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QR Code Attendance System

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Abstract

Build a QR Code Attendance System that generates QR codes for users and scans them to mark attendance. The app provides a GUI for generating and scanning codes. This project demonstrates QR code generation, image processing, and GUI development in Python.

Prerequisites

  • Python 3.6 or above
  • Text Editor or IDE
  • Basic understanding of Python syntax
  • Familiarity with Tkinter for GUI development
  • Knowledge of QR code generation and OpenCV

Getting Started

Creating a new project

  1. Create a new project folder and name it qr_code_attendance_systemqr_code_attendance_system.
  2. Create a new file inside the folder and name it qr_code_attendance_system.pyqr_code_attendance_system.py.
  3. Open the project folder in your favorite text editor or IDE.
  4. Copy the code below and paste it into the qr_code_attendance_system.pyqr_code_attendance_system.py file.

Write the code

⚙️ qr_code_attendance_system.py
qr_code_attendance_system.py
"""
QR Code Attendance System
 
A Python application that generates QR codes for users and scans them to mark attendance. Features include:
- Generating QR codes for user identification.
- Scanning QR codes to mark attendance.
"""
 
import qrcode
import cv2
from tkinter import Tk, Label, Entry, Button, messagebox
from datetime import datetime
 
 
class QRCodeAttendanceSystem:
    def __init__(self, root):
        self.root = root
        self.root.title("QR Code Attendance System")
 
        Label(root, text="Enter User ID:").grid(row=0, column=0, padx=10, pady=10)
        self.user_id_entry = Entry(root, width=30)
        self.user_id_entry.grid(row=0, column=1, padx=10, pady=10)
 
        Button(root, text="Generate QR Code", command=self.generate_qr_code).grid(row=1, column=0, columnspan=2, pady=10)
        Button(root, text="Scan QR Code", command=self.scan_qr_code).grid(row=2, column=0, columnspan=2, pady=10)
 
    def generate_qr_code(self):
        """Generate a QR code for the entered user ID."""
        user_id = self.user_id_entry.get()
        if not user_id:
            messagebox.showerror("Error", "Please enter a User ID.")
            return
 
        qr = qrcode.QRCode(version=1, box_size=10, border=5)
        qr.add_data(user_id)
        qr.make(fit=True)
 
        img = qr.make_image(fill="black", back_color="white")
        img_path = f"{user_id}_qr.png"
        img.save(img_path)
 
        messagebox.showinfo("Success", f"QR Code generated and saved as {img_path}.")
 
    def scan_qr_code(self):
        """Scan a QR code to mark attendance."""
        cap = cv2.VideoCapture(0)
        detector = cv2.QRCodeDetector()
 
        while True:
            ret, frame = cap.read()
            if not ret:
                break
 
            data, bbox, _ = detector.detectAndDecode(frame)
            if data:
                timestamp = datetime.now().strftime("%Y-%m-%d %H:%M:%S")
                messagebox.showinfo("Attendance Marked", f"User ID: {data}\nTime: {timestamp}")
                break
 
            cv2.imshow("QR Code Scanner", frame)
            if cv2.waitKey(1) & 0xFF == ord("q"):
                break
 
        cap.release()
        cv2.destroyAllWindows()
 
 
def main():
    root = Tk()
    app = QRCodeAttendanceSystem(root)
    root.mainloop()
 
 
if __name__ == "__main__":
    main()
qr_code_attendance_system.py
"""
QR Code Attendance System
 
A Python application that generates QR codes for users and scans them to mark attendance. Features include:
- Generating QR codes for user identification.
- Scanning QR codes to mark attendance.
"""
 
import qrcode
import cv2
from tkinter import Tk, Label, Entry, Button, messagebox
from datetime import datetime
 
 
class QRCodeAttendanceSystem:
    def __init__(self, root):
        self.root = root
        self.root.title("QR Code Attendance System")
 
        Label(root, text="Enter User ID:").grid(row=0, column=0, padx=10, pady=10)
        self.user_id_entry = Entry(root, width=30)
        self.user_id_entry.grid(row=0, column=1, padx=10, pady=10)
 
        Button(root, text="Generate QR Code", command=self.generate_qr_code).grid(row=1, column=0, columnspan=2, pady=10)
        Button(root, text="Scan QR Code", command=self.scan_qr_code).grid(row=2, column=0, columnspan=2, pady=10)
 
    def generate_qr_code(self):
        """Generate a QR code for the entered user ID."""
        user_id = self.user_id_entry.get()
        if not user_id:
            messagebox.showerror("Error", "Please enter a User ID.")
            return
 
        qr = qrcode.QRCode(version=1, box_size=10, border=5)
        qr.add_data(user_id)
        qr.make(fit=True)
 
        img = qr.make_image(fill="black", back_color="white")
        img_path = f"{user_id}_qr.png"
        img.save(img_path)
 
        messagebox.showinfo("Success", f"QR Code generated and saved as {img_path}.")
 
    def scan_qr_code(self):
        """Scan a QR code to mark attendance."""
        cap = cv2.VideoCapture(0)
        detector = cv2.QRCodeDetector()
 
        while True:
            ret, frame = cap.read()
            if not ret:
                break
 
            data, bbox, _ = detector.detectAndDecode(frame)
            if data:
                timestamp = datetime.now().strftime("%Y-%m-%d %H:%M:%S")
                messagebox.showinfo("Attendance Marked", f"User ID: {data}\nTime: {timestamp}")
                break
 
            cv2.imshow("QR Code Scanner", frame)
            if cv2.waitKey(1) & 0xFF == ord("q"):
                break
 
        cap.release()
        cv2.destroyAllWindows()
 
 
def main():
    root = Tk()
    app = QRCodeAttendanceSystem(root)
    root.mainloop()
 
 
if __name__ == "__main__":
    main()

Key Features

  • Generate QR codes for user identification
  • Scan QR codes to mark attendance
  • GUI interface for user interaction

Explanation

Generating QR Codes

The app uses the qrcodeqrcode library to generate QR codes:

qr_code_attendance_system.py
qr = qrcode.QRCode(version=1, box_size=10, border=5)
qr.add_data(user_id)
qr.make(fit=True)
img = qr.make_image(fill="black", back_color="white")
img.save(img_path)
qr_code_attendance_system.py
qr = qrcode.QRCode(version=1, box_size=10, border=5)
qr.add_data(user_id)
qr.make(fit=True)
img = qr.make_image(fill="black", back_color="white")
img.save(img_path)

Scanning QR Codes

OpenCV is used to scan QR codes and mark attendance:

qr_code_attendance_system.py
cap = cv2.VideoCapture(0)
detector = cv2.QRCodeDetector()
while True:
    ret, frame = cap.read()
    data, bbox, _ = detector.detectAndDecode(frame)
    if data:
        # Mark attendance
qr_code_attendance_system.py
cap = cv2.VideoCapture(0)
detector = cv2.QRCodeDetector()
while True:
    ret, frame = cap.read()
    data, bbox, _ = detector.detectAndDecode(frame)
    if data:
        # Mark attendance

Running the Application

  1. Save the file.
  2. Install required dependencies:
pip install qrcode opencv-python
pip install qrcode opencv-python
  1. Run the application:
python qr_code_attendance_system.py
python qr_code_attendance_system.py

Conclusion

This QR Code Attendance System project is a great way to learn about QR code generation and image processing in Python. You can extend it by adding a database, attendance history, or email notifications.

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