Aqib
Published

RFID and Keypad Based Door Lock Using Arduino

To open the door, the user will have to first scan the right tag and then he will have to enter the correct password.

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Things used in this project

Hardware components

Arduino UNO & Genuino UNO
Arduino UNO & Genuino UNO
×1
I2C LCD
×1
MFRC522 RFID reader
×1
SG90 Micro-servo motor
SG90 Micro-servo motor
×1
4X4 keypad
×1
LED
×3
Resistor 220 ohm
Resistor 220 ohm
×3
Buzzer
Buzzer
×1
6 to 12V Power source
×1

Story

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Schematics

RFID and Keypad Based Door Lock using Arduino

RFID and Keypad Based Door Lock using Arduino

Code

Code snippet

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

// Create instances
LiquidCrystal_I2C lcd(0x27, 16, 2);
MFRC522 mfrc522(10, 9); // MFRC522 mfrc522(SS_PIN, RST_PIN)
Servo sg90;

// Initialize Pins for led's, servo and buzzer
// Blue LED is connected to 5V
constexpr uint8_t greenLed = 7;
constexpr uint8_t redLed = 6;
constexpr uint8_t servoPin = 8;
constexpr uint8_t buzzerPin = 5;

char initial_password[4] = {'1', '2', '3', '4'};  // Variable to store initial password
String tagUID = "29 B9 ED 23";  // 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

// 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() {
  // Arduino Pin configuration
  pinMode(buzzerPin, OUTPUT);
  pinMode(redLed, OUTPUT);
  pinMode(greenLed, OUTPUT);

  sg90.attach(servoPin);  //Declare pin 8 for servo
  sg90.write(0); // Set initial position at 90 degrees

  lcd.begin();   // LCD screen
  lcd.backlight();
  SPI.begin();      // Init SPI bus
  mfrc522.PCD_Init();   // Init MFRC522

  lcd.clear(); // Clear LCD screen
}

void loop() {
  // System will first look for mode
  if (RFIDMode == true) {
    lcd.setCursor(0, 0);
    lcd.print("   Door Lock");
    lcd.setCursor(0, 1);
    lcd.print(" Scan Your Tag ");

    // 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();
      lcd.print("Tag Matched");
      digitalWrite(greenLed, HIGH);
      delay(3000);
      digitalWrite(greenLed, LOW);

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

    else
    {
      // If UID of tag is not matched.
      lcd.clear();
      lcd.setCursor(0, 0);
      lcd.print("Wrong Tag Shown");
      lcd.setCursor(0, 1);
      lcd.print("Access Denied");
      digitalWrite(buzzerPin, HIGH);
      digitalWrite(redLed, HIGH);
      delay(3000);
      digitalWrite(buzzerPin, LOW);
      digitalWrite(redLed, LOW);
      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("Pass Accepted");
        sg90.write(90); // Door Opened
        digitalWrite(greenLed, HIGH);
        delay(3000);
        digitalWrite(greenLed, LOW);
        sg90.write(0); // Door Closed
        lcd.clear();
        i = 0;
        RFIDMode = true; // Make RFID mode true
      }
      else    // If password is not matched
      {
        lcd.clear();
        lcd.print("Wrong Password");
        digitalWrite(buzzerPin, HIGH);
        digitalWrite(redLed, HIGH);
        delay(3000);
        digitalWrite(buzzerPin, LOW);
        digitalWrite(redLed, LOW);
        lcd.clear();
        i = 0;
        RFIDMode = true;  // Make RFID mode true
      }
    }
  }
}

Credits

Aqib

Aqib

16 projects • 92 followers
For custom projects, Contact me at aqib@electronicshobbyists.com or Skype:muhammadaqib794

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