#include <SPI.h>
#include <MFRC522.h>
#include <LiquidCrystal.h>

#define SS_PIN 10
#define RST_PIN 9
#define BUZZER 8

MFRC522 rfid(SS_PIN, RST_PIN);
LiquidCrystal lcd(7, 6, 5, 4, 3, 2);

void setup() {
  SPI.begin();
  rfid.PCD_Init();

  pinMode(BUZZER, OUTPUT);

  lcd.begin(16, 2);
  lcd.print("Scan Card...");
}

void loop() {
  if (!rfid.PICC_IsNewCardPresent()) return;
  if (!rfid.PICC_ReadCardSerial()) return;
  
  lcd.clear();
  lcd.print("Present!");

  digitalWrite(BUZZER, HIGH);
  delay(200);
  digitalWrite(BUZZER, LOW);

  delay(2000);
  lcd.clear();
  lcd.print("Scan Card...");
}