void setup() {

  pinMode(2, OUTPUT);
  pinMode(3, OUTPUT);
  pinMode(4, OUTPUT);
  pinMode(5, OUTPUT);
}

void loop() {
 
  int dtime = 100;
 
  digitalWrite(2, HIGH);
  delay(dtime);
  digitalWrite(2, LOW);



  digitalWrite(3, HIGH);
  delay(dtime);
  digitalWrite(3, LOW);


  digitalWrite(4, HIGH);
  delay(dtime);
  digitalWrite(4, LOW);


  digitalWrite(5, HIGH);
  delay(dtime);
  digitalWrite(5, LOW);
  
}