#define btn 5
#define LED 12

void setup() {
  // put your setup code here, to run once:
  pinMode(LED, OUTPUT);
  pinMode(btn, INPUT);
}

void loop() {
  // put your main code here, to run repeatedly
  bool state = digitalRead(btn);
  if (state == true)
  {
    digitalWrite(LED, HIGH);
  }
  else
  {
    digitalWrite(LED, LOW);
  }
}