---

const int BUTTON_PIN = 8;      
const int EXT_LED_PIN = 7;      

void setup() {
  pinMode(BUTTON_PIN, INPUT_PULLUP); 
  pinMode(EXT_LED_PIN, OUTPUT);        
}

void loop() {
  bool buttonState = digitalRead(BUTTON_PIN);

  if (buttonState == LOW) {
    digitalWrite(LED_BUILTIN, HIGH);
    digitalWrite(EXT_LED_PIN, LOW);
  } 
  else {
    digitalWrite(LED_BUILTIN, LOW);       
    digitalWrite(EXT_LED_PIN, HIGH);
    delay(300);
    digitalWrite(EXT_LED_PIN, LOW);
  }
}