BY

R.SURESH (16705A0426)B TECH II Year I Sem

ELECTRONICS & COMMUNICATION ENGINEERING

ANNAMACHARYA INSTITUTE OF TECHNOLOGY AND SCIENCES(AN AUTONOMOUS INSTITUTION)

(Approved by AICTE,NEW DELHI & Affiliated to J.N.T.U Anantapuramu)New Boyanapalli, RAJAMPET-516 126 (A.P)

ATECHNICAL SEMINAR

ON

Automatic Engine Locking System for Drunken Drivers

Contents: Aim Introduction to embedded systemsIntroduction for microcontroller based automatic engine locking system for drunken

driversBlock diagram of projectPower supplyMicrocontroller Alcohol detection sensorBuzzer driver circuitTransformerLCDMotorsLM324 op-ampAdvantagesApplicationsFuture enhancementConclusion

Aim:

The main purpose behind this project is “Drunken driving detection”. Now-a-days, many accidents are happening because of the alcohol consumption of the driver. Thus drunk driving is a major reason of accidents in almost all countries all over the world.

Introduction to Embedded systems: An embedded system is one that has computer-hardware with

software embedded in it as one of its most important component. It is a dedicated computer-based system for an application(s) or product.

An embedded system has three main components.1. It has hardware 2. It has main application software.3. It has a real time operating system (RTOS)

An embedded system has software designed to keep in view three constraints:

(i) Available system memory.(ii) Available processor speed.(iii) The need to limit power dissipation when running the system

continuously.

Introduction to Microcontroller based automatic engine locking system for drunken drivers Most of these days, we hear lot of accidents due to drunken driving.

Drunken drivers will not be in stable condition and so the rash driving is the inconvenience for other road users and also question of life and death for the drunken driver and for others.

The system uses a compact circuitry built around Flash version of AT89S52 microcontroller with a non-volatile memory capable of retaining the password data for over ten years. Programs are developed in embedded C.  ISP is used to dump the code into the microcontroller.

Block diagram:

Alcohol Detection sensors

AT89S52Micro

Controller

Buzzer

LM324

Power supply

Motors

Power supply:

The above process is needed for the conversion of AC to DC using rectifier and then ripples are removed using filter circuit(capacitor).

Here we use 7805 voltage regulator.

Micro controller:

Fig: 8051 microcontroller pin diagram

Alcohol detection sensor:The alcohol detection sensor used in our project is MQ-3 sensor.

Fig: MQ-3 alcohol detection sensor

Buzzer driver circuit:Microcontroller pins are not sufficient to drive circuits like relays and buzzers.So we use driver circuit in between microcontroller and buzzer.This complete structure is known as buzzer driver circuit.

AT89S52Micro

Controller

Driver circuit

Buzzer

Fig: Buzzer driver circuit

TRANSFORMER:

LCD:

LCD (Liquid Crystal Display) screen is an electronic display module and find a wide range of applications. A 16x2 LCD display is very basic module and is very commonly used in various devices and circuits. A 16x2 LCD means it can display 16 characters per line and there are 2 such lines.

Fig: LCD pin diagram

Motors:Here we use DC motors.The speed of a DC motor is directly proportional to the supply voltage.If we reduce the supply voltage from 12 Volts to 6 Volts, the motor will run at

half the speed.

LM324 op-amp:The LM324 series are low-cost, quad op-amps with true differential inputs.They have several distinct advantages over standard operational amplifiers.Single Supply Operation: 3.0 V to 32 V (LM224, LM324, LM324A).Low Input Bias Currents: 100 nA Maximum (LM324A).Four Amplifiers Per Package.

•Low cost.•Automated operation.•Low Power consumption.•It provides an automatic safety system for cars and other vehicles as well.

Advantages:

•“Alcohol Detector project” can be used in the various vehicles for detecting whether the driver has consumed alcohol or not.•This project can also be used in various companies or organization to detect alcohol consumption of employees.

Applications:

Future enhancement: We can implement GSM technology to inform the relatives or

owners of the vehicle about the alcohol consumption. We can implement GPS technology to find out the location of

the vehicle.

Conclusion:In this project we have developed a real time model that can automatically lock the engine when a drunken driver tries to drive a car. Now-a-days car accidents are mostly seen. By fitting this alcohol sensor into the car, we can save guard the life of the driver and also the remaining passengers.

References:Embedded systemsMicrocontroller AT89S52www.wikipedia.orgwww.atmel.comPassive Alcohol Sensors Tested in 3 States of Youth Alcohol

Enforcement-NHSA(1996)

QUERIES ?