Post on 21-Dec-2015
description
transcript
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: