PASSWORD BASE DOOR LOCK SYSTEM USING ATMEGA8

INTRODUCTION:

Using embedded system we have created a world which is safe and more reliable. To make it safer today we are going to introduce you to password based door lock system. The traditional lock systems are not safe as anyone can break them. But the digital lock system are genuine consisting of a keypad which is installed at the side hedge of the door, through which password can be entered and the door will only open in case of password match.

CIRCUIT DIAGRAM: 

 

TECHNICAL DESCRIPTION:

A). HARDWARES:

1. Micro controller:

Atmega8 is the 8 bit microcontroller which belongs to Atmel family. It is operationally rich, which could perform various operations like PWM, UART, SPI, I2C, ADC etc.

2. DC motor:

The L – shape single shaft dc BO motor provides good torque. Small size and light weight makes it suitable for the circuit.

4. L293d:

L293D is a motor driver IC which uses H- bridge network to control the speed of motor. It is frequently used in robots due to its small size.

5. LCD:

Liquid crystal display is the display device which is thinner than the CRT. It is very simple device which is commonly used in many circuits.

6. Push Button

B). SOFTWARE:

1. Atmel Studio
2. Proteus

WORKING:

Working principle of this project is very simple. The software part is written in Atmel Studio in Embedded C and verified on Proteus. There is a keypad which is formed by using 16 push buttons. When we will press these buttons then Atmega8 microcontroller will start getting the value corresponding to the button. Once we enter the 4 digit password, the Atmega8 microcontroller compares it with the already stored password. In case of password match, the motor will start rotating and there will be a message appearing on the LCD as “Matched”. Otherwise the motor will remain still and now the message on the LCD will be “Wrong Password”.

CONCLUSION:

The password based door lock system is a simple project which provides high security and we can make it by using commonly available components. It can be used at residential places or in an organization to keep secure the confidential information. The main disadvantage of this project is once you will forget the password then it will be too hard to open the door. 

 

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