hu// Pn connected to the LED

void setup() {
  pinMode(1, OUTPUT);
  pinMode(2, OUTPUT);
  pinMode(3, OUTPUT);
  pinMode(4, OUTPUT);
  

  void loop() {
  digitalWrite(1, HIGH);
  digitalWrite(2, LOW);
  digitalWrite(3, LOW);
  digitalWrite(4, LOW);
  delay(500); // kecepatan kedip 0,5 dtik



  digitalWrite(1, LOW);
  digitalWrite(2, HIGH);
  digitalWrite(3, LOW);
  digitalWrite(4, LOW);
  delay(500); // kecepatan kedip 0,5 detik



  digitalWrite(1, LOW) ;
  digitalWrite(2, LOW) ;
  digitalWrite(3, HIGH) ;
  digitalWrite(4, LOW) ;
  delay(500) ; // kecepatan kedip 0,5 detik



  digitalWrite(1, LOW) ;
  digitalWrite(2, LOW) ;
  digitalWrite(3, LOW) ;
  digitalWrite(4, HIGH) ;
  delay(500) ; // kecepatan kedip 0,5 detik
  }












   





}