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This work is licensed under a Creative Commons Attribution-Noncommercial 2.5 India License.Rickey's World Disclaimer Ajay Bhargav - contact@nospam.com contact@nospam.com Mon, 01 Dec 2008 13:30:57 -0800 Mon, 01 Dec 2008 13:30:57 -0800 http://backend.userland.com/rss e107 (http://e107.org) 60 Search Search 8051 Microcontroller Projects AVR PIC Projects Tutorials Ebooks Libraries codes query http://www.8051projects.net/search.php digital code lock with lcd and keypad http://www.8051projects.net/forum-t4940.html Fri, 18 Jan 2008 22:46:02 -0800 http://www.8051projects.net/forum-t4940.html Re: digital code lock with lcd and keypad http://www.8051projects.net/forum-t4940.html what you did not understand in the circuit? what part is not clear to you.. please provide more details about your doubt.]]> Ajay<contact@nospam.com> Sat, 19 Jan 2008 11:49:36 -0800 http://www.8051projects.net/forum-t4940.html Re: digital code lock with lcd and keypad http://www.8051projects.net/forum-t4940.html sheryl<shreyzspace@nospam.com> Sat, 19 Jan 2008 22:27:32 -0800 http://www.8051projects.net/forum-t4940.html Re: digital code lock with lcd and keypad http://www.8051projects.net/forum-t4940.html sheryl<shreyzspace@nospam.com> Sat, 19 Jan 2008 22:29:34 -0800 http://www.8051projects.net/forum-t4940.html Re: digital code lock with lcd and keypad http://www.8051projects.net/forum-t4940.html for keypad and its working read the keypad tutorial
and for LCD read the LCD tutorial. Tutorials are located over here....
http://www.8051projects.net/microcontroller-tutorials/

it will give you complete working of keypad and LCD and the circuit consist of these components only... so you wont have any problem understanding the codes..]]> Ajay<contact@nospam.com> Sun, 20 Jan 2008 00:23:45 -0800 http://www.8051projects.net/forum-t4940.html Re: digital code lock with lcd and keypad http://www.8051projects.net/forum-t4940.html monsieur<excelsohal04@nospam.com> Sat, 03 May 2008 00:44:41 -0700 http://www.8051projects.net/forum-t4940.html Re: digital code lock with lcd and keypad http://www.8051projects.net/forum-t4940.html Ajay<contact@nospam.com> Sun, 04 May 2008 15:13:40 -0700 http://www.8051projects.net/forum-t4940.html Re: digital code lock with lcd and keypad http://www.8051projects.net/forum-t4940.html thanx 4 replyin .... sir m using 4x3 SPST switches keypad....... i made it my self . is it ok to use spst switches . also u dont mention ny datasheet of LCD tht ur usin. Which lcs shud b used]]> monsieur<excelsohal04@nospam.com> Sun, 04 May 2008 22:26:20 -0700 http://www.8051projects.net/forum-t4940.html Re: digital code lock with lcd and keypad http://www.8051projects.net/forum-t4940.html
and the reason i provided the keypad circuit is so that you can make it yourself. Try to run the hardware to see if its working. Make sure your connections are tight..]]> Ajay<contact@nospam.com> Mon, 05 May 2008 16:29:17 -0700 http://www.8051projects.net/forum-t4940.html Re: digital code lock with lcd and keypad http://www.8051projects.net/forum-t4940.html monsieur<excelsohal04@nospam.com> Tue, 06 May 2008 20:38:04 -0700 http://www.8051projects.net/forum-t4940.html Re: digital code lock with lcd and keypad http://www.8051projects.net/forum-t4940.html lockicon, unlockicon, ok and ex are arrays to create custom character for LCD. Just check the LCD tutorial for how the hex values are calculated.]]> Ajay<contact@nospam.com> Wed, 07 May 2008 14:52:32 -0700 http://www.8051projects.net/forum-t4940.html Re: digital code lock with lcd and keypad http://www.8051projects.net/forum-t4940.html 23.jpg

sir, i hv used the switch(shown in red circle) for making the 4x3 keypad.......... is it ok to use these... wil it work]]> monsieur<excelsohal04@nospam.com> Thu, 08 May 2008 04:22:43 -0700 http://www.8051projects.net/forum-t4940.html Re: digital code lock with lcd and keypad http://www.8051projects.net/forum-t4940.html i.e. if you press button, it should not stay there.. it must come back to normal position after release.]]> Ajay<contact@nospam.com> Thu, 08 May 2008 16:55:52 -0700 http://www.8051projects.net/forum-t4940.html Re: digital code lock with lcd and keypad http://www.8051projects.net/forum-t4940.html you need to enter key with row and column combination. I cannot explain this

