The presence of students in an office or school is typically marked by attendance systems. The attendance management system has greatly improved over the years, from marking attendance manually in attendance registers to using high-tech applications and biometric systems. Other electronic attendance system projects that we covered in previous projects included RFID, AVR, and 8051 microcontrollers. We used an Arduino to take attendance records and use a fingerprint module to take attendance data. The system will become more secure for users if it uses a fingerprint sensor. A biometric attendance system based on fingerprints is described in the next section of the article.

Arduino -1 Finger print module -1 Push Button - 4 LEDs -1 1K Resistor -2 2.2K resistor -1 Power Connecting wires Box Buzzer -1

16x2 LCD -1 Bread Board -1 RTC Module -1

A fingerprint attendance system circuit includes a Fingerprint Sensor module that operates by recognizing a person's fingerprint. This allows the system to authenticate the person or employee. Four push buttons are being used here: Up/Down, Delete, Enroll. A key has three functions: ENROLL, DEL, and END. A new user is enrolled into the system by using the ENROLL key. The user must then press the ENROLL key when enrolling a new finger. LCD will then ask the user for an ID and where the fingerprint image is to be stored. In this case, the user may press ENROLL again to return to the first step if he or she does not want to go any further. The ENROLL key behaves as the Back key this time. Enrollment and backtracking are both possible with the ENROLL key. As well as downloading attendance data over the serial monitor, the enroll key is also used for enrollment. A similar double function is provided by DEL/OK, since the user must select finger ID using UP and DOWN after enrolling a new finger. After pressing the DEL/OK key (this time it acts like OK), the user can proceed to selecting the ID. Deleting data from the EEPROM of Arduino is accomplished by the Del key.

The fingerprint sensor module captures an image of the finger's print and uses that to create an equivalent template. It then saves the template as selected by Arduino into its memory. A fingerprint image is captured, the fingerprint is converted into templates, and the finger is stored as an ID using Arduino.

Our fingerprint module has a yellow LED that we have added to indicate that it is ready to take a fingerprint image. Additionally, buzzers are used to indicate various things. This system is controlled by an Arduino; it controls the entire thing.

In the above diagram, we can see that this fingerprint-based attendance system project involves a fairly simple circuit. An Arduino controller controls the entire process, push buttons for enrolment, deletion, selection of IDs, and attendance, LEDs for indication, and an LCD to display the message to users. It can be seen in the circuit diagram that the push button is directly connected to pin A0 (ENROL), With respect to ground, pins A1(DEL), A2(UP), and A3(DOWN) of an Arduino are connected to one k resistor, and pin D7 of the Arduino is connected to the yellow LED via a 1k resistor. Arduino's Serial pins D2 and D3 (Software Serial) are directly connected to the RX and TX of the fingerprint module.

Power is supplied by a 5v supply to an Arduino board with a fingerprint module. The pin A5 is also connected to a buzzer. In this example, a 16x2 LCD is configured in 4-bit mode, with D4, D5, D6 and D7 connected directly to digital pins D13, D12, D11, D10, D9, and D8 of the Arduino. Working of fingerprint-based attendance systems It is a relatively simple project, working with fingerprint attendance systems. With the help of push buttons, the user first needs to register his or her fingerprints. The user must press ENROLL to save the fingerprint in memory by ID name and then the LCD will ask for the user's ID name. As a consequence, an ID must now be entered by using the UP/DOWN keys. Press the OK button (DEL) once the user has selected the ID. In order to use the fingerprint module, LCD now asks the user to place their finger there. As a result, the user must now place his finger over the fingerprint module in order for it to generate an image. Once you take your finger off the fingerprint module, the LCD will ask you to repeat the process. As soon as the user places his finger again, the module takes an image and converts it into a template which is stored by selecting the ID into the fingerprint module's memory. By now, the user has been registered and can use the fingerprint module to feed attendance. The system will allow all of the users to enrol in the same way. The user now needs to press the DEL key if he/she wants to delete the stored fingerprint or ID. LCD will then prompt you for the ID to be deleted after pressing the delete key. After selecting an ID, the user must press the OK key (the same key as DEL). When the fingerprint is successfully deleted, the LCD will let you know.

After placing his finger over the fingerprint module, the user will see that the fingerprint device is captured and that it is searching if any recorded ID is associated with these fingerprints. Upon detecting a fingerprint ID, the LCD will display Attendance registered, while a buzzer will burst out once and the LED will turn off until a new input can be entered. We have also implemented a Time and Date module with the fingerprint module. The system keeps track of the time and date continuously. In this context, Arduino automatically grabs time and date from a user's finger when they place it over the fingerprint and saves them in the allocated memory slot. This system allows us to create five user spaces for 30 days. When the RESET key in Arduino is pressed and once the program is enrolled, the key will download information from the Arduino EEPROM over the serial monitor.

Our Arduino UNO comes equipped with 1023 byte of memory of which 1018 byte are available for data storage, and we have taken five days' attendance data from the Arduino UNO. In addition to recording time and date, every attendance recording will be 7-bytes in size. As a result, total memory requirements are 5*30*7=1050 so here we need more 32 bytes However, if four users are used, then we need 4*30*7=840 . Here, we have taken the memories of five users to demonstrate this project. The 5th user's attendance records will be unable to be stored since we will not be able to store 32 bytes of data each time. Change some lines in the code to make it work with four users. Fingerprint sensors are commonly used in mobile, lock

and unlock, on a mobile display, on a phone screen, in security systems, attendance systems, and security locks.