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digital code lock with lcd and keypad

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Moderators: Ajay, Junied , abbas1707, Arun Kumar V, pdi33, Shailesh NAYAK, ۞ TPS ۞, shyam, sashijoseph

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electronicfreak

Thu May 22 2008, 02:22PM

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sorry sir ,
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....

SACHIN
http://belgaum.myminicity.com/

Ajay

Thu May 22 2008, 03:53PM

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password stored in eeprom?
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

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migs

Tue Jun 10 2008, 07:38AM

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thanks for having this prototype posted here.. i just want to ask something.. are the two capacitors near the crystal oscillator 33uF or 33pF??.. if those are 33pF, then there is no available electrolytic capacitor with such rating.. the schematic symbol of those two represents an electrolytic one, as can be seen in the schematic diagram.. are those capacitors electrolytic or ceramic?? thanks again!

Ajay

Tue Jun 10 2008, 05:58PM

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migs, sorry if my schematic makes you think that way.
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!

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singh

Sat Aug 23 2008, 11:24AM

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sir,
the code limit of ic is 2k.but the size of hex file is more than it then what to do....?

singh

pdi33

Sat Aug 23 2008, 11:43AM

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hi singh,
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.

[ Edited Sat Aug 23 2008, 11:44AM ]

* inspired to develop,developing to inspire *

bkwu

Mon Aug 25 2008, 03:05AM

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Sir Ajay, im having a project which is similiar with the one you have uploaded,it is given that the design involves a microcontroller interfaced to a LCD and Keypad which activates an output line based on the key-code combination given to the input. The system works as a electronic lock with a user key and a master key. The master key is used to change the user keys, while the user keys are used to open or close a door or a set of doors.

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 !

Ajay

Mon Aug 25 2008, 01:40PM

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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!

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bkwu

Wed Aug 27 2008, 11:18PM

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ok thanks alot for the advise. i have roughly read through the book since i had an exam few weeks ago. im going to have group discussion to do the PCB diagram & the flow chart tonight. Then will start to do the hardware and software starting from tmr. will ask you here if i face any problem ! thanks ~