#include <LiquidCrystal_I2C.h>

int lcdColumns = 16;
int lcdRows = 2;
int ledPin = 23;
int buzzPin = 18;
int pirState = LOW;
int val = 0;

LiquidCrystal_I2C lcd(0x27, lcdColumns, lcdRows);

void setup() {
  pinMode(buzzPin, OUTPUT);
  pinMode(ledPin, OUTPUT);
  pinMode(inputPin, INPUT);
  lcd.init();
  lcd.backlight();
}

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

  if (val = HIGH) {
    digitalWrite(ledPin, LOW);
    digitalWrite(buzzerPin, HIGH);
    tone(buzzerPin, 100, 6000);

    lcd.setCursor(0, 0)
    lcd.print("Motion Detected!");
    delay(1000);
  }
}