int btn1 = 12;
int btn2 = 6;
bool stavBtn1 = false;
bool stavBtn2 = false;

void setup() {
  // put your setup code here, to run once:
  pinMode(btn1, INPUT_PULLUP);
  pinMode(btn1, INPUT);
  pinMode(LED_BUILTIN, OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
  stavBtn1 = !digitalRead(btn1);
  if(stavBtn1){
    digitalWrite(LED_BUILTIN, HIGH);
  }else{
    digitalWrite(LED_BUILTIN, LOW);
  }

  stavBtn2 = digitalRead(btn2);
  Serial.println(stavBtn2);
}