#include <SPI.h>
#include <MFRC522.h>
#include <Wire.h>
#include <LiquidCrystal_I2C.h>

#define SS_PIN 10
#define RST_PIN 9

MFRC522 rfid(SS_PIN, RST_PIN);
LiquidCrystal_I2C lcd(0x27, 16, 2);

// UID kartu yang diizinkan (ubah sesuai UID kartu kamu)
byte allowedUID[4] = {0x01, 0x02, 0x03, 0x04};

void setup() {

  Serial.begin(9600);
  SPI.begin();
  rfid.PCD_Init();

  lcd.init();
  lcd.backlight();

  lcd.setCursor(0,0);
  lcd.print("Tempel Kartu");
}

void loop() {

  if (!rfid.PICC_IsNewCardPresent()) return;
  if (!rfid.PICC_ReadCardSerial()) return;

  Serial.print("UID Kartu: ");

  for (byte i = 0; i < rfid.uid.size; i++) {
    Serial.print("0x");
    Serial.print(rfid.uid.uidByte[i], HEX);
    Serial.print(" ");
  }

  Serial.println();

  bool akses = true;

  for (byte i = 0; i < 4; i++) {
    if (rfid.uid.uidByte[i] != allowedUID[i]) {
      akses = false;
    }
  }

  lcd.clear();

  if (akses) {
    lcd.setCursor(0,0);
    lcd.print("Akses");
    lcd.setCursor(0,1);
    lcd.print("Diterima");
  } 
  else {
    lcd.setCursor(0,0);
    lcd.print("Akses");
    lcd.setCursor(0,1);
    lcd.print("Ditolak");
  }

  delay(2000);

  lcd.clear();
  lcd.setCursor(0,0);
  lcd.print("Tempel Kartu");

  rfid.PICC_HaltA();
}