// Inisialisasi Pin LED 
const int pinLED1 = 8; 
const int pinLED2 = 9; 
const int pinLED3 = 10; 
const int pinLED4 = 11;

void setup() {
// pin LED sebagai output 
pinMode(pinLED1, OUTPUT); 
pinMode(pinLED2, OUTPUT); 
pinMode(pinLED3, OUTPUT); 
pinMode(pinLED4, OUTPUT);
}
void loop() {
// perulangan sebanyak 5 kali 
for(int i=0; i<=5; i++){
  if(i==1){
    // jika i=1, hidupkan led 1 dan led 2,3,4 mati 
    digitalWrite(pinLED1, HIGH); 
    digitalWrite(pinLED2, LOW); 
    digitalWrite(pinLED3, LOW); 
    digitalWrite(pinLED4, LOW);
  } else if(i==2) {
  // jika i=2, hidupkan led 1 & 2, led 3 & 4 mati 
  digitalWrite(pinLED1, HIGH); 
  digitalWrite(pinLED2, HIGH);
  digitalWrite(pinLED3, LOW);
  digitalWrite(pinLED4, LOW);
  } else if(i==3) {
// jika i=3, hidupkan led 1, 2, & 3, led 4 mati 
digitalWrite(pinLED1, HIGH);
digitalWrite(pinLED2, HIGH);
digitalWrite(pinLED3, HIGH);
digitalWrite(pinLED4, LOW);
  } else if(i==4) {
// jika i=4, hidupkan semua led 
digitalWrite(pinLED1, HIGH);
digitalWrite(pinLED2, HIGH);
digitalWrite(pinLED3, HIGH);
digitalWrite(pinLED4, HIGH);
  } else {
// jika tidak, matikan semua led 
digitalWrite(pinLED1, LOW); 
digitalWrite(pinLED2, LOW); 
digitalWrite(pinLED3, LOW); 
digitalWrite(pinLED4, LOW);
}
// delay selama 3 detik
delay(3000);
}
}