Intro Labsguru Lgec001

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For Free Synopsis, Email us at [email protected], with Name, Email Id, Mobile Number, and College Name. LGEC001: DOOR LOCK SYSTEM USING GSM TECHNOLOGY/CELLPHONE 1. Scope of work/research and key features

Mobile/cell phone operated.

Understanding of DTMF tone and DTMF decoder integration.

Microcontroller programming in C language.

Understanding of ‘GSM Technology’.

Understanding of ‘Embedded system’

Understanding of the use of ‘Encoder & Decoder’

PCB designing and Circuit designing of DTMF circuit.

PPCB development, Component mounting and soldering.

Testing of the circuit.

2. Introduction

In this age of digital technology, every device and its operation has become digital based. Now with digital based door lock systems, it is easier to control the door movement of the car or house. The new automated door lock system does not need a key to lock or unlock the door of the car or house. This digital door entry system is in fact controlled by cell-phone which is actually performing the role of remote over here.

The keyless door remote is an electronic circuit based device. This remote transmits DTMF signals via air to another device of the system installed in the car door or house door.. The keyless car remote can be operated from any corner of the world.

The working of this locking system is very simple. You just have to carry the cell phone with yourself and you can control the locks from anywhere without any problem. It works on the entry number. The owner has to press that entry number on the cell phone for controlling the locking system. The entry number is unique in nature and so is the remote device of an automatic keyless system.

You can install a keyless entry system in your house as well as in your vehicle. Now, a days theft cases are increasing everywhere and the key based locking system is no longer a safe option. It is quite easy for thieves and robbers to open the traditional key based doors either with duplicate keys or some other way. Therefore for safety of your house and vehicle, this system can be installed. With this system, you will never be in tension of leaving your house and vehicle out of your supervision. Not only this ,it also help us to move out of some really odd situations like you locked the door and left and in your absence other members came back and then they have to wait outside if they were not having key with themselves .


3. Motivation

Keyless entry has been a luxury whose availability is confined primarily to vehicles. The cell phone security system takes this idea of keyless entry and transforms it into a convenient, versatile security system that utilizes cell phone technology and the landline telephone network. By taking advantage of caller identification and dual-tone multi-frequency signaling, the security system has the ability to introduce two-levels of security. The first level will be decoding the calling party’s identification information while the second level would consist of the user attempting a password entry over the phone.. By combining the mobility of this telecommunication medium with microcontrollers, the system achieves a secure, convenient, and automated form of security for a place of residence.

4. Objective(s)

The fundamental requirements for the cell phone security system remained fixed throughout the design process. The goal was to design a system which would allow the user automated and convenient access to their home security system through a telephone network. The fundamental objectives of the system include:

Correctly decode the DTMF signals from the user2. Correctly decode caller identification information from the phone line

Allow the user to automatically lock the entryway.

Allow the user to automatically unlock the entryway.

5. Project Overview

The cell phone security system is the result of a fusion of a creative idea with an attempt to motivate change. Even though modern technology has allowed for the automation of many aspects of domestic lifestyles, from automatic motion sensing lights to automatic garage door openers, home security has not seen much benefit from this revolution. Household entry has long been a very manual routine with little effort to automate the process. Entry into a residence is still primarily limited to a manual process which involves inserting a key into a bolt and physically moving the locking-mechanism.

The cell phone security system aims to change this. The system takes advantage of the widespread acceptance of cell phones in today’s society in conjunction with the deep-rooted standards of the landline telephone network to introduce automation and convenience. The system will allow a user to use their cell phone to place a call into their home security system. Once the system verifies the caller, the caller is then allowed to attempt a password entry. Upon successfully entering a password, the system will automatically unlock the door and grant entrance. This automation introduces a form of secure, keyless entry into a residence along with the convenience of a fully responsive security system monitor. The system will primarily interface with telephony protocols which include dual tone multi frequency (DTMF), caller identification (CID), and some applicable telephony circuit standards. DTMF will be used to decode the button presses that form the


password. The telephony standards are necessary for implementing a correct interface that will allow the phone line to go on/off-hook. Properly understanding and interfacing with these standards is of utmost importance due to federal regulations as well as successful operation. The major components used in its designing are:

Decoder

Microcontroller

Cell phone as a remote

Relay

In this project user makes a call using mobile phone which will be received at the receiving section by another phone which is behaving like a receiver over there. In the course of the call, if any button is pressed control corresponding to the button pressed is heard at the other end of the call. This tone is called dual tone multi frequency tone (DTMF). The received tone is processed by the microcontroller with the help of DTMF decoder ,CM8870 the decoder decodes the DTMF tone in to its equivalent binary digit and this binary number is send to the microcontroller, the microcontroller is programmed to take a decision for any given input and outputs its decision to unlock/lock the system. DTMF assigns a specific frequency (consisting of two separate tones) to each key that can easily be identified by the electronic circuit. The signal generated by the DTMF encoder is the direct algebraic submission, in real time of the amplitudes of two sine (cosine) waves of different frequencies, i.e., pressing 5 will send a tone made by adding 1336 Hz and 770 Hz to the other end of the mobile.

A CM8870 series DTMF decoder is used here. All types of the mt8870 series use digital counting techniques to detect and decode all the sixteen DTMF tone pairs in to a four bit code output. The built-in dial tone rejection circuit eliminated the need for pre-filtering.

We will be using 8 bit ATMEL microcontroller AT89S8253. It is a low-power, high-performance CMOS 8-bit microcontroller with 12K bytes of In-System Programmable (ISP) flash program memory and 2K bytes of EEPROM data memory. It has 32 programmable input output lines. The resulting architecture is more code efficient. Outputs from port pins of the microcontroller are fed input pins of motor driver IC L293d, to drive geared motors.

6. Description of working

In order to operate the system you have to make a call to the cell phone attached to the locking system from any phone. The phone is picked at the receiving end through auto answer mode (which is in the phone, just enable it).

Each number on the cell phone keypad has a distinct sound (called DTMF tones). This sound is used to identify the key pressed using a CM8870 DTMF decoder. Here the sound is firstly pre-amplified by the microphone unit. This sound is now fed into the CM8870 IC which decodes them in form of binary units. These decoded numbers are fed into the microcontroller .It checks the correctness of the code. If the code is correct then relay energies and the lock is open .and in case code is not correct or somebody try to unlock by using some other way then it will give the alarm. .

Intro Labsguru Lgec001

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