#define LED1 18 
const int button = 15;
int buttonstatus=0;

void setup() {
  pinMode(LED1, OUTPUT);
  pinMode(button, INPUT);
}

void loop() {
  buttonstatus= digitalRead(button);
  if (buttonstatus == HIGH)
  {
    digitalWrite (LED1, HIGH);
  } else {
    digitalWrite(LED1, LOW);
  }
}