coz its not easy to explain even.]]> Ajay<contact@nospam.com> Fri, 09 May 2008 14:48:24 -0700 http://www.8051projects.net/forum-t4940.html Re: digital code lock with lcd and keypad http://www.8051projects.net/forum-t4940.html sir actually in the lab we hv a controller board(made by advanced technology). its got faullty. now our evaluation is on thursday. so we hv to show it on KEIL.So we did it... but we dont know wht to enter in the ports at which iinstant as algo. of this program is not clear to me. So plz tell me the steps to simulate it....... so tht Sir wil be convinced tht i hv understood the program and its working..]]> monsieur<excelsohal04@nospam.com> Thu, 08 May 2008 20:50:48 -0700 http://www.8051projects.net/forum-t4940.html Re: digital code lock with lcd and keypad http://www.8051projects.net/forum-t4940.html monsieur<excelsohal04@nospam.com> Fri, 09 May 2008 22:59:56 -0700 http://www.8051projects.net/forum-t4940.html Re: digital code lock with lcd and keypad http://www.8051projects.net/forum-t4940.html sashijoseph<sashijoseph@nospam.com> Sat, 10 May 2008 22:28:03 -0700 http://www.8051projects.net/forum-t4940.html Re: digital code lock with lcd and keypad http://www.8051projects.net/forum-t4940.html ]]> Ajay<contact@nospam.com> Sun, 11 May 2008 16:29:29 -0700 http://www.8051projects.net/forum-t4940.html Re: digital code lock with lcd and keypad http://www.8051projects.net/forum-t4940.html my project is digital lock.....]]> electronicfreak<sachin.kolkar@nospam.com> Wed, 21 May 2008 14:04:07 -0700 http://www.8051projects.net/forum-t4940.html Re: digital code lock with lcd and keypad http://www.8051projects.net/forum-t4940.html ]]> Ajay<contact@nospam.com> Thu, 22 May 2008 00:46:14 -0700 http://www.8051projects.net/forum-t4940.html Re: digital code lock with lcd and keypad http://www.8051projects.net/forum-t4940.html actually i m working on digital key lock project.
i thought that i will get data displayed on LCD to compare password stored in EEPROM..
can u send me the C code of this project & circuit diagram....]]> electronicfreak<sachin.kolkar@nospam.com> Thu, 22 May 2008 14:22:03 -0700 http://www.8051projects.net/forum-t4940.html Re: digital code lock with lcd and keypad http://www.8051projects.net/forum-t4940.html i did not make that project yet. but when i make it.. i will surely upload it.

right now i have only the simple code lock project

]]> Ajay<contact@nospam.com> Thu, 22 May 2008 15:53:40 -0700 http://www.8051projects.net/forum-t4940.html Re: digital code lock with lcd and keypad http://www.8051projects.net/forum-t4940.html ]]> migs<janmichaelgonzales@nospam.com> Tue, 10 Jun 2008 07:38:34 -0700 http://www.8051projects.net/forum-t4940.html Re: digital code lock with lcd and keypad http://www.8051projects.net/forum-t4940.html Those are 33pF ceramic capacitors. If they are not available then you can try looking for 22pF. I will recheck the schematic and make the changes if needed.
Thanks!]]> Ajay<contact@nospam.com> Tue, 10 Jun 2008 17:58:25 -0700 http://www.8051projects.net/forum-t4940.html Re: digital code lock with lcd and keypad http://www.8051projects.net/forum-t4940.html the code limit of ic is 2k.but the size of hex file is more than it then what to do....?]]> singh<asingh_202@nospam.com> Sat, 23 Aug 2008 11:24:34 -0700 http://www.8051projects.net/forum-t4940.html Re: digital code lock with lcd and keypad http://www.8051projects.net/forum-t4940.html if u are talking of the hex file size shown on the PC, then u need not worry as that has no relation to the actual size of the code being downloaded to the uC.The code size is actually the no. of machine language op-code bytes ( u can see them on the PC if u open the hex file using notepad) and the hex file size shown in the windows explorer is the size occupied by the hex file on the hard disk of ur PC.]]> pdi33<islurpundalik@nospam.com> Sat, 23 Aug 2008 11:43:12 -0700 http://www.8051projects.net/forum-t4940.html Re: digital code lock with lcd and keypad http://www.8051projects.net/forum-t4940.html
also, regarding guidance and help, We are always here to help you. I am sure you will do best.
Best of luck!

