Arduino 2-in-1 Door Lock System - RFID and PIN

RFID (Radio Frequency IDentification) has many real world applications. One of them is in locking and unlocking systems which scan the RFID tag and compare the information to the already stored information in the database and decide whether to unlock the door or not.

Such a system is designed by our team of four members (I, Hamza Ghaffar, Hamza Sumbal and Muhammad Bisaam) as an end semester project for the course "Electrical Network Analysis".


Video Demo:
The demonstration video is given below

Details are given in the following:

Components used:

An Arduino Mega 2560 board

An RFID RC522 module

A 4x4 keypad

A 16x2 Liquid Crystal Display for Arduino

A potentiometer

A breadboard

Jumper wires

Pin numbering of different components is given below:

Keypad	Arduino Mega 2560
4 row pins	2, 3, 4, 5
4 column pins	6, 7, 8, 9
LCD	Arduino Mega 2560
VSS	GND
VDD	5V
Vo	5V through potentiometer
RS(Reset)	24
RW	GND
E(Enable)	25
D4, D5, D6, D7 (data pins)	26, 27, 28, 29
A	5V through 330 ohm resistance
K	GND
RFID RC522 Module	Arduino Mega 2560
3.3V	3.3V
RST	48
GND	GND
SDA	53
SCK	52
MOSI	51
MISO	50
Green LED’s +ve terminal	40
Red LED’s +ve terminal	41

Arduino Code:

