#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#include <DHT.h>

#define DHT_PIN 2
int buzzer = 13;
int sensormq2 = A0;
int sensorThres1 = 400;
int sensormq7 = A1;
int sensorThres2 = 400;



DHT dht(DHT_PIN, DHT22);

LiquidCrystal_I2C lcd(0x27, 16, 2);

void setup() {
  Serial.begin(9600);
  dht.begin();
  lcd.init();
  lcd.backlight();
  pinMode(buzzer, OUTPUT);
  pinMode(mq2, INPUT); // pinmode buat mq 2 yaitu pin alanog A0
   pinMode(mq7, INPUT); // pinmode buat mq 7 yaitu pin alanog A1

}

void loop() {
  int suhu = dht.readTemperature();
  int kelembapan = dht.readHumidity();

  if(isnan(suhu) || isnan(kelembapan)){
    Serial.println("Sensor Rusak");
  } else {
    Serial.print("Sensor Ok ");


    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("T:");
    lcd.print(suhu);
    lcd.print("C");

    lcd.setCursor(9, 0);
    lcd.print("H:");
    lcd.print(kelembapan);
    lcd.print("%");

  }
    mq2();
  mq7();
  delay(1000);
}

void mq2() {
  int analogSensor = analogRead(sensormq2);

   lcd.setCursor(0, 1);
    lcd.print("mq2:");
    lcd.print(analogSensor);

  // Checks if it has reached the threshold value
  if (analogSensor > sensorThres1)
  {
   
    tone(buzzer, 1000, 200);
  }
  else
  {
  
    noTone(buzzer);
  }
  delay(100);
}

void mq7() {
  int analogSensor1 = analogRead(sensormq7);
 lcd.setCursor(9, 1);
    lcd.print("mq7:");
    lcd.print(analogSensor1);
  // Checks if it has reached the threshold value
  if (analogSensor1 > sensorThres2)
  {
   
    tone(buzzer, 1000, 200);
  }
  else
  {
  
    noTone(buzzer);
  }
  delay(100);
}