Assistive technology and accessibility • Small RFID 125KHZ (RDM6300) Attendance and Access Control

Code:

import sqlite3from openpyxl import Workbook, load_workbookfrom datetime import datetimeimport timeimport RPi.GPIO as GPIOimport socketimport rdm6300# Get the hostname dynamicallyHOSTNAME = socket.gethostname()print("Hostname:", HOSTNAME)# Setup GPIOGPIO.setmode(GPIO.BOARD)GPIO.setwarnings(False)Lock = 37Button = 36  # Use physical pin number 11 for GPIO 16GPIO.setup(Lock, GPIO.OUT)GPIO.setup(Button, GPIO.IN, pull_up_down=GPIO.PUD_DOWN)  # Set up pin 11 as input with pull-down resistorGPIO.output(Lock, GPIO.HIGH)# SQLite database setupdef init_db():    conn = sqlite3.connect('attendance.db')    c = conn.cursor()    c.execute('''CREATE TABLE IF NOT EXISTS Employees (                     ID INTEGER PRIMARY KEY,                     name TEXT,                     team_name TEXT,                     card_id INTEGER UNIQUE,                     status TEXT CHECK(status IN ('active', 'disabled')) DEFAULT 'active')''')    c.execute('''CREATE TABLE IF NOT EXISTS Location (                     LocationID INTEGER PRIMARY KEY,                     LocationName TEXT)''')    c.execute('''CREATE TABLE IF NOT EXISTS Site (                     SiteID INTEGER PRIMARY KEY,                     SiteName TEXT,                     LocationID INTEGER,                     FOREIGN KEY (LocationID) REFERENCES Location(LocationID))''')    c.execute('''CREATE TABLE IF NOT EXISTS Door (                     DoorID INTEGER PRIMARY KEY,                     DoorName TEXT,                     SiteID INTEGER,                     FOREIGN KEY (SiteID) REFERENCES Site(SiteID))''')    c.execute('''CREATE TABLE IF NOT EXISTS EmployeeLocation (                     EmployeeID INTEGER,                     LocationID INTEGER,                     StartTime TEXT,                     EndTime TEXT,                     PRIMARY KEY (EmployeeID, LocationID),                     FOREIGN KEY (EmployeeID) REFERENCES Employees(ID),                     FOREIGN KEY (LocationID) REFERENCES Location(LocationID))''')    c.execute('''CREATE TABLE IF NOT EXISTS EmployeeSite (                     EmployeeID INTEGER,                     SiteID INTEGER,                     StartTime TEXT,                     EndTime TEXT,                     PRIMARY KEY (EmployeeID, SiteID),                     FOREIGN KEY (EmployeeID) REFERENCES Employees(ID),                     FOREIGN KEY (SiteID) REFERENCES Site(SiteID))''')    c.execute('''CREATE TABLE IF NOT EXISTS EmployeeDoor (                     EmployeeID INTEGER,                     DoorID INTEGER,                     StartTime TEXT,                     EndTime TEXT,                     PRIMARY KEY (EmployeeID, DoorID),                     FOREIGN KEY (EmployeeID) REFERENCES Employees(ID),                     FOREIGN KEY (DoorID) REFERENCES Door(DoorID))''')    conn.commit()    return connconn = init_db()def is_access_allowed(employee):    return employee[3] == 'active'def setup_excel():    excel_file_name = 'attendance_excel.xlsx'    try:        wb = load_workbook(excel_file_name)    except FileNotFoundError:        wb = Workbook()    sheet_name = str(datetime.now().date())    if sheet_name not in wb.sheetnames:        sheet = wb.create_sheet(title=sheet_name)        sheet.append(['Full Name', 'Personnel ID', 'Date and Time', 'Location'])    else:        sheet = wb[sheet_name]    wb.save(excel_file_name)    return wb, sheetdef get_employee_by_card_id(card_id):    c = conn.cursor()    c.execute('''SELECT ID, name, card_id, status                 FROM Employees                 WHERE card_id = ?''', (card_id,))    return c.fetchone()def is_employee_allowed_at_door(employee_id, door_name, current_time):    c = conn.cursor()    c.execute('''SELECT ed.StartTime, ed.EndTime                 FROM EmployeeDoor ed                 JOIN Door d ON ed.DoorID = d.DoorID                 WHERE ed.EmployeeID = ? AND d.DoorName = ?''', (employee_id, door_name))    row = c.fetchone()    if row:        start_time, end_time = row        start_time = datetime.strptime(start_time, '%H:%M').time()        end_time = datetime.strptime(end_time, '%H:%M').time()        return start_time <= current_time <= end_time    return Nonedef button_callback(channel):    print("Button pressed, deactivating relay for 5 seconds.")    