Summary of 4X4 Keypad based Password with ATmega32 and LCD Display
This project designs a password-protected system using an AVR ATmega32 microcontroller, a 4x4 keypad, and a 16x2 LCD. Users enter a four-digit numeric password; the system compares it against a preset code (1234). Upon success, pressing any keypad key displays its value on the LCD. The article outlines necessary software tools for programming and downloading the hex file to the microcontroller.
Parts used in the Keypad based Password System:
- AVR ATmega32 microcontroller
- 4X4 Keypad
- 16X2 Alphanumeric LCD
Security is a prime concern in our day-today life. Everyone wants to be as much secured as possible. Keypad based password is one of the many method and the most common and easy one to provide security to any system.
In this project, we will learn How to design a password protected system using a 4X4 keypad with AVR ATmega32 microcontroller. Here, the user will enter a 4 digit numeric password to gain access of the system and after gaining access of the system, the user presses different keys of the 4X4 keypad and the system displays the value of the pressed key in a 16X2 alphanumeric LCD. The user enters the 4 digit numeric password by pressing different keys of the 4X4 keypad one by one. For each key pressed, a * is displayed in the 16X2 alphanumeric LCD. After entering 4 digits of the password, the microcontroller compares the entered password with the set password (1234 in our case) and displays the result of the comparison in the 16X2 alphanumeric LCD as Correct Password or Wrong Password. Once the correct password is entered, the user can press different keys of the 4X4 keypad and the 16X2 alphanumeric LCD displays the value of the pressed keys. Try entering different combinations of passwords and see the output.
| Key Pressed | Key Value |
| 1 | 1 |
| 2 | 2 |
| 3 | 3 |
| 4 | 4 |
| 5 | 5 |
| 6 | 6 |
| 7 | 7 |
| 8 | 8 |
| 9 | 9 |
| 0 | 0 |
| * | * |
| # | # |
| A | A |
| B | B |
| C | C |
| D | D |
Softwares Required
For more detail: 4X4 Keypad based Password with ATmega32 and LCD Display
- How does the user gain access to the system?
The user enters a 4 digit numeric password by pressing keys one by one. - What happens when a key is pressed during password entry?
A * symbol is displayed on the 16X2 alphanumeric LCD for each key pressed. - Does the system compare the entered password with a set value?
Yes, the microcontroller compares the entered password with the set password after 4 digits are entered. - What result is displayed if the password is incorrect?
The LCD displays Wrong Password if the comparison fails. - What is displayed on the screen after the correct password is entered?
The LCD displays Correct Password and then shows the value of subsequent keys pressed. - Which microcontroller is used in this project?
An AVR ATmega32 microcontroller is used to design the system. - What software is required to download the hex file?
SinaProg Hex Downloader Software is required along with other tools. - Can users try different combinations of passwords?
Yes, users can try entering different combinations of passwords to see the output.
