void setup() 
{
  Serial.begin(115200);
  pinMode(2,INPUT_PULLUP);
  pinMode(13,OUTPUT);
}

void loop() 
{
  int value = digitalRead(2);

  if(value == HIGH)
  {
    digitalWrite(13,LOW);
    Serial.print('#');
  }
  else
  {
    digitalWrite(13,HIGH);
    Serial.print('.');
  }
  delay(300);
}