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

#define         Board                   ("ESP-32")
#define         Pin                     (4)  // Analog input pin for MQ2 sensor
#define         Type                    ("MQ-2") // MQ2 gas sensor
#define         Voltage_Resolution      (3.3)
#define         ADC_Bit_Resolution      (12) // ADC resolution

MQUnifiedsensor MQ2(Board, Voltage_Resolution, ADC_Bit_Resolution, Pin, Type);
LiquidCrystal_I2C lcd(0x27, 16, 2); // LCD with I2C address 0x27

void setup() {
  lcd.init();  // Initialize LCD
  lcd.clear();
  lcd.backlight();  // Turn on the LCD backlight

  Serial.begin(9600); // Start serial communication for debugging

  // Initialize MQ2 sensor
  MQ2.init();  
}

void loop() {
  MQ2.update(); // Update the sensor data
  MQ2.readSensor(); // Read the sensor value
  
  int valor_gas = analogRead(Pin);  // Read the raw value from the analog pin
  valor_gas = map(valor_gas, 0, 4095, 0, 100); // Scale the value for display (0-100)

  lcd.clear();  // Clear the LCD
  lcd.setCursor(0, 0);  // Set cursor to the first line
  lcd.print("Gas Value: ");
  lcd.print(valor_gas); // Display the gas value (scaled)

  delay(500); // Delay for a half second
}