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

Sat Feb 24 2018, 09:05 AM
Aaquib
I want help for digital ic tester
ExperimenterUK
Tue Feb 20 2018, 09:31 PM
Join up.. and post your problem
Mon Feb 19 2018, 04:47 PM
ashishkumar
i needs help for my project
Mon Feb 19 2018, 04:46 PM
ashishkumar
can i join you guys
ExperimenterUK
Mon Feb 05 2018, 03:08 AM
Hi Dave. Good to see you.
DavesGarage
Wed Jan 10 2018, 01:25 AM
It's been a few years since I poked around here - Hi all...
ExperimenterUK
Tue Jan 09 2018, 12:49 AM
Hi TPS. it's been a while..
۞ TPS ۞
Mon Jan 08 2018, 12:12 AM
hello
Thu Jan 04 2018, 07:20 PM
sayyad affrid
its AT89S52
Thu Jan 04 2018, 07:20 PM
sayyad affrid
sir, i want embedded c code for ultrasonic sensor having buzzer interfaced with AT9S52

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Comments

Daro12_76
Wed Feb 21 2018, 05:01 PM
radhikanathani
Wed Feb 21 2018, 06:55 AM
Narayani
Wed Feb 21 2018, 04:10 AM
Parth09
Tue Feb 20 2018, 07:53 AM
goutham
Mon Feb 19 2018, 02:49 AM
kks
Sun Feb 18 2018, 05:59 PM
justotemon
Sat Feb 17 2018, 07:14 AM
nicolekristen
Fri Feb 16 2018, 12:19 PM

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Forum Activity
Ansh12 Avatar
Posted By Ansh12
Fri Feb 23 2018, 07:10 PM
sbit E = P0^7; //E pin for LCD //use port 0sb...
ExperimenterUK Avatar
Posted By ExperimenterUK
Fri Feb 23 2018, 02:43 PM
sbit NOT #definesbit E = P0^7; //E pin for LCD ...
Ansh12 Avatar
Posted By Ansh12
Fri Feb 23 2018, 01:55 PM
change your defines tosbit E = P0^7; //E pi...
ExperimenterUK Avatar
Posted By ExperimenterUK
Fri Feb 23 2018, 01:12 AM
Add pull- ups for EN and RS.change your defines t...
Ansh12 Avatar
Posted By Ansh12
Thu Feb 22 2018, 01:36 AM
Can you post your Proteus files.ExperimenterUKThan...
ExperimenterUK Avatar
Posted By ExperimenterUK
Wed Feb 21 2018, 09:07 PM
The code you refer to is to drive the circuitshown...
ExperimenterUK Avatar
Posted By ExperimenterUK
Wed Feb 21 2018, 05:41 PM
Can you post your Proteus files.You will need pull...
radhikanathani Avatar
Posted By radhikanathani
Wed Feb 21 2018, 02:39 PM
I want to design a system for vehicle tracking and...
Narayani Avatar
Posted By Narayani
Wed Feb 21 2018, 04:17 AM
Hello,Your tutorial really helped me understand st...
Ansh12 Avatar
Posted By Ansh12
Wed Feb 21 2018, 12:53 AM
while(1) { key = Get_key(); // Get p...