void setup() {
  Serial.begin(9600);
  pinMode(8, OUTPUT);
  pinMode(9, OUTPUT); 
  pinMode(10, OUTPUT); 
  Serial.println("hallo king evann");
}

void loop() {
  if (Serial.available()) {
    String perintah = Serial.readStringUntil('\n');
    if (perintah == "on") {
      Serial.println("LED berkedip dari kiri ke kanan");

      digitalWrite(10, 1);
      delay(500);
      digitalWrite(10, 0);
      delay(500);

      digitalWrite(9, 1);
      delay(500);
      digitalWrite(9, 0);
      delay(500);

      digitalWrite(8, 1);
      delay(500);
      digitalWrite(8, 0);
      delay(500);
      
      Serial.println("Selesai berkedip");
    }
  }
}