#include <MQ2.h>
#include  <Wire.h>
#include  <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27, 20,4); 

//change this with the pin that you use
int pin = 5;
float lpg, co, smoke;

MQ2 mq2(pin);

void setup(){

  Serial.begin(115200);
  lcd.begin();
  lcd.backlight();
  delay(250);
  lcd.noBacklight();
  delay(250);
  lcd.backlight();
 
  lcd.setCursor(0,0);
  lcd.print("Fablab Kamakura");
  delay(1000);
  lcd.setCursor(0,1);
  lcd.print("Setyawan UGM");
  delay(2000);
      lcd.clear();  
  // calibrate the device
  mq2.begin();
}

void loop(){
  
  /*
   * read the values from the sensor, it returns
   * an array which contains 3 values.
   * 0 : LPG in ppm
   * 1 : CO in ppm
   * 2 : SMOKE in ppm
   */
  float* values= mq2.read(true); //set it false if you don't want to print the values to the Serial
  
  // lpg = values[0];
  lpg = mq2.readLPG();
   lcd.setCursor(0,0);
  lcd.print("LPG(ppm)  :");
  lcd.setCursor(11,0);
  lcd.print(lpg);
  
  // co = values[1];
  co = mq2.readCO();
    lcd.setCursor(0,1);
  lcd.print("CO(ppm)   :");
  lcd.setCursor(11,1);
  lcd.print(co); 
  
  // smoke = values[2];
  smoke = mq2.readSmoke();
  lcd.setCursor(0,2);
  lcd.print("Smoke(ppm):");
  lcd.setCursor(11,2);
  lcd.print(smoke); 
   delay(1000);
}