void setup() {
  Serial.begin(9600);

  pinMode(2, INPUT_PULLUP);
  pinMode(15, OUTPUT);
}

int prev = 0;

void loop() {
  Serial.print("98");
  int button = !digitalRead(2);

  if (prev != button)  {
    if (button) {
      digitalWrite(15, HIGH);
      Serial.print("98");
    } else {
      digitalWrite(15, LOW);
    }

    prev = button;
  }

  
  char currentSignal = Serial.available();
  if (!currentSignal) {
    return;
  }

  if (currentSignal == SECURITY_SYSTEM) {

  }
  
}