RFID_Banking_System

// Include required libraries
#include <MFRC522.h>
#include <LiquidCrystal_I2C.h>
#include <Keypad.h>
#include <SPI.h>

// Create instances
LiquidCrystal_I2C lcd(0x27, 16, 2);
MFRC522 mfrc522(10, 9); // MFRC522 mfrc522(SS_PIN, RST_PIN)


char initial_password[4] = {'0', '8', '0', '6'};  // Variable to store initial password
String tagUID = "63 14 92 04";  // String to store UID of tag. Change it with your tag's UID
char password[4];   // Variable to store users password
boolean RFIDMode = true; // boolean to change modes
char key_pressed = 0; // Variable to store incoming keys
uint8_t i = 0;  // Variable used for counter
const int buzzer= 5;

// defining how many rows and columns our keypad have
const byte rows = 4;
const byte columns = 4;

// Keypad pin map
char hexaKeys[rows][columns] = {
  {'1', '2', '3', 'A'},
  {'4', '5', '6', 'B'},
  {'7', '8', '9', 'C'},
  {'*', '0', '#', 'D'}
};

// Initializing pins for keypad
byte row_pins[rows] = {A0, A1, A2, A3};
byte column_pins[columns] = {2, 1, 0};

// Create instance for keypad
Keypad keypad_key = Keypad( makeKeymap(hexaKeys), row_pins, column_pins, rows, columns);

void setup() {
  lcd.init();   // LCD screen
  lcd.backlight();
  SPI.begin();      // Init SPI bus
  mfrc522.PCD_Init();   // Init MFRC522
  pinMode(buzzer, OUTPUT);
  
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("-----NexGO------");
  lcd.setCursor(0, 1);
  lcd.print("BeyonD Payment's");
  
  delay(5000);
}

void loop() {
  // System will first look for mode
  if (RFIDMode == true) {
;

    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("Tap Your Card!");

    // Look for new cards
    if ( ! mfrc522.PICC_IsNewCardPresent()) {
      return;
    }

    // Select one of the cards
    if ( ! mfrc522.PICC_ReadCardSerial()) {
      return;
    }

    //Reading from the card
    String tag = "";
    for (byte j = 0; j < mfrc522.uid.size; j++)
    {
      tag.concat(String(mfrc522.uid.uidByte[j] < 0x10 ? " 0" : " "));
      tag.concat(String(mfrc522.uid.uidByte[j], HEX));
    }
    tag.toUpperCase();

    //Checking the card
    if (tag.substring(1) == tagUID)
    {
      // If UID of tag is matched.
      lcd.clear();
      
      tone(buzzer,2000);
      delay(200);
      noTone(buzzer);
      
      lcd.print("Card Detected :)");

      delay(1000);
 
      lcd.clear();
      lcd.print("Enter Pin:");
      lcd.setCursor(0, 1);
      RFIDMode = false; // Make RFID mode false
    }

    else
    {
      // If UID of tag is not matched.
      tone(buzzer,2000);
      delay(200);
      noTone(buzzer);
      
      lcd.clear();
      lcd.setCursor(0, 0);
      lcd.print("Processing");
      delay(250);
      lcd.setCursor(10, 0);
      lcd.print(".");
      delay(250);
      lcd.setCursor(11, 0);
      lcd.print(".");
      delay(250);
      lcd.setCursor(12, 0);
      lcd.print(".");
        
      delay(250);

      lcd.clear();
      lcd.setCursor(0, 0);
      lcd.print("Processing");
      delay(250);
      lcd.setCursor(10, 0);
      lcd.print(".");
      delay(250);
      lcd.setCursor(11, 0);
      lcd.print(".");
      delay(250);
      lcd.setCursor(12, 0);
      lcd.print(".");
       
      lcd.clear();
      
      lcd.setCursor(0, 0);
      lcd.print("Card Invalid!");
      
      tone(buzzer,5000);
      delay(400);
      noTone(buzzer);
      delay(800);
      
      lcd.clear();

      lcd.setCursor(0, 0);
      lcd.print("Please Scan a");
      lcd.setCursor(0, 1);
      lcd.print("Vaild Card.");

      delay(2000);
  
      lcd.clear();
    }
  }

  // If RFID mode is false, it will look for keys from keypad
  if (RFIDMode == false) {
    key_pressed = keypad_key.getKey(); // Storing keys
    if (key_pressed)
    {
      password[i++] = key_pressed; // Storing in password variable
      lcd.print("*");
    }
    if (i == 4) // If 4 keys are completed
    {
      delay(200);
      if (!(strncmp(password, initial_password, 4))) // If password is matched
      {
        lcd.clear();
        
        lcd.print("Pin Accepted.");
        
        tone(buzzer,2000);
        delay(200);
        noTone(buzzer);
        delay(500);

        lcd.clear();
        lcd.setCursor(0, 0);
        lcd.print("Processing");
        delay(250);
        lcd.setCursor(10, 0);
        lcd.print(".");
        delay(250);
        lcd.setCursor(11, 0);
        lcd.print(".");
        delay(250);
        lcd.setCursor(12, 0);
        lcd.print(".");
        
        delay(250);

        lcd.clear();
        lcd.setCursor(0, 0);
        lcd.print("Processing");
        delay(250);
        lcd.setCursor(10, 0);
        lcd.print(".");
        delay(250);
        lcd.setCursor(11, 0);
        lcd.print(".");
        delay(250);
        lcd.setCursor(12, 0);
        lcd.print(".");
        
        delay(500);
        lcd.clear();
        lcd.setCursor(0, 0);
        lcd.print("Transaction");
        lcd.setCursor(0, 1);
        lcd.print("Completed.");
        
        tone(buzzer,2000);
        delay(700);
        noTone(buzzer);
        
        delay(2000);
        
        lcd.clear();
        i = 0;
        RFIDMode = true; // Make RFID mode true
      }
      else    // If password is not matched
      {
        lcd.clear();
        lcd.setCursor(0, 0);
        lcd.print("Wrong Pin");
        lcd.setCursor(0, 1);
        lcd.print("Entered :(");
        
        tone(buzzer,5000);
        delay(500);
        noTone(buzzer);

        delay(3000);

        lcd.clear();
        i = 0;
        RFIDMode = true;  // Make RFID mode true
      }
    }
  }
}