Basic Level     Skills: Not specified    
Author
Author email
[email protected]
Author website
www.8051projects.net

Description

Project tested and working perfectly

Digital Lock Using AT89C2051 with LCD and Keypad - Assembly

A Brief Description:
This project is a rewrite of previously made project "Digital Code Lock using keypad and LCD"
I got many requests from student's side who want this project in Assembly language. So i spent some time making this project.

You will find working of this project same as that of original project. Nothing has been changed as such.

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 4x3 Keypad (please see the schematic for more information) and Display the user input on a 2x16 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 digit code. 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 (4x3) 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.asm - Project Code
LCD.hex - Final Hex file
Digital Code Lock Schematic - PDF file of orcad schematic

If any problem Please post in the forum
  Filesize

17.46 kB

  Downloads

56125

  Rating
 

Comments

nasima
30 Oct 2014: 11:54 AM
i want you to help me in a program for interfatcing hex key pad with8051 and then make a digital lock
Kindly guide me as to how to combine the two different programs. thanks
  
ajay_bhargav
02 Nov 2014: 07:10 AM
Just down the project and go through the code yourself. If you need help, just post a question. You can also look into our tutorial section for keypad tutorial.
  
navig
24 Apr 2015: 18:24 PM
sir in the above shown program where are you going to dtore new password.
as you have not shown any memory ic
  
ajay_bhargav
29 Apr 2015: 18:55 PM
@navig, This project does not store password in non-volatile memory. It just stores the password in RAM and if controller resets password also resets. You can add an EEPROM to add saving password to EEPROM.
  
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Conversation

Wed Jul 01 2015, 05:14 PM
ShubhamBansal1996
i am making a project of connecting 4 8051's using a can bus for which i am using mcp2515 and mcp2551.but before making it i want to ensure it works by simulating it on proteus though the two ic's mentioned above dont seem to have models in proteus so is there anyone who can help me with that
ExperimenterUK
Tue Jun 30 2015, 05:24 PM
@sachinmm The 8051 timer can't do 1 second. It can do 50ms so count 20 times
sachinmm
Sat Jun 27 2015, 05:01 AM
how calculate 1 second delay in 8051 by using timer and what value should be store in TH0 & TLO register??
sachinmm
Fri Jun 26 2015, 08:25 AM
hello sir plz tell me how to know the 74HC165 parallel in serial out ic is fauty or not?
Wed Jun 24 2015, 08:24 AM
ben mutuku
How can one use XOR gate to ensure the first output is '1' and the next is '0'?
ExperimenterUK
Wed Jun 17 2015, 01:37 AM
@baz..try adding a hash and a semi colon
Sun Jun 14 2015, 06:31 AM
baz
@ExperimenterUK no..i dont do that i just type message example.. Hello my name is baz and then i click send message,
ExperimenterUK
Sun Jun 14 2015, 01:55 AM
@baz..did you end your message with a hash and a semi colon
Sat Jun 13 2015, 06:48 PM
asif Jamadar
I want the program for v/f control technique of 3 phase induction motor
Sat Jun 13 2015, 07:06 AM
baz
@ExperimenterUK okay thank you...but now I already complete and my dot matrix already light up but when i send message from pc to my hardware project it doesnt show any message on my dot matrix..its only blinking when i click send message....I really dont know whats the problem...I had follow all the steps...schematic and use the coding that have been provided..is it because firstly i had wrong burn the coding in AT24C16?? Is that effect ????

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Comments

Nals99
Fri Jul 03 2015, 08:33 AM
Mc_Comet32
Thu Jun 25 2015, 11:42 AM
yashaswi
Thu Jun 25 2015, 05:56 AM
Riki-cc
Tue Jun 23 2015, 10:48 AM
PadRlp
Thu Jun 18 2015, 02:11 PM
start
Thu Jun 18 2015, 01:30 PM
sheilabajos
Tue Jun 09 2015, 03:35 PM
martintan
Tue Jun 09 2015, 12:08 AM

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Forum Activity
ajay_bhargav Avatar
Posted By ajay_bhargav
Sat Jul 04 2015, 06:24 AM
As Phil said this looks more of a hardware problem...
ajay_bhargav Avatar
Posted By ajay_bhargav
Sat Jul 04 2015, 06:16 AM
XC8 is available for free so you can still use it ...
ajay_bhargav Avatar
Posted By ajay_bhargav
Sat Jul 04 2015, 06:14 AM
You need to vary the digital value in DACR registe...
Nals99 Avatar
Posted By Nals99
Fri Jul 03 2015, 09:34 AM
Here you have an example using timer 0: void delay...
Nals99 Avatar
Posted By Nals99
Fri Jul 03 2015, 08:52 AM
Hi guys...I'm having some problems to transmit dat...
Karan123 Avatar
Posted By Karan123
Thu Jul 02 2015, 09:12 AM
@ajay_bhargav i will not prefer costly ic because ...
prajwalsnh Avatar
Posted By prajwalsnh
Wed Jul 01 2015, 05:21 AM
@ExperimenterUKThanks a lot for correcting my misc...
prajwalsnh Avatar
Posted By prajwalsnh
Wed Jul 01 2015, 05:17 AM
@ExperimenterUK Thank you for your simple and usef...
ExperimenterUK Avatar
Posted By ExperimenterUK
Tue Jun 30 2015, 05:45 PM
The 8051 timer can't do 1 second. It can do 50ms, ...
ExperimenterUK Avatar
Posted By ExperimenterUK
Tue Jun 30 2015, 05:38 PM
Debugging is the process of finding out why your ...