#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#include <MQ2.h> //library custom sensor gas MQ2
int pinAout=A0;
int lpg, co, smoke;
MQ2 mq2(pinAout);
LiquidCrystal_I2C lcd=LiquidCrystal_I2C(0x27, 16, 2); //alamat LCD 0x27 atau 0x3F, tipe LCD 16x2
void setup() 
{
  Serial.begin(9600);
  lcd.init();
  lcd.backlight();
  lcd.clear();
  mq2.begin();
}
void loop()
{
  //pembacaan ketiga gas sekaligus dalam satuan ppm
  //gas 1 : LPG, gas 2: CO, gas 3 : smoke
  float* values=mq2.read(true); //jika diset "false" tidak akan dimunculkan di serial monitor
  lpg = mq2.readLPG();
  co = mq2.readCO();
  smoke = mq2.readSmoke();
  lcd.setCursor(0,0);
  lcd.print("LPG:");
  lcd.print(lpg);
  lcd.print("CO:");
  lcd.print(co);
  lcd.setCursor(0,1);
  lcd.print("SMOKE:");
  lcd.print(smoke):
  lcd.print(" ppm");
  delay(1000);
}