Car Security System Using Auto Dialling System

Submitted by-Devna Sharma (176)Durgesh Baranwal (179)Mohit Arora (216)Nishtha Sharma (229)

Mentor:Dr. Pradeep Kumar Rana

Introduction

The aim of the project is to design an automated system that controls the movement of car using DTMF tone, in case if car is stolen.

In this system, if there is any unauthorized switching on of car, the mobile attached to car's system will automatically dial up the last number.

As the caller of the number picks the call, he presses a certain button and car's ignition goes off.

Autodialling system

Circuit diagram

Block Diagram

Components used

IC 8870 DTMF DecoderIC 89S52 ( 40 PIN controller)Relay -9 VOLTSAMSUNG Mobilephone Handsfree KitPCB GeneralCrystal 3.58 MHz(1)Crystal 12 MHz (1)Optocoupler PC 817 (2)NPN Transistor BC 548(4)

Components usedPNP Transistor BC 558 (3)Capacitor:10 mfd (1) 1000mfd (2)0.1(104) mfd Gas SensorThermal SensorPiezo Sensor (4)Push to on switch (2)led (1)Buzzer(1)Resistor:22K OHM (2), 470 OHM (4), 1K (6)

AC supply

AC SUPPLY In addition to the full wave rectifier circuit ,we have added, a voltage regulator to maintain the output voltage at 5V.

the capacitor(uf) nullifes the effect of the voltage regulator.

DTMF decoder DTMF keypad frequencies (with sound clips)

1209 Hz

1336 Hz

1477 Hz

1633 Hz

697 Hz 1 2 3 A

770 Hz 4 5 6 B

852 Hz 7 8 9 C

941 Hz * 0 # D

DTMF Decoder Dual-tone multi-frequency signaling (DTMF) is

used for telecommunication signaling over analog telephone lines in the voice-frequency band

The DTMF system uses eight different frequency signals transmitted in pairs to represent sixteen different numbers, symbols and letters

The DTMF keypad is laid out in a 4×4 matrix.

DTMF is basically a signal to the phone company that you generate when you press an ordinary telephone's touch keys

Creating circuit having H-bridges which drives the motor.

To control a movement of the dc motor we require a H bridge circuit.

H bridge is a combination of the 4 transistor circuit.

Two transistor’s are npn and two transistor’s are pnp transistor.

With the help of this four transistor circuit we control the movement of the motor automatically.

Creating circuit having H-bridges which drives the motor.

Creating Auto Dial-up circuit relay logic .Using this relay logic,handsfree redials the

last number store in the mobile.Relay logic is used for the autodialup circuit.we connect a one relay coil with the controller with two

transistor circuit.

Creating Auto Dial-up circuit relay logic

Methodology

Case 1: When intruder presses the start switch

Case 2: When the sensors

detects anything

Autodialling circuit activated

Proposed Plan • 1st-2nd weeks – Literature Survey• 3rd week – Component study• 4th week – Procuring Component• 5th-6th week – Study of embedded language• 7th week – Circuit design• 8th week – circuit implementation and corrections (if any)• 9th -10th week – Microcontroller Programming• 11th-12th week – Hardware implementation• 13th-14th week – Final project report, model and presentation

submission

Future Aspects We can add multiple sensors apart from the one we

have already used.a) One of them being motion sensor which will comprise of reciever, transmitter and modem.

b) Since we are also using a cell phone in our project, the cell can be also used as a GPS navigator.

c) A smart mobile charging function can also be added in the circuitry.

REFERENCES http://www.atmel.com/dyn/resources/prod_documents/doc2487.pdf - for details

of 8951 MC http://www.keil.com/dd/docs/datashts/atmel/at_c51ism.pdf - instruction set of

atmel 89s http://www.pcbased.in/8051-microcontrollers/89s51-architecture-instruction-

set-tutorials--89S51-microcontrollers.asp - PIN DESCRIPTION OF 89S51 http://www.siongboon.com/projects/2005-07-18_dtmf_circuits/ - for dtmf ic 8870 http://www.digchip.com/datasheets/download_datasheet.php?id=541970&part-

number=M-8870 - for studying 8870 http://www.freewebs.com/maheshwankhede/dtmfdecoder.html - interfacing

8051 with dtmf decoder http://www.societyofrobots.com/robotforum/index.php?topic=4786.0 - forum on

robotics discusing dtmf use www.tech-faq.com/dtmf.html - studying dtmf http://www.intlsensor.com/fumigation.html - gas sensor http://www.doctronics.co.uk/555.htm

THANK YOU