#define MQ2_ANA A1
#define LED 8
#define r1 7
#define BUTTON 13  // Pin untuk push button

#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcdku(0x27, 16, 2);
const int Buzzer = 6; 
int LEDM = 2;
int LEDH = 4;
int nilaimq = 186; 
bool isActivated = false;  // Status aktivasi

void setup() {
  Serial.begin(9600);
  pinMode(MQ2_ANA, INPUT);
  pinMode(LEDM, OUTPUT); 
  pinMode(LEDH, OUTPUT);  
  pinMode(Buzzer, OUTPUT);
  pinMode(r1, OUTPUT);
  pinMode(LED, OUTPUT);
  pinMode(BUTTON, INPUT_PULLUP);  // Push button sebagai input dengan pull-up resistor
  lcdku.init();
  lcdku.backlight();
  lcdku.setCursor(0,0);
  lcdku.print("DETEKSI KUALITAS UDARA");
  lcdku.setCursor(1,0);
  lcdku.print("By: Kel 4"); 
  delay(1000);
  lcdku.clear(); 
}

void loop() {
  // Membaca status tombol
  bool buttonState = digitalRead(BUTTON);

  if (buttonState == LOW) {  // Tombol ditekan
    isActivated = !isActivated;  // Toggle status aktivasi
    delay(250);  // Debouncing sederhana
  }

  if (isActivated) {
    int analogSensor = analogRead(MQ2_ANA);

    Serial.print("pin A1: ");
    Serial.println(analogSensor);

    lcdku.setCursor(0, 0);
    lcdku.print("Kadar Asap = ");
    lcdku.setCursor(12, 0);
    lcdku.print(analogSensor);

    delay(1000);

    if (analogSensor >= nilaimq) {
      digitalWrite(LEDM, HIGH); 
      digitalWrite(LEDH, LOW);
      tone(Buzzer, 1000);
      delay(100);
      digitalWrite(r1, HIGH);
      scrollText("Bahaya Asap Rokok", 0);
    } else {
      digitalWrite(LEDM, LOW); 
      digitalWrite(LEDH, HIGH);
      digitalWrite(r1, LOW);
      noTone(Buzzer);
      delay(500);
      scrollText("Udara Ruangan Aman", 0);
    }
    delay(1000);
    lcdku.clear();
  } else {
    // Ketika tidak aktif, matikan semua perangkat
    digitalWrite(LEDM, LOW); 
    digitalWrite(LEDH, LOW);
    digitalWrite(r1, LOW);
    noTone(Buzzer);
    lcdku.setCursor(0, 0);
    lcdku.print("Monitoring Off");
    delay(1000);
    lcdku.clear();
  }
}

void scrollText(String message, int row) {
  int len = message.length();
  lcdku.setCursor(0, row);
  lcdku.print(message);
  delay(500);

  for (int positionCounter = 0; positionCounter < len - 16; positionCounter++) {
    lcdku.scrollDisplayLeft();
    delay(250);
  }
}