#define RED 12
#define GREEN 11
#define BTN1 8



void setup() {
  pinMode(BTN1, INPUT);
  pinMode(RED, OUTPUT);
    pinMode(BTN1, INPUT_PULLUP);

}

void loop() {
    if (digitalRead(BTN1)) {
      digitalWrite(RED, LOW);
      delay(200);

    } else {
      digitalWrite(RED, HIGH);
      delay(200);

    }

}