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

LiquidCrystal_I2C lcd(0x27, 16, 2);

int buz = 11;
int d = 0;

void setup()
{
  pinMode(buz, OUTPUT);
  Serial.begin(9600);
  lcd.init();
  lcd.init();
  lcd.backlight();
  lcd.setCursor(1, 0);
  lcd.print("Hello, world!");
  delay(5000);
  lcd.clear();
}

void loop()
{
  d = Serial.read();

  if (d == 'p' )
  {
    lcd.setCursor(0, 0);
    lcd.print("Status:");
    lcd.setCursor(0, 1);
    lcd.print("Fire Detected");
    digitalWrite(buz, 1);
    delay(800);
  }

  if (d == 's' )
  {
    lcd.setCursor(0, 0);
    lcd.print("Status:");
    lcd.setCursor(0, 1);
    lcd.print("   Safe         ");
    digitalWrite(buz, 0);
    delay(5);
  }

}