const int blueLed = 4;          // Blue LED for system active indicator
const int greenLed = 5;         // Green LED (currently unused)
const int doors = 2;            // Door sensor input
const int mainSwitch = 3;       // Main switch input
const int alarm = 12;           // Alarm output

// Duration for alarm to sound (in milliseconds)
const int alarmDuration = 5000; // Adjust as needed

void setup() {
  pinMode(mainSwitch, INPUT_PULLUP);  // Set up switch with internal pull-up resistor
  pinMode(doors, INPUT_PULLUP);      // Set up door sensor with internal pull-up resistor
  pinMode(greenLed, OUTPUT);         // Set up LEDs as outputs
  pinMode(alarm, OUTPUT);
  pinMode(blueLed, OUTPUT);

  digitalWrite(alarm, LOW);         // Ensure alarm starts off initially
}

void loop() {
  int switchState = digitalRead(mainSwitch);
  int doorState = digitalRead(doors);

  // If the main switch is on, activate the system
  if (switchState == HIGH) {
    digitalWrite(blueLed, HIGH);   // Turn on blue LED to signal active system

    // If the door is open, trigger the alarm
    if (doorState == LOW) {
      digitalWrite(alarm, HIGH);   // Turn on the alarm
      delay(alarmDuration);        // Sound the alarm for the specified duration
      digitalWrite(alarm, LOW);    // Turn off the alarm after the duration
    } else {
      digitalWrite(alarm, LOW);    // Keep the alarm off if the door is closed
    }
  } else {
    digitalWrite(blueLed, LOW);    // Turn off blue LED if the system is disarmed
    digitalWrite(alarm, LOW);      // Ensure alarm is off when the system is off
  }
}