#include <Keypad.h>
#include <LiquidCrystal.h>
#include <SD.h>
#include <RTClib.h>

const int buzzerPin = 9;
const String validCardNumber = "9876543210123456";
const String validPin = "4321";

Keypad keypad = ...; // Initialize keypad
LiquidCrystal lcd(...); // Initialize LCD
RTC_DS1307 rtc; // Initialize RTC
File logFile;

void setup() {
    Serial.begin(9600);
    lcd.begin(16, 2);
    pinMode(buzzerPin, OUTPUT);
    SD.begin(4); // Initialize SD card
    rtc.begin(); // Initialize RTC
}

void loop() {
    // Logic for entering card number and PIN
    // Validate and check for suspicious activities
    // Log transactions with timestamp and alert if necessary
}