Sample Codes

4X4 Keypad based Password with ATmega32 and LCD Display

Mark as Favourite

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

• AVR Studio 4 Software
• WinAVR 2010 Software
• SinaProg Hex Downloader Software
• USBasp Driver

Hardwares Required

Name	Quantity
AVR Trainer Board-100 with ATmega32	1pc
AVR USB Programmer	1pc
12V, 1A DC SMPS Adaptor	1pc
RG1602A 16X2 Alphanumeric LCD Green	1pc
4X4 Keypad	1pc
1 to 1 Connector-Female to Female	3pc
10 to 10 FRC Female to Female Connector	3pc

Video

Connection Guide

The step-by-step connection guide for 4X4 Keypad based Password with ATmega32 and LCD Display is as follows