8/4/2019 Digital Lock Code

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In this Project, Digital Code Lock using AT89C2051 LCD is used for display and a keyboard is

used to input the keys. The project source code is written in C. Both the C files and hex files are

given for download.

A Brief Description:

This project is written in C language. Its a simple project with efficient hacking prevention from

Brute Force etc. The basic user lock is of 5 Digits and Master Lock is of 10 digits so its not easy

for an intruder to break the lock unless you keep the code simple.

The input is taken from a 43 Keypad (please see the schematic for more information) andDisplay the user input on a 216 LCD. A pin is assigned as output for activating and

deactivating the lock. For demonstration i have connected an LED to that pin.

User Side Working:

The user has two options either he/she can use its own 5 digit code or use the default 5 digitcode. If user has to do setup his own code, then he has to enter 12345 and press #. After this..controller will ask for 10 Digit master password which is preprogrammed in the controller.

Entering master lock, user can enter the new 5 digit code for the lock and press # to save it.

Using the Keypad:

Keypad has 12 keys (43) starting from 1,2,3,4,5,6,7,8,9,*,0,# (please see the schematic for

layout). Numeric keys are used for entering numbers. * is used as the Cancel key and # is

used as the Enter key.

Download File Information:

LCD.C4-Bit LCD Drivers

LCD.HLCD function prototypes and other declerations

Lock.Ccode for lock functioning

LOCK.Hlock function declerations

KEYPAD.CKeypad drivers

KEYPAD.HFunction declerations

DELAY.CDelay Functions

DELAY.HFunction Prototypes only

MAIN.CMain function!