#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x27, 20, 4);

void setup() {
  lcd.init();
  lcd.backlight();
  lcd.setCursor(1, 0);
  lcd.print("Ready!!");
  delay(500);
  pinMode(2, INPUT);
  Serial.begin(9600);
}

void loop() {
  int pir = digitalRead(2);
  Serial.println(pir);
  delay(500);
  if (pir == 1) {
    lcd.setCursor(1, 0);
    lcd.print("Warning !!");
  }else{
    lcd.setCursor(1, 0);
    lcd.print("Running");
  }
}