void setup() {
  // put your setup code here, to run once:
  // Led 1A = Anode beraliran positif (+)
  // Led 1C = Catode beraliran negatif (-)
pinMode(4, OUTPUT);
pinMode(3, OUTPUT);
pinMode(2, OUTPUT);

}

void loop() {
  // put your main code here, to run repeatedly:
  digitalWrite(4,HIGH);
  delay(1000);
  digitalWrite(4,LOW);
  delay(1000);
  digitalWrite(3,HIGH);
  delay(1000);
  digitalWrite(3,LOW);
  delay(1000);
  digitalWrite(2,HIGH);
  delay(1000);
  digitalWrite(2,LOW);
  delay(1000);
}