This document describes a project to develop an automatic engine locking system for detecting alcohol levels in drivers. The system uses an alcohol sensor and microcontroller to read alcohol levels and lock the engine if levels exceed the limit. If detected, a buzzer will sound and a DC motor will turn on to simulate the engine locking process. The system aims to prevent drunken driving accidents. It discusses the hardware and software components used, including an ATmega8 microcontroller, LCD, sensor, motor driver, and more. Potential applications are in vehicles and workplaces to reduce alcohol-related accidents.

1. UNDER THE
GUIDANCE OF
DR.K.SEETHARAM
Associate professor
ECE Dept.
ALCOHOL DETECTION
WITH AUTOMATIC
ENGINE LOCKING
SYSTEM FOR DRUNKEN
DRIVERS
Submitted by:
B . Supriya (15493t1538)
A . Divya Jyothi (15493t1532)
A . Sravani (164931551l)
Y . Srikanth(15493t1520)

2. CONTENTS
 AIM OF THE PROJECT
 BLOCK DIAGRAM
 HARDWARE USED
 SOFTWARE USED
 ATMEGA8
 KEY FEATURES
 INTRODUCTION TO A 16*2 LCD
 ALCOHOL GAS SENSOR
 INTRODUCTION TO L293D
 INTRODUCTION TO DC MOTOR
 SCHEMATIC DIAGRAM
 ADVANTAGES
 APPLICATIONS
 CONCLUSION
 FUTURE SCOPE

3. Now a days we hear about 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 drivers, also for
others. In this project, we are developing an Auto Lock System.
The input for the system is from Detection Sensors either from
Alcohol Breath or any other mechanism. The controller keeps
looking for the output from these sensors. If there are any traces
of Alcohol above the set limit, then the system will lock the
Engine. Here a simulating process is activated using a DC
motor through the relay and the complete process is under the
supervision of an intelligent microcontroller
AIM:

4. ATMEGA8
POWER
SUPLLY
LCD
BLOCK DAIGRAM:
Alcohol
Sensor
Motor
driver
motor
BUZZER

5. HARDWARE USED:
•Microcontroller
•Power supply
•ATMEGA8
•LCD
•ALCOHAL SENSOR
•BUZZER
•MOTOR DRIVER
•MOTOR

6. SOFTWARE USED:
•AVRSTUDIO4/6
•PROTEOUS 7.7
•Embedded C
•PROGISP

7. ATMEGA8:

8. High-performance, Low-power Atmel AVR 8-bit
Microcontroller.
Advanced RISC Architecture
16MHz On-chip 2-cycle Multiplier
8Kbytes of In-System Self-programmable Flash
program memory
512Bytes EEPROM, 1Kbyte Internal SRAM
Write/Erase Cycles: 10,000 Flash/100,000 EEPROM.
Data retention: 20 years at 85°C/100 years at 25°C.
6-channel ADC
Programmable I/O Lines, 28-lead PDIP
4.5V - 5.5V (ATmega8)
Key features:

9. 8 February 2023
9
INTRODUCTION TO A 16*2 LCD
Liquid crystal display (LCD) are widely used in display modules. These LCDs
are used to display numbers, characters and special symbols of 5×7/5×10. Here
we see how to interface and display a single character with 16×2 character lcd
with Atmega8

10. 8 February 2023
10
Alcohol Gas Sensor
This alcohol sensor is suitable for detecting alcohol
concentration
on your breath, just like your common breathalyzer.
Sensor provides an analog resistive output based on
alcohol concentration.
The MQ-303A is a tin dioxide semiconductor gas sensor
which has a high sensitivity to alcohol with quick
response speed.

12. 12
INTRODUCTION
TO
L293D

13. L293D 8 February 2023
13
L293D:
L293D is a dual H-bridge motor driver integrated
circuit (IC).
Motor drivers act as current amplifiers since they
take a low-current control signal and provide a
higher-current signal.
L293D contains two in-built H-bridge driver
circuits.
In its common mode of operation, two DC
motors can be driven simultaneously, both in
forward and reverse direction.

14. INTRODUCTION
TO
DC MOTOR

15. 8 February 2023
15
DC motor:
A direct current (DC) motor is a widely used device that translates electrical pulses
into mechanical movement.
DC motor we have only + and –leads, Connecting them to a DC voltage source moves
the motor in one direction, By reversing the polarity, the DC motor will move in the
opposite direction.

16. SCHEMATIC DIAGRAM

17. ADVANTAGES:
Low cost
Simply design
To protect people for accident

18. APPLICATIONS:
Drunk Driving is one of the biggest threats to Road
Safety. Applications of Automatic Engine Locking System
Through Alcohol Detection can be used anywhere to
reduce the probability of road accidents.
Automatic Engine Locking System Through Alcohol
Detection project” can be used in various vehicles for
detecting whether the driver has consumