#include <Servo.h>

#define SERVO_PIN 9
#define PIR_SENSOR_PIN 2

Servo gasRegulatorServo; // Declare the servo object

int seconds = 0;
int pirState = LOW; // by default, no motion detected

int redLED = 4;
int greenLED = 3;
int buzzer = 5;

void setup() {
  pinMode(PIR_SENSOR_PIN, INPUT);
  pinMode(redLED, OUTPUT);
  pinMode(greenLED, OUTPUT);
  pinMode(buzzer, OUTPUT);
  gasRegulatorServo.attach(SERVO_PIN); // Attach the servo to the pin
  lcd.backlight();
  lcd.display();
  lcd.begin(16, 2);
  lcd.clear();
  Serial.begin(9600);
}

void loop() {
  pirState = digitalRead(PIR_SENSOR_PIN);
  if (pirState == HIGH) { // check if motion detected
    lcd.setCursor(0, 0);
    lcd.print("Kondisi Ruangan:");
    lcd.setCursor(0, 1);
    lcd.print("Orang ada!      ");
    digitalWrite(redLED, HIGH);
    digitalWrite(greenLED, LOW);
    tone(buzzer, 750, 1000);
    closeGasRegulator();
  } else {
    lcd.setCursor(0, 0);
    lcd.print("Kondisi Ruangan:");
    lcd.setCursor(0, 1);
    lcd.print("Orang tidak ada  ");
    digitalWrite(redLED, LOW);
    digitalWrite(greenLED, HIGH);
    noTone(buzzer);
    openGasRegulator();
  }
  delay(1000); // Jeda Waktu 1 detik u/ pembacaan berikutnya
}

void openGasRegulator() {
  gasRegulatorServo.write(90);
}

void closeGasRegulator() {
  gasRegulatorServo.write(0);
}