#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27,16,2);
const int mq_s = A1;

void setup()
{
  Serial.begin(9600);
  pinMode(mq_s,INPUT);
  lcd.init();
  lcd.backlight();
}
void loop() 
{
 int sensor_value=analogRead(mq_s);
 Serial.println("smoke value ");
 Serial.print(sensor_value);
 delay(2000);
 lcd.setCursor(0,1);
 lcd.print("smoke value ");
 lcd.println(sensor_value);
 delay(1000);
}