWrite(P3,LOW);
  digitalWrite(P4,LOW);
  delay(steppause);
  digitalWrite(P1,LOW);
  digitalWrite(P2,HIGH);
  digitalWrite(P3,LOW);
  digitalWrite(P4,LOW);
  delay(steppause);
  digitalWrite(P1,LOW);
  digitalWrite(P2,LOW);
  digitalWrite(P3,HIGH);
  digitalWrite(P4,LOW);
  delay(steppause);
  digitalWrite(P1,LOW);
  digitalWrite(P2,LOW);
  digitalWrite(P3,LOW);
  digitalWrite(P4,HIGH);
  delay(steppause);
  }

}

void loop() {


}