 /*  
 Fahad bin Khalid  
 Hamza Sumbal  
 Hamza Ghaffar  
 Muhammad Bisaam  
 */  
 #include <SPI.h>  
 #include <MFRC522.h>  
 #include <Keypad.h>  
 #include <LiquidCrystal.h>  
 const byte numRows= 4; //number of rows on the keypad  
 const byte numCols= 4; //number of columns on the keypad  
 //keymap defines the key pressed according to the row and columns just as appears on the keypad  
 char keymap[numRows][numCols]=   
 {  
 {'1', '2', '3', 'A'},   
 {'4', '5', '6', 'B'},   
 {'7', '8', '9', 'C'},  
 {'*', '0', '#', 'D'}  
 };  
 //Code that shows the the keypad connections to the arduino terminals  
 byte rowPins[numRows] = {2, 3, 4, 5}; //Rows 0 to 3  
 byte colPins[numCols]= {6, 7, 8, 9}; //Columns 0 to 3  
 //initializes an instance of the Keypad class  
 Keypad myKeypad= Keypad(makeKeymap(keymap), rowPins, colPins, numRows, numCols);  
 // initialize the library with the numbers of the interface pins  
 LiquidCrystal lcd(24, 25, 26, 27, 28, 29);  
 #define SS_PIN 53  
 #define RST_PIN 48  
 MFRC522 rfid(SS_PIN, RST_PIN); // Instance of the class  
 MFRC522::MIFARE_Key key;   
 // Init array that will store new NUID   
 byte nuidPICC[4];  
 byte knownTac0[4] = { 246,95,236,213};  
 byte knownTac1[4] = {150,014,65,59};  
 byte knownTac2[4] = {102,27,07,73};//!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!  
 boolean KNOW = true;  
 int id;//!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!  
 int redpin = 41;  
 int greenpin = 40;  
 void setup() {   
  Serial.begin(9600);  
  pinMode(redpin, OUTPUT);  
  pinMode(greenpin, OUTPUT);  
  // set up the LCD's number of columns and rows:  
  lcd.begin(16, 2);  
  SPI.begin(); // Init SPI bus  
  rfid.PCD_Init(); // Init MFRC522   
  // Print a message to the LCD and Serial.  
  lcd.clear();  
  lcd.print("Waiting for Card");  
  Serial.println("Waiting for Card");  
  digitalWrite(redpin, HIGH);  
 }  
 void loop() {  
  // Look for new cards  
  if ( ! rfid.PICC_IsNewCardPresent())  
   return;  
  // Verify if the NUID has been read  
  if ( ! rfid.PICC_ReadCardSerial())  
   return;  
  lcd.clear();  
  lcd.print("Card Detected");  
  Serial.println(F("Card Detected"));  
  delay(1000);  
  // Store NUID into nuidPICC array  
  for (byte i = 0; i < 4; i++) {  
   nuidPICC[i] = rfid.uid.uidByte[i];  
  }  
  // comparing IDs  
  if (knownTac0[0] == nuidPICC[0] &&  
    knownTac0[1] == nuidPICC[1] &&  
    knownTac0[2] == nuidPICC[2] &&  
    knownTac0[3] == nuidPICC[3]){  
    KNOW = true;  
    id =0 ; // first case  
  }  
  else if(knownTac1[0] == nuidPICC[0] &&  
      knownTac1[1] == nuidPICC[1] &&  
      knownTac1[2] == nuidPICC[2] &&  
      knownTac1[3] == nuidPICC[3]){  
    KNOW = true;  
    id = 1; // 2nd case  
  }  
  else if(knownTac2[0] == nuidPICC[0] &&  
      knownTac2[1] == nuidPICC[1] &&  
      knownTac2[2] == nuidPICC[2] &&  
      knownTac2[3] == nuidPICC[3]){  
    KNOW = true;  
    id = 2; // 3rd case  
  }  
  else {  
   KNOW = false;  
   id=99; // default case  
  }  
  bool success = false;  
   switch(id){  
   case 0:  
   lcd.clear();  
   lcd.print("Sumbal");  
   Serial.println(F("Sumbal"));  
   delay(1000);  
   success = keypad_loop("1111");  
   break;  
   case 1:  
   lcd.clear();  
   lcd.print("Hamza");  
   Serial.println(F("Hamza"));  
   delay(1000);  
   success = keypad_loop("2222");  
   break;  
   case 2:  
   lcd.clear();  
   lcd.print("FAHAD");  
   Serial.println(F("FAHAD"));  
   delay(1000);  
   success = keypad_loop("3333");  
   break;  
   default:  
   lcd.clear();  
   lcd.print("Not Found");  
   Serial.println("Not found");  
   delay(1000);  
  }  
  if(success){  
   lcd.clear();  
   lcd.print("Door Unlocked!");  
   Serial.println("Door Unlocked!");  
   digitalWrite(redpin, LOW);  
   digitalWrite(greenpin, HIGH);  
  }  
  else{  
   lcd.clear();  
   lcd.print("Try again!");  
   Serial.println("Try again!");  
  }  
  // Halt PICC  
  rfid.PICC_HaltA();  
  // Stop encryption on PCD  
  rfid.PCD_StopCrypto1();  
  // Print a message to the LCD and Serial.  
  delay(2000);  
  lcd.clear();  
  lcd.print("Waiting for Card");  
  Serial.println("Waiting for Card");  
  digitalWrite(greenpin, LOW);  
  digitalWrite(redpin, HIGH);  
 } // void loop() ends  
 ///////////////////////////////////////////////////////////////////////////////////////  
 bool keypad_loop(String PIN){ // PIN section  
  lcd.clear();  
  lcd.print("Enter PIN...");  
  Serial.println("Enter PIN...");  
  String input;  
  int i = 0;  
  bool control = true;  
  bool success = false;  
  while(control == true){  
  char keypressed = myKeypad.getKey();  
  if (keypressed != NO_KEY){  
   if(i<4){ // 4-digit input  
    if(i==0)lcd.clear();  
    i++;  
    input.concat( String(keypressed) );  
    lcd.print("*");  
   }  
   if(i==4){  
    control = false;  
    if(input.equals(PIN) ){  
     success = true;  
    }  
  }  
  } // NO_KEY if ends  
  } // while ends  
  return success;  
 }  

Please feel free to comment below if you find something inaccurate or awesome :-)