CODE LOCK FOR ELECTRICAL DEVICE

Objective:

The objective of this project is to lock a device using code or password and this

code lock can prevent unauthorized access to devices or solenoid operated electrical

devices.

Scope:

This project is very useful for industries and home appliances. Different

passwords are used to access different devices.

Methodology:

This project designed by following blocks:

Micro controller

LCD Display

EEPROM

Matrix Keypad

Relay

In this project, the matrix keypad is used to type the particular password to lock

ON/OFF for secured process. The keypad acts as an input and sends signals to

microcontroller for processing. The typed password will give to the input of

microcontroller. Here the microcontroller is the flash type reprogrammable

microcontroller in which we have already programmed the original password data and

stored in memory. Type of Program Memory is using built in EEPROM, This memory

can be re programmed many times. Now the microcontroller checks the original

password with current typed password. If the two passwords are match means the

microcontroller gives the pulse to driver circuit. The driver circuit is used for provide the

sufficient input voltage of relay. The relay will ON to open the lock. The LCD is used to

display “PASSWORD IS CORRECT”. Otherwise the password is wrong LCD is used to

display “PASSWORD IS INCORRECT” and cannot do any process, also gives alarm at

wrong entry.

Advantages:

This feature reduces the power consumption by the microcontroller.

Low Cost to assemble the project

Less maintenance for years

Applications:

It is very useful in the industrial company and home appliances.

Electrical devices such as Lights, Computer etc can be controlled by using

separate passwords.

Block Diagram: