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

#define Board ("ESP-32")
#define Pin   (4)
#define Threshold (23)
#define Type    ("MQ-2")
#define Voltage_Resolution  (3.3)
#define ADC_Bit_Resolution  (12)
#define RatioMQ2CleanAir  (9.83)

// MQ2 Library Instance Setup
MQUnifiedsensor MQ2(Board, Voltage_Resolution, ADC_Bit_Resolution, Pin, Type);

// Display Setup
LiquidCrystal_I2C lcd(0x27, 16, 2);

// Variables
int gas_value = 0;

void setup() {
  lcd.init();
  lcd.begin(16, 2);
  lcd.backlight();
  lcd.clear();
  lcd.print("Gas Sensor");
  delay(1000);

  Serial.begin(9600);
  // Set Parameters to detect PPM concentration for LPG
  MQ2.setRegressionMethod(1);
  MQ2.setA(574.25);
  MQ2.setB(-2.222);
  MQ2.init();


  Serial.println("Hello, ESP32!");
}

void loop() {
  // put your main code here, to run repeatedly:
  delay(10); // this speeds up the simulation
}