byte led1 = 13; // merah 
byte led2 = 12; // kuning 
byte led3 = 11; // hijau 
byte led4 = 10; // biru
byte led5 = 9;  // orange
byte led6 = 8;  // pink
byte led7 = 7;  // biru langit 
byte led8 = 6;  // putih
byte led9 = 5;  // ungu

void setup() {
  // Menetapkan semua pin LED sebagai output
    pinMode(led1, OUTPUT);
      pinMode(led2, OUTPUT);
        pinMode(led3, OUTPUT);
          pinMode(led4, OUTPUT);
            pinMode(led5, OUTPUT);
              pinMode(led6, OUTPUT);
                pinMode(led7, OUTPUT);
                  pinMode(led8, OUTPUT);
                    pinMode(led9, OUTPUT);
                    }

                    void loop() {
                      // Menyalakan LED secara berurutan dari led1 sampai led9
                        digitalWrite(led1, HIGH);
                          delay(500);
                            digitalWrite(led1, LOW);

                              digitalWrite(led2, HIGH);
                                delay(500);
                                  digitalWrite(led2, LOW);

                                    digitalWrite(led3, HIGH);
                                      delay(500);
                                        digitalWrite(led3, LOW);

                                          digitalWrite(led4, HIGH);
                                            delay(500);
                                              digitalWrite(led4, LOW);

                                                digitalWrite(led5, HIGH);
                                                  delay(500);
                                                    digitalWrite(led5, LOW);

                                                      digitalWrite(led6, HIGH);
                                                        delay(500);
                                                          digitalWrite(led6, LOW);

                                                            digitalWrite(led7, HIGH);
                                                              delay(500);
                                                                digitalWrite(led7, LOW);

                                                                  digitalWrite(led8, HIGH);
                                                                    delay(500);
                                                                      digitalWrite(led8, LOW);

                                                                        digitalWrite(led9, HIGH);
                                                                          delay(500);
                                                                            digitalWrite(led9, LOW);
                                                                            }