Digital Code Lock with LCD and Keypad

Digital Code Lock with LCD and Keypad using AT89C2051

A Brief Description:
This project is written in C language. 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. User has maximum of 3 retries.. if fails then Master Locks ha... Read Compelte post
Posted on Wed Aug 29 2007, 12:00 PM

Caller id project

First of all talking about the circuit. I will give a brief description of the ICs used.
1. MT8870: A DTMF decoder IC, parallel o/p.
2. AT89C2051: 8051 Controller
3. LCD: For display
4. MCT 2E: Opto coupler to check the receiver is picked or not.

Now Software..
The code is really simple, at the top is ports definition. Defining the MT8870 interface as..

... Read Compelte post

Posted by ajay_bhargav on Wed Jul 25 2007, 01:29 PM

Conversation

ExperimenterUK
Thu Jul 11 2019, 07:55 PM
@ramos https://www.theengineeringprojects.com/2017/09/l298-motor-driver-library-proteus.html
ExperimenterUK
Thu Jul 11 2019, 07:44 PM
@praveen123. Can you give a link to the project ?
Thu Jul 11 2019, 04:47 PM
ramos
buenos dias alguien podria ayudarme necesito saber como descargar la libreria del l298n para proteus
Thu Jul 11 2019, 11:11 AM
praveen123
anyone can help me
Thu Jul 11 2019, 11:11 AM
praveen123
i need source code for 8051 -smart trolley rfid
Thu Jul 11 2019, 11:10 AM
praveen123
hii
ExperimenterUK
Thu Jun 27 2019, 09:14 PM
Hi.. good to see you again
۞ TPS ۞
Thu Jun 27 2019, 07:31 AM
Hello
AdiGhazi
Tue Jun 18 2019, 11:21 AM
Hlo Dear , I've to program AT89C51AC3 RT-LUM using flip but I'm getting time out error for RS232. Will you please suggest me which programmer will be supportable to program this Chip.
Sun Jun 16 2019, 07:48 PM
hanoch Taub
i need to interface sim800 to 8051, the problem is that on the module sim800 there are 9 pins connector and I don't know how to connect him to 8051, which pins to tx and rx on 8051 module sim there is

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3AAPC
Sun Jul 21 2019, 12:41 AM
rpels7707
Fri Jul 19 2019, 11:31 AM
ameya123
Fri Jul 19 2019, 07:36 AM
anhsieuno
Thu Jul 18 2019, 11:39 AM
zxcvbnm1234
Sat Jul 13 2019, 07:09 AM
surajghayal
Wed Jul 10 2019, 01:17 PM
figureyang
Fri Jul 05 2019, 04:25 AM
mousompal
Sat Jun 29 2019, 05:02 PM

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Posted By 3AAPC
Sun Jul 21 2019, 12:51 AM
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Posted By 3AAPC
Sun Jul 21 2019, 12:47 AM
With the GPS antenna in the outdoors, I use the ub...
ameya123 Avatar
Posted By ameya123
Fri Jul 19 2019, 07:42 AM
Hello,Please share 8051 Assembly language code for...
figureyang Avatar
Posted By figureyang
Fri Jul 05 2019, 04:37 AM
here is the source code prepared for you download ...
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Fri Jul 05 2019, 04:30 AM
Cheap_Flash_FS(Normal Version)--Embedded FAT16/32 ...
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Posted By wimac
Sat Jun 22 2019, 01:26 PM
I’ve use the AT89C51ED2 which has a similar progra...
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Posted By ExperimenterUK
Thu Jun 20 2019, 10:08 PM
baud rate is 9600 at stop bits of 2. AdiGhaziThe u...
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Posted By AdiGhazi
Thu Jun 20 2019, 05:24 AM
Dear,I'm using RS232 serial port cable to use flip...
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Posted By ExperimenterUK
Tue Jun 18 2019, 10:19 PM
Okay.. I have never programmed the AT89C51AC3 or ...
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Posted By AdiGhazi
Tue Jun 18 2019, 11:20 AM
Hlo Dear ,I've to program AT89C51AC3 RT-LUM using ...