int state; 
// the setup funtion runs once when you press reset and or power the board
void setup() {
  //Define Pins
  #define LED D0
  #define button 27

  //Initilize pins
  pinMode(LED, INPUT); // Define button as an input
  pinMode(button, OUTPUT); // Define LED as an ouput
}

// the loop funtion runs over and over again forever
void loop() {
  state=digitalRead(button);
  //Write a Pin
  if(state==HIGH) // 
  {
    digitalWrite(LED,HIGH); // If the button is pressed, the LED lights up
  }
  else{
    digitalWrite(LED,LOW); // If the button is released, the LED turns off
  }
}