Digital Code Lock using 8051

July 25, 2009 by admin
Filed under: Microcontrollers 

Digital Code Lock Using AT89S52, 20×4 LCD with complete ‘C’ code

digital code lock deveshsamaiya

We all know about the electronic code locking security system, here is the same concept of electronic code lock using AT89S52 i.e. 8051 family of micro controller. it has a 4×3 keypad for user input of password which will be numeric and a 20×4 alphanumeric LCD is used for user interface.

There are two kind of passwords one is the user password and the other is master password. when any user try to open the lock he must enter the right password which is of 5 digits. the user will be given 3 chances to enter the correct code otherwise he will be asked for the master password which is 10 digits long.

dishaproject

LCD Commands for 20×4 Alphanumeric LCD are as follows:

Goto first line 0×80

Goto second line 0xC0

Goto Third line 0×94

Goto Fourth Line 0xD4

Code for this project includes Keypad interfacing and logic for password check, as well as LCD routines. Download the complete source code as well as schematic for the project.

Download Complete Source code for Digital Code lock here


Tags:

Comments

24 Comments on Digital Code Lock using 8051

  1. paresh on Fri, 9th Oct 2009 7:12 am

    2. dear sir
    i want to both two password for this project… so plz give the right password than i oprate this projects..

  2. naveen on Tue, 13th Oct 2009 1:18 pm

    3. dear all,
    I need assembly language code for the same.. can some one provide it??

  3. admin on Tue, 13th Oct 2009 1:45 pm

    4. @naveen..
    sorry its nt possible to me to write that much lengthy program in asm

  4. Aravinth on Tue, 3rd Nov 2009 2:11 pm

    5. can u please mail me the logic of the program, i mean the method u wrote the code. and have u written only using C or EMBEDDED C style of logic, coz its a bit different from the normal one which is used for 8051. anyways, a nice and simple project, i liked it…. do mail the flow of the program. thank u

  5. admin on Wed, 4th Nov 2009 8:21 am

    6. I dont know what is Embedded ‘C’ style of logic anyways !!! What matters is either your code efficient and working or not. Anyways i will mail you the flow of program…give me some time

  6. shiny on Wed, 18th Nov 2009 6:58 am

    7. i really thank u for posting and helping like us (learners – Embedded C)

  7. zeki on Fri, 20th Nov 2009 1:07 pm

    8. nice , i liked it………………please mail me the flow of the program. thank u

  8. SAJID on Tue, 29th Dec 2009 5:04 am

    9. Sir,

    please send me assembly code fo this circuit
    thanks

  9. naushin on Fri, 15th Jan 2010 10:38 am

    10. sir,
    can u plz mail me the complete details of digital code lock including the schematic and source code. Also i hv foll doubts:
    1.i want to add a buzzer which will raise an alarm if the intruder fails his 3 attempts.
    2. also i want 2 add time limit for the buzzer i.e how long it will continue 2 raise an alarm
    3.does the ckt runs on battery?if yes, then i want 2 add a kind of alarm that wil indicate the the battery has gone low so as to replace it
    how can i achieve the above conditions?? if der r any changes in prog wid regards to the above conditions.plz mail me the modified version of source code.
    waiting for ur reply..

  10. Jayasree on Tue, 26th Jan 2010 8:36 am

    11. Can i get some interview question & answers on 8051 microcontrollers.Any wesite or any book will be helpfull.
    Thanks

  11. divakar on Fri, 29th Jan 2010 1:30 am

    12. dear sir,
    this is really a good project. i have a doubt in the operation, i think the correct unlock code is 93016 and the master key is 9977411065. i am using the proteus demo to see the output for the code which you designed. my doubt is after entering the password what should be my next step to verify my password. please help me sir.

  12. admin on Sat, 30th Jan 2010 9:52 am

    13. if you have entered wrong password the system will tell you to re enter the password. One thing is that you cant use backspace. means you cant clear the key entered.

  13. chinmay on Tue, 23rd Mar 2010 12:36 pm

    14. please, can I get the assembly language program for the same?

  14. nitin on Tue, 23rd Mar 2010 12:44 pm

    15. hi, can you give me the code using the microcontroller

  15. admin on Fri, 26th Mar 2010 3:26 am

    16. try ajay bhargava 8051 projects website for asm code

  16. gayatri on Sat, 27th Mar 2010 10:55 am

    17. i liked the project…but cud u plz mail me the flowchart of the program?

  17. sayali on Tue, 30th Mar 2010 8:20 am

    18. plz send assembly language program for it

  18. admin on Wed, 31st Mar 2010 10:31 am

    19. why dont you understand the C code and convert on your own.???

  19. mehmet on Wed, 5th May 2010 8:37 pm

    20. hello! i want to use your project on a car contractor key before car ignites for security.
    but i wish to know, can i apply this circuit to the cars electricity system. or do recommend me another bur similar project?
    regards
    ps:if possible, please mail me your reply.

  20. admin on Thu, 6th May 2010 3:33 am

    21. i think you can apply this circuit to car system but for that u need to identify the voltage system of car. you should choose some appropriate locking mechanism too.

  21. mandy on Sat, 15th May 2010 1:39 am

    22. hi sir,
    can you please send me the programm of this code lock….i’ve tried it many times but still i have some problems……

  22. mandy on Sat, 15th May 2010 1:41 am

    23. can you send me the programme for this……it’ll be really appreciated

  23. Vicky on Thu, 8th Jul 2010 9:41 pm

    24. Sir, can you plz email me the assembly code for this project.. I shall be thankfull

  24. admin on Fri, 9th Jul 2010 3:03 am

    25. no dude…i cant, i dont work with assembly

Tell me what you're thinking...
and oh, if you want a pic to show with your comment, go get a gravatar!





Anti-Spam Protection by WP-SpamFree