#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#define sensor 4
#define buzzer 3

LiquidCrystal_I2C lcd(0x27, 20, 4);
int val = 0; //declare as global variable

void setup() {
  lcd.init(); //lcd start
  lcd.backlight(); //backlight start
  lcd.setCursor(1, 0);
  pinMode(sensor, INPUT);
  pinMode(buzzer, OUTPUT);
}

void loop() {
  val = digitalRead(sensor);

  if (val == HIGH) {
    tone(buzzer, 330);
    delay(500);
    noTone(buzzer);
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("SECURITY BREACHED!!");
    delay(500);
    lcd.clear();
  } else {
    lcd.setCursor(0, 0);
    lcd.print("ALARM ACTIVATED");
  }
  
  delay(1000);
}