int lampu1 = 7;
  int lampu2 = 6;
  int lampu3 = 5;
  int lampu4 = 4;
  int lampu5 = 3;
  
  void setup() {
    Serial.begin(9600);
    pinMode(lampu1, OUTPUT);
    pinMode(lampu2, OUTPUT);
    pinMode(lampu3, OUTPUT);
    pinMode(lampu4, OUTPUT);
    pinMode(lampu5, OUTPUT);

}

void loop() {
  digitalWrite(lampu1, HIGH);
  delay(90);
  digitalWrite(lampu1, LOW);
  delay(90);

  digitalWrite(lampu2, HIGH);
  delay(90);
  digitalWrite(lampu2, LOW);
  delay(90);

  digitalWrite(lampu3, HIGH);
  delay(90);
  digitalWrite(lampu3, LOW);
  delay(90);
  
  digitalWrite(lampu4, HIGH);
  delay(90);
  digitalWrite(lampu4, LOW);
  delay(90);

  digitalWrite(lampu5, HIGH);
  delay(90);
  digitalWrite(lampu5, LOW);
  delay(90);

  digitalWrite(lampu4, HIGH);
  delay(90);
  digitalWrite(lampu4, LOW);
  delay(90);

  digitalWrite(lampu3, HIGH);
  delay(90);
  digitalWrite(lampu3, LOW);
  delay(90);
  
  digitalWrite(lampu2, HIGH);
  delay(90);
  digitalWrite(lampu2, LOW);
  delay(90);
}