SmartAttend-IoT-Based-RFID-Attendance-System

ESP32 RFID Attendance and Registration System

This project is a complete offline + online RFID-based attendance and registration system built using an ESP32, MFRC522 RFID reader, DS3231 RTC, ILI9341 TFT display, and Google Sheets integration via a Google Apps Script Web App. HTML Email Reports with user name, UID, time/date, and mode

It features real-time attendance marking, offline data storage with auto-sync, registration, time tracking, email notifications, and a user-friendly TFT interface.

---

📌 Features

• 🔐 RFID Authentication with MFRC522
• 🌐 Wi-Fi Connectivity with auto-reconnect and signal strength display
• 📅 Real-Time Clock (DS3231) with NTP sync when online
• 📊 Google Sheets Integration for logging attendance & registration
• 📤 Offline Data Logging to EEPROM with auto-upload when online
• 📧 Email Notifications using ESP_Mail_Client (SMTP via Gmail)
• 🖥️ TFT Display (ILI9341) with mode, time, date, UID info, status icons
• 🧠 EEPROM Storage (512 bytes) for offline mode
• 🔔 Buzzer Feedback and LED WiFi status indicators
• 🔘 Mode Toggle Button between Registration and Attendance
• 🧾 HTML Email Reports with user name, UID, time/date, and mode
• 💡 WiFi Icon UI shows signal bars or red cross when disconnected

---

🔧 Hardware Requirements

Component	Model / Specs
Microcontroller	ESP32 (DevKit / NodeMCU)
RFID Reader	MFRC522
RTC Module	DS3231
Display	ILI9341 2.4"/2.8" SPI
EEPROM	Built-in (512 bytes used)
Buzzer	Passive Buzzer (Pin 27)
LED	Indicator (Pin 26)
Button	Toggle mode (Pin 25)

stateDiagram-v2 [*] --> Idle

Idle --> ModeSwitch : Button Press
ModeSwitch --> Idle : Mode toggled (reg <-> atc)

Idle --> ScanCard : Card detected

ScanCard --> CheckWiFi : Check WiFi connection

CheckWiFi --> Online : WiFi connected
CheckWiFi --> Offline : WiFi disconnected

Online --> Registration : Mode == reg
Online --> Attendance : Mode == atc

Registration --> SendRegisterRequest : Send UID & Mode to Server
SendRegisterRequest --> RegisterSuccess : UID not registered
SendRegisterRequest --> RegisterFail : UID already registered
RegisterSuccess --> SendEmailNotification
RegisterFail --> Idle
SendEmailNotification --> Idle

Attendance --> CheckUID : Check UID in user database
CheckUID --> UIDFound
CheckUID --> UIDNotFound

UIDFound --> CheckTodayAttendance

CheckTodayAttendance --> MarkTimeIn : No attendance today
CheckTodayAttendance --> MarkTimeOut : Time In exists but no Time Out
CheckTodayAttendance --> AttendanceComplete : Time In and Time Out already marked

MarkTimeIn --> SendAttendanceRequest
MarkTimeOut --> SendAttendanceRequest

SendAttendanceRequest --> AttendanceSuccess
SendAttendanceRequest --> AttendanceFail

AttendanceSuccess --> SendEmailNotification
AttendanceFail --> LogOfflineData

SendEmailNotification --> Idle

UIDNotFound --> ShowErrorMessage : UID not registered
ShowErrorMessage --> Idle

Offline --> LogOfflineData : Save scan data to EEPROM
LogOfflineData --> Idle

Idle --> SyncOfflineData : WiFi reconnect detected
SyncOfflineData --> SendOfflineDataRequests
SendOfflineDataRequests --> SyncComplete
SyncComplete --> Idle