const int SW1 = 12; 
const int IR1 = 14; 
const int IR2 = 27; 
const int LED1 = 5; 
const int LED2 = 18;

void setup() {
  pinMode(LED1, OUTPUT);
  pinMode(LED2, OUTPUT);
  
  // Guna PULLUP supaya tak nyala sendiri (Floating)
  pinMode(SW1, INPUT_PULLUP);
  pinMode(IR1, INPUT_PULLUP);
  pinMode(IR2, INPUT_PULLUP);
}

void loop() {
  int s1 = digitalRead(SW1);
  int i1 = digitalRead(IR1);
  int i2 = digitalRead(IR2);

  // 1. Cek SW1 == 1 (Ditekan)
  if (s1 == LOW) {
    digitalWrite(LED1, HIGH); 
    digitalWrite(LED2, LOW);
  } 
  else {
    digitalWrite(LED1, LOW); 
    
    // 2. Cek IR1 == 1 DAN IR2 == 1 (Dua-dua ditekan)
    if (i1 == LOW && i2 == LOW) {
      digitalWrite(LED2, HIGH);
      delay(200);
      digitalWrite(LED2, LOW);
      delay(200);
    }
    // 3. Cek IR1 == 0 DAN IR2 == 0 (Dua-dua tak ditekan)
    else if (i1 == HIGH && i2 == HIGH) {
      digitalWrite(LED2, HIGH); 
    }
    // 4. Selain itu (No)
    else {
      digitalWrite(LED2, LOW); 
    }
  }
}