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.The input is taken from a 4x3 Keypad (please see the schematic for more information) and Display the user input on a 2x16 LCD. A pin is assigned as output for activating and deactivating the lock. For demonstration i have connected an LED to that pin.

referanc ....etc

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ppt for keyboard interfacing with 8051
ppt for keyboard interfacing with 8051 ....etc

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Combination Lock with LCD and Keypad using pic16f628A:

A Brief Description:

This project is written in C language. The basic user lock is of 2 Digits.
The input is taken from a 4x3 Keypad (please see the schematic for more information) and Display the user input on a 2x16 LCD. A pin is assigned as output for activating and deactivating the lock. For demonstration I have connected an LED to that pin.


How combination lock works:

1. Turn switch on (5V DC voltage power supply)
2. A message name ....etc

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Dear Sir,
Kindly help to get some project about nano devices,to submit in my collage. ....etc

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Powering and Communicating with mm-size implants



Power sources for implants

Electromagnetic power transfer
10 to 1000 W/sq.mm
EM field radiated by transmitter in vitro.
Antenna in vivo receives EM energy.
Rectifier & regulator produce DC voltage.

Electromagnetic Power Transfer

Antenna
Size considerations.
Optimum frequency.

Safety consideration-
SAR-Specific Absorption Rate
A measure of the rate at which energy is absorbed by the body w ....etc

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i have very big problem to interfacing key pad with at89s52 with lcd. how is the asm code for this. i want to use keypad as when i press any key it should show on lcd.

if you will help me i will always greatful to you.
thanks
[email protected] ....etc

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To get full information or details of digital code lock with lcd and keypad using at89c2051 please have a look on the pages

http://seminarsprojects.net/Thread-digital-code-lock-with-lcd-and-keypad-using-at89c2051

http://seminarsprojects.net/Thread-ppt-digital-code-lock-with-lcd-and-keypad-using-at89c2051-ppt--41343?pid=87732&mode=threaded

if you again feel trouble on digital code lock with lcd and keypad using at89c2051 please reply in that page and ask specific fields in digital code lock with lcd and keypad using at89c2051 ....etc

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To get full information or details of digital code lock with lcd and keypad using atmega16 please have a look on the pages

http://seminarsprojects.net/Thread-digital-code-lock-full-report

if you again feel trouble on digital code lock with lcd and keypad using atmega16 please reply in that page and ask specific fields in digital code lock with lcd and keypad using atmega16 ....etc

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please go through the following threads for more details on Digital Code lock with keypad and lcd using AT89c2051

http://seminarsprojects.net/Thread-digital-code-lock-with-lcd-and-keypad-using-at89c2051
http://seminarsprojects.net/Thread-digital-code-lock-full-report ....etc

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Abstract

A keypad consists of 3 columns and 4 rows, hence the name, whenever the user taps one button, the column and the row corresponding to that button are shorted, for example, if a user chooses to tap the 5 button, col2 and row2 are shorted, if a users picks 0 button, col2 and row4 are shorted, and so on.

So how do you read a keypad using a Microcontroller?
the method used to read such input is called Scanning, you connect the rows and the columns to the microcontroller, you set the columns as outputs, rows as inputs (or vice versa) ....etc

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