Check-In and Check-Out System Using Arduino Nano and LCD

The objective of this project is to create a simple attendance and check-in/check-out system using an Arduino Nano, a 16×2 LCD, two push buttons, and the Serial Monitor.

The system allows a user to enter their name through the Serial Monitor and then record their check-in and check-out time using two buttons.

Arduino Nano

16×2 LCD Display

2 × Push Buttons (inbuild in shield )

DESHBOT Shield

Jumper Wires

USB Cable

LCD

LCD PinArduino Nano

RS - A4

EN - A3

D4 - A2

D5 - A1

D6 - A0

D7 - D13

Buttons

ButtonArduino Nano

Check-In - D12

Check-Out - D10

Both buttons use the Arduino's internal pull-up resistors.

When the Arduino starts, the LCD displays:

The user enters their name through the Serial Monitor.

For example:

The Arduino saves the name and displays it on the LCD.

Check-In

When the D12 button is pressed:

1. The user's status becomes checked in.
2. The LCD displays CHECK IN.
3. The current time is displayed.
4. The name, date, and time are sent to the Serial Monitor.

Example:

Check-Out

When the D10 button is pressed:

1. The user's status becomes checked out.
2. The LCD displays CHECK OUT.
3. The current time is displayed.
4. The name, date, and time are sent to the Serial Monitor.

Example:

Clock System

The project uses the Arduino's millis() function to create a software clock.

The clock keeps track of:

1. Seconds
2. Minutes
3. Hours
4. Days
5. Months
6. Years

The starting date and time can be changed in the code.

For example:

Date System

The program automatically handles the number of days in each month.

It supports:

1. 28 days in February
2. 29 days in February during leap years
3. 30-day months
4. 31-day months
5. Changing from December to January
6. Increasing the year automatically

Day Calculation

The program calculates the day of the week using Zeller's Congruence.

The LCD displays the date together with the short day name.

Example:

Serial Monitor

The Serial Monitor is used to:

1. Enter the user's name.
2. Display the saved name.
3. Display check-in records.
4. Display check-out records.

The Serial Monitor should be set to:

The Arduino Check-In and Check-Out System demonstrates how an Arduino Nano can combine an LCD, push buttons, Serial Monitor, and software-based date/time calculations to create a simple attendance system.

The project also demonstrates practical use of functions, variables, if/else, switch, millis(), strings, button inputs, and date calculations in an embedded-system application.