const int button = 2;
const int led1 = 21;
const int led4 = 19;
const int led2 = 18;
const int led3 = 5;

int buttonState = LOW;
int lastButtonState = LOW;

void setup() {
  Serial.begin(115200);
  pinMode(button, INPUT);
  pinMode(led1, OUTPUT);
  pinMode(led4, OUTPUT);
  pinMode(led2, OUTPUT);
  pinMode(led3, OUTPUT);

  // Matikan semua LED saat awal
  digitalWrite(led1, LOW);
  digitalWrite(led4, LOW);
  digitalWrite(led2, LOW);
  digitalWrite(led3, LOW);
}

void loop() {
  buttonState = digitalRead(button);

  if (buttonState == HIGH) { // Tombol ditekan
    digitalWrite(led1, HIGH); // Nyalakan LED1
    digitalWrite(led4, LOW);  // Matikan LED4
    delay(500);
    digitalWrite(led4, HIGH); // Nyalakan LED1
    digitalWrite(led1, LOW);  // Matikan LED4
    delay(500);  
    digitalWrite(led2, HIGH); // Nyalakan LED1
    digitalWrite(led4, LOW);  // Matikan LED4
    delay(500);  
    digitalWrite(led3, HIGH); // Nyalakan LED1
    digitalWrite(led2, LOW);  // Matikan LED4
    delay(500);  
    
    digitalWrite(led3, LOW); // Nyalakan LED1
    delay(500);  
    digitalWrite(led3, HIGH); // Nyalakan LED1
    
    delay(500);
    digitalWrite(led2, HIGH); // Nyalakan LED1
    digitalWrite(led3, LOW);  // Matikan LED4
    delay(500);  
    digitalWrite(led4, HIGH); // Nyalakan LED1
    digitalWrite(led2, LOW);  // Matikan LED4
    delay(500);  
    digitalWrite(led1, HIGH); // Nyalakan LED1
    digitalWrite(led4, LOW);  // Matikan LED4
    delay(500);    
    
    
    
    } 
    digitalWrite(led4, LOW); // Nyalakan LED1
    digitalWrite(led1, LOW);  // Matikan LED4
    digitalWrite(led2, LOW);
    digitalWrite(led3, LOW);

 
  lastButtonState = buttonState;
}