GPIO.output(Lock, GPIO.LOW)    time.sleep(5)    GPIO.output(Lock, GPIO.HIGH)    print("Relay reactivated.")def record_attendance(wb, sheet):    GPIO.output(Lock, True)    excel_file_name = 'attendance_excel.xlsx'    rfid_reader = rdm6300.Reader('/dev/ttyS0')    last_access_time = None  # To track the last access time    last_card_id = None  # To track the last scanned card ID    lockout_period = False  # To track if the system is in lockout period    while True:        try:            if not lockout_period:                print('Scan Your Card')                card = rfid_reader.read()  # Blocking call to read the card                if card:                    card_id = card.value                    now = datetime.now().strftime("%d-%m-%Y %I:%M:%S %p")                    current_time = datetime.now().time()                    print('Card ID: {}'.format(card_id))                    print('Time of Scan: {}'.format(now))                                        # Check if the current card is the same as the last card                    if card_id != last_card_id or (datetime.now() - last_access_time).total_seconds() >= 5:                        last_card_id = card_id                        last_access_time = datetime.now()                                                employee = get_employee_by_card_id(card_id)                        if employee:                            print('Employee details:', employee)                            if is_access_allowed(employee):                                allowed_time_range = is_employee_allowed_at_door(employee[0], HOSTNAME, current_time)                                if allowed_time_range is not None:                                    if allowed_time_range:                                        print("Access allowed. Opening Door")                                        GPIO.output(Lock, GPIO.LOW)  # Deactivate the lock                                        lockout_period = True  # Enter lockout period                                        sheet.append([employee[1], employee[2], now, HOSTNAME])                                        wb.save(excel_file_name)                                        # Wait until the door is closed and then reset lockout_period                                        while (datetime.now() - last_access_time).total_seconds() < 5:                                            time.sleep(0.1)  # Periodically check if 5 seconds have passed                                        GPIO.output(Lock, GPIO.HIGH)  # Reactivate the lock                                        lockout_period = False  # Reset lockout period                                    else:                                        print("Access not allowed at this time")                                else:                                    print("Access not allowed at this door")                            else:                                print("Employee is disabled. Attendance not recorded.")                        else:                            print('Employee not found')                            time.sleep(1)            else:                time.sleep(0.1)  # During lockout period, check periodically        except Exception as e:            print("Error during attendance recording: {}".format(e))        except KeyboardInterrupt:            print("Script terminated by user.")            break        finally:            GPIO.output(Lock, GPIO.HIGH)            time.sleep(0.1)if __name__ == "__main__":    try:        wb = load_workbook('attendance_excel.xlsx')    except FileNotFoundError:        wb = Workbook()    sheet_name = str(datetime.now().date())    if sheet_name not in wb.sheetnames:        sheet = wb.create_sheet(title=sheet_name)        sheet.append(['Full Name', 'Personnel ID', 'Date and Time', 'Location'])    else:        sheet = wb[sheet_name]    try:        # Add event detection for the button press        GPIO.add_event_detect(Button, GPIO.RISING, callback=button_callback, bouncetime=200)                record_attendance(wb, sheet)    except KeyboardInterrupt:        print("Script terminated by user.")    finally:        conn.close()        GPIO.cleanup()