// Inisialisasi pin LED
const int lampuLED1 = 8;
const int lampuLED2 = 9;
const int lampuLED3 = 10;
const int lampuLED4 = 11;
void setup() {
  // pin LED sebagai output
  pinMode(lampuLED1, OUTPUT);
  pinMode(lampuLED2, OUTPUT);
  pinMode(lampuLED3, OUTPUT);
  pinMode(lampuLED4, OUTPUT);
}
void loop() {
  digitalWrite(lampuLED1, LOW);
  digitalWrite(lampuLED2, LOW);
  digitalWrite(lampuLED3, LOW);
  digitalWrite(lampuLED4, LOW);
  delay(1000);
  digitalWrite(lampuLED1, HIGH);
  delay(1000);
  digitalWrite(lampuLED2, HIGH);
  delay(1000);
  digitalWrite(lampuLED3, HIGH);
  delay(1000);
  digitalWrite(lampuLED4, HIGH);
  delay(1000);
}