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digital code lock with lcd and keypad

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bkwu

Thu Aug 28 2008, 11:09AM

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erm sir, could you list out the component of your project for me ? cause i dont know whats the name of the component, i need to buy it to build my hardware. should i add a piezo transducer or loudspeaker to make it to create the sound 'beep' ? To have the LED to replace the gate, means that i need to have total of 3 LED ? what is the component Y1 11.0592MHz ? is that the piezo transducer ?

[ Edited Thu Aug 28 2008, 11:32AM ]

Ajay

Thu Aug 28 2008, 12:35PM

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11.0592Mhz is crystal used to provide clock to controller. I am really surprised that you dont know about loudspeaker, but anyways, you can tell the shopkeeper to give you buzzer or a beeper, this buzzer is same speaker you have in your CPU (computer). you can go to spare shop for computers and look for that beeper or computer speaker or buzzer.

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bkwu

Thu Aug 28 2008, 09:33PM

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can you help me to check does this schemetic diagram fit with what i want ?

Ajay

Fri Aug 29 2008, 07:29AM

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there seems to be some problem with image you posted, i am not able to open it. can you use www.imageshack.us to upload image?

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bkwu

Sat Aug 30 2008, 08:50AM

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http://img56.imageshack.us/img56/425/schemeticdiagramtm8.jpg

Ajay

Sat Aug 30 2008, 01:25PM

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well in that schematic, you mentioned at89c2051, where that controller does not have port 2 in it. however you can use a different controller instead of at89c2051 like at89c51 which has 4 ports, keeping all the connections same. You need to edit the code further to make those relays work.

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.

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wan

Sun Sep 21 2008, 11:21PM

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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.

[ Edited Sun Sep 21 2008, 11:27PM ]

bkwu

Mon Sep 22 2008, 04:16AM

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sir, now we are facing another problem with the lcd.
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 !

Arun Kumar V

Mon Sep 22 2008, 06:42AM

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for each input character from keypad you can Echo a * on the LCD.

Arun

Ajay

Wed Sep 24 2008, 06:44AM

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Do like this, copy the getinput routine and paste it in the same file with name getpasswordinput, keeping everything same, just while sending data to lcd, send '*' instead of key number.

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