]]> Ajay<contact@nospam.com> Mon, 25 Aug 2008 13:40:25 -0700 http://www.8051projects.net/forum-t4940.html Re: digital code lock with lcd and keypad http://www.8051projects.net/forum-t4940.html
it has 3 doors, i need to have 8 set of key, 1st set of key will open door A, 2nd open the B, 3rd open C, 4th open A&B, 5th open B&C, 6th open A&C, 7th open ABC, 8th is the master key.

for the securities features, when the user enters a wrong key, the system should warn the user using a short beep. If the user enters wrong keys consecutively for the third time, the system should enable a red LED. Any key pressed should be discarded and the system should beep on press of any key.

may i know that what is the difference between my assigment, with the one you made ? it seems that it is the combination of your project, Digital Code lock with LCD and Keypad using AT89C2051 and the 1 Mr Binu J did, Microcontroller Based Digital code Lock (AT89C2051). is there any hardware that i need to add in my project ? For the programming part, which part is it should i modify ?

anyone pls answer my question ? im facing big problem to start this project because i've never study anything about up & uc before this.. it seems very difficult for a beginner , but i would try my best to finish it ! Thanks alot to those who are willing help me !]]> bkwu<bkwu88@nospam.com> Mon, 25 Aug 2008 03:05:33 -0700 http://www.8051projects.net/forum-t4940.html Re: digital code lock with lcd and keypad http://www.8051projects.net/forum-t4940.html Ajay<contact@nospam.com> Thu, 28 Aug 2008 12:35:17 -0700 http://www.8051projects.net/forum-t4940.html Re: digital code lock with lcd and keypad http://www.8051projects.net/forum-t4940.html bkwu<bkwu88@nospam.com> Thu, 28 Aug 2008 11:09:57 -0700 http://www.8051projects.net/forum-t4940.html Re: digital code lock with lcd and keypad http://www.8051projects.net/forum-t4940.html bkwu<bkwu88@nospam.com> Wed, 27 Aug 2008 23:18:55 -0700 http://www.8051projects.net/forum-t4940.html Re: digital code lock with lcd and keypad http://www.8051projects.net/forum-t4940.html always here..]]> Ajay<contact@nospam.com> Thu, 28 Aug 2008 00:00:54 -0700 http://www.8051projects.net/forum-t4940.html Re: digital code lock with lcd and keypad http://www.8051projects.net/forum-t4940.html

]]> bkwu<bkwu88@nospam.com> Thu, 28 Aug 2008 21:33:19 -0700 http://www.8051projects.net/forum-t4940.html Re: digital code lock with lcd and keypad http://www.8051projects.net/forum-t4940.html Ajay<contact@nospam.com> Fri, 29 Aug 2008 07:29:18 -0700 http://www.8051projects.net/forum-t4940.html Re: digital code lock with lcd and keypad http://www.8051projects.net/forum-t4940.html

]]> bkwu<bkwu88@nospam.com> Sat, 30 Aug 2008 08:50:57 -0700 http://www.8051projects.net/forum-t4940.html Re: digital code lock with lcd and keypad http://www.8051projects.net/forum-t4940.html
now regarding schematic, simply remove those LEDs from base of transistors. also drive speaker o/p using transistor instead of driving it from controller as controller wont be able to provide enough current.]]> Ajay<contact@nospam.com> Sat, 30 Aug 2008 13:25:56 -0700 http://www.8051projects.net/forum-t4940.html Re: digital code lock with lcd and keypad http://www.8051projects.net/forum-t4940.html Ajay wrote ...

bkwu, i really suggest you to go through your study material first as that is something which is needed for you. Later on you can try your hands on programming microcontroller.Also side by side try working on C too.

also, regarding guidance and help, We are always here to help you. I am sure you will do best.
Best of luck!

hi mr.ajay.. let say my c language for particular project done..
so, my question here,do we have any related software to convert this C to ASM..
if so, can u give me a link.

]]> wan<one366_wan@nospam.com> Sun, 21 Sep 2008 23:21:58 -0700 http://www.8051projects.net/forum-t4940.html Re: digital code lock with lcd and keypad http://www.8051projects.net/forum-t4940.html may i know how can i display * on the lcd ? i mean what is the code for '*'
and then how to display more than 1 '*' ? do i need to MOV A, #'*' to the lcd for 3 times if i wan to display 3 * ?
because we are trying to make it to display a * on the lcd when input 1 character, 2 '*' when input 2 char and so forth.
we appreciate anyone who could help us to solve the question. thanks !]]> bkwu<bkwu88@nospam.com> Mon, 22 Sep 2008 04:16:28 -0700 http://www.8051projects.net/forum-t4940.html Re: digital code lock with lcd and keypad http://www.8051projects.net/forum-t4940.html
for each input character from keypad you can Echo a * on the LCD.

Arun]]> Arun Kumar V<nura1002003@nospam.com> Mon, 22 Sep 2008 06:42:20 -0700 http://www.8051projects.net/forum-t4940.html Re: digital code lock with lcd and keypad http://www.8051projects.net/forum-t4940.html Ajay<contact@nospam.com> Wed, 24 Sep 2008 06:44:18 -0700 http://www.8051projects.net/forum-t4940.html