B.Vineetha (11RQ1A0486)

G.Vaishnavi (11RQ1A0484)

M.Mounika (11RQ1A0439)

B.Soujanya (11RQ1A0468)

Contents: Aim

Introduction to embedded systems

Introduction for microcontroller based automatic engine locking system for drunken drivers

Block diagram of project

Power supply

Microcontroller

Alcohol detection sensor

Buzzer driver circuit

Transformer

LCD

Motors

LM324 op-amp

Advantages

Applications

Future enhancement

Conclusion

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

AT89S52

Micro

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.

AT89S52

Micro

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.

•“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.

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.

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 systems

Microcontroller AT89S52

www.wikipedia.org

www.atmel.com

Passive Alcohol Sensors Tested in 3 States of Youth Alcohol

Enforcement-NHSA(1996)

QUERIES..?