Project Documentation

Arduino UNO-Based Secure Entry System with RFID, Keypad, and LCD Display

Secure Entry Management System Documentation

Summary

This document provides a detailed overview of a Secure Entry Management System designed using an Arduino UNO microcontroller. The system integrates an RFID-RC522 module, a 4x4 membrane matrix keypad, an I2C LCD 16x2 screen, a servo motor, and a buzzer. The system provides real-time feedback and controls a locking mechanism based on user input and RFID authentication.

Component List

Arduino UNO
- Description: Microcontroller board based on the ATmega328P.
- Pins: UNUSED, IOREF, Reset, 3.3V, 5V, GND, Vin, A0, A1, A2, A3, A4, A5, SCL, SDA, AREF, D13, D12, D11, D10, D9, D8, D7, D6, D5, D4, D3, D2, D1, D0
I2C LCD 16x2 Screen
- Description: 16x2 character LCD display with I2C interface.
- Pins: SCL, SDA, VCC (5V), GND, VDD, VO, RS, RW, E, D0, D1, D2, D3, D4, D5, D6, D7, BLA, BLK
RFID-RC522
- Description: RFID module for reading and writing RFID tags.
- Pins: VCC (3.3V), RST, GND, IRQ, MISO, MOSI, SCK, SDA
4X4 Membrane Matrix Keypad
- Description: 4x4 matrix keypad for user input.
- Pins: R1, R2, R3, R4, C1, C2, C3, C4
Servo
- Description: Servo motor for controlling the locking mechanism.
- Pins: GND, VCC, PWM
Buzzer
- Description: Buzzer for audio feedback.
- Pins: PIN, GND

Wiring Details

Arduino UNO

5V to I2C LCD 16x2 Screen VCC (5V)
5V to Servo VCC
3.3V to RFID-RC522 VCC (3.3V)
GND to I2C LCD 16x2 Screen GND
GND to Servo GND
GND to RFID-RC522 GND
GND to Buzzer GND
A0 to 4X4 Membrane Matrix Keypad C1
A1 to 4X4 Membrane Matrix Keypad C2
A2 to 4X4 Membrane Matrix Keypad C3
A3 to 4X4 Membrane Matrix Keypad C4
A4 to I2C LCD 16x2 Screen SDA
A5 to I2C LCD 16x2 Screen SCL
D2 to 4X4 Membrane Matrix Keypad R1
D3 to 4X4 Membrane Matrix Keypad R2
D4 to 4X4 Membrane Matrix Keypad R3
D5 to 4X4 Membrane Matrix Keypad R4
D6 to Servo PWM
D7 to Buzzer PIN
D9 to RFID-RC522 RST
D10 to RFID-RC522 SDA
D11 to RFID-RC522 MOSI
D12 to RFID-RC522 MISO
D13 to RFID-RC522 SCK

I2C LCD 16x2 Screen

VCC (5V) to Arduino UNO 5V
GND to Arduino UNO GND
SDA to Arduino UNO A4
SCL to Arduino UNO A5

RFID-RC522

VCC (3.3V) to Arduino UNO 3.3V
GND to Arduino UNO GND
RST to Arduino UNO D9
SDA to Arduino UNO D10
MOSI to Arduino UNO D11
MISO to Arduino UNO D12
SCK to Arduino UNO D13

4X4 Membrane Matrix Keypad

C1 to Arduino UNO A0
C2 to Arduino UNO A1
C3 to Arduino UNO A2
C4 to Arduino UNO A3
R1 to Arduino UNO D2
R2 to Arduino UNO D3
R3 to Arduino UNO D4
R4 to Arduino UNO D5

Servo

VCC to Arduino UNO 5V
GND to Arduino UNO GND
PWM to Arduino UNO D6

Buzzer

PIN to Arduino UNO D7
GND to Arduino UNO GND

Code Documentation

/*
 * Secure Entry Management System
 * This Arduino sketch controls an access system using an RFID-RC522 module,
 * a 4x4 membrane matrix keypad, an I2C LCD 16x2 screen, a servo motor, and
 * a buzzer. The system provides real-time feedback and controls a locking
 * mechanism based on user input and RFID authentication.
 */

#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#include <Servo.h>
#include <MFRC522.h>
#include <Keypad.h>

// Pin definitions
#define RST_PIN 9
#define SS_PIN 10
#define BUZZER_PIN 7
#define SERVO_PIN 6

// Create instances
LiquidCrystal_I2C lcd(0x27, 16, 2);
Servo myServo;
MFRC522 rfid(SS_PIN, RST_PIN);

// Keypad setup
const byte ROWS = 4;
const byte COLS = 4;
char keys[ROWS][COLS] = {
  {'1','2','3','A'},
  {'4','5','6','B'},
  {'7','8','9','C'},
  {'*','0','#','D'}
};
byte rowPins[ROWS] = {2, 3, 4, 5};
byte colPins[COLS] = {A0, A1, A2, A3};
Keypad keypad = Keypad(makeKeymap(keys), rowPins, colPins, ROWS, COLS);

void setup() {
  // Initialize serial communication
  Serial.begin(9600);
  // Initialize LCD
  lcd.begin();
  lcd.backlight();
  // Initialize Servo
  myServo.attach(SERVO_PIN);
  myServo.write(0); // Lock position
  // Initialize RFID
  SPI.begin();
  rfid.PCD_Init();
  // Initialize Buzzer
  pinMode(BUZZER_PIN, OUTPUT);
  // Welcome message
  lcd.setCursor(0, 0);
  lcd.print("Welcome!");
  lcd.setCursor(0, 1);
  lcd.print("Scan your card");
}

void loop() {
  // Check for RFID card
  if (rfid.PICC_IsNewCardPresent() && rfid.PICC_ReadCardSerial()) {
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("Card detected");
    // Add your RFID authentication logic here
    // For now, we assume the card is valid
    lcd.setCursor(0, 1);
    lcd.print("Access Granted");
    myServo.write(90); // Unlock position
    digitalWrite(BUZZER_PIN, HIGH);
    delay(1000);
    digitalWrite(BUZZER_PIN, LOW);
    delay(5000); // Keep unlocked for 5 seconds
    myServo.write(0); // Lock position
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("Welcome!");
    lcd.setCursor(0, 1);
    lcd.print("Scan your card");
  }
  // Check for keypad input
  char key = keypad.getKey();
  if (key) {
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("Key pressed:");
    lcd.setCursor(0, 1);
    lcd.print(key);
    // Add your keypad handling logic here
    delay(1000);
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("Welcome!");
    lcd.setCursor(0, 1);
    lcd.print("Scan your card");
  }
}

This code initializes the components and provides the main logic for the Secure Entry Management System. The system checks for RFID card presence and keypad input, providing appropriate feedback and controlling the servo motor and buzzer accordingly.