int btn_new = 12;
int btn_old = 2;
int led = 4;
bool btnState_new = false;
bool btnState_old = false;
void setup() {
  // put your setup code here, to run once:
  pinMode(LED_BUILTIN, OUTPUT);
  pinMode(btn_new, INPUT_PULLUP);
  pinMode(btn_old, INPUT);
  Serial.begin(9600);
}

void loop() {
  // put your main code here, to run repeatedly:
  digitalWrite(LED_BUILTIN, HIGH);

  btnState_new = !digitalRead(btn_new);
  btnState_old = digitalRead(btn_old);

  Serial.println(btnState_old);


  if(btnState_new == HIGH){
    digitalWrite(led, HIGH);
  }else{
    digitalWrite(led, LOW);
  }
}