int led1 = 10; 
int led2 = 9;
int led3 = 8; 
int delayTime = 500; 

void setup() {
  pinMode(led1, OUTPUT);
  pinMode(led2, OUTPUT);
  pinMode(led3, OUTPUT);
  Serial.begin(9600); 
  Serial.println("Ketik 'berkedip' untuk memulai");
}

void loop() {
  if (Serial.available() > 0) { 
    String command = Serial.readStringUntil('\n'); 

    if (command == "berkedip") { 
      digitalWrite(led1, HIGH);
      delay(delayTime);
      digitalWrite(led1, LOW);

      digitalWrite(led2, HIGH);
      delay(delayTime);
      digitalWrite(led2, LOW);

      digitalWrite(led3, HIGH);
      delay(delayTime);
      digitalWrite(led3, LOW);

      Serial.println("LED telah berkedip dari LED 1 ke LED 3");
    }
  }
}