int buttonInput;
byte state = B00000001;
byte originalState = state;  // Store the original state

unsigned long debounce = 50;
unsigned long lastChange = millis();
unsigned long prevMillis = 0;
const long waktu = 500;
boolean ledShiftEnabled = false;  // Flag to control LED shifting

void setup() {
  // Set pin 8 as input
  pinMode(8, INPUT_PULLUP);
  DDRD = B11111111;
  buttonInput = digitalRead(8);  
}

void loop() {
  if(millis() - lastChange >= debounce){
    byte buttonState = digitalRead(8);
    if(buttonState != buttonInput){
      lastChange = millis();
      buttonInput = buttonState;
      
      if (buttonInput == HIGH) {
        // Toggle the LED shifting flag when the button is pressed
        ledShiftEnabled = !ledShiftEnabled;
      }
    }
    
    if (ledShiftEnabled) {
      unsigned long currentMillis = millis();  // Get the current time
      
      // Check if it's time to shift the state
      if (currentMillis - prevMillis >= waktu) {
        state = state << 1;  // Shift the state to activate the next LED
        if (state == 0) {
          state = originalState;  // Reset the state to its original value if it becomes zero
        }
        prevMillis = currentMillis;  // Update the previous time
      }
      
      // Update LEDs based on the state
      PORTD = state;  // Write the state to the port connected to the LEDs
    }
  }
}