const int button = 5 ;
const int LED = 6;
int button_test = 0;


void setup() {
  pinMode(button , INPUT_PULLUP);
  pinMode(LED , OUTPUT);
}

void loop() {

button_test=digitalRead(button);

 if (button_test == LOW) 
  {
      digitalWrite(LED,HIGH);
      delay(500);
      digitalWrite(LED,LOW);
      delay(500);
   } else {
      digitalWrite(LED,LOW);
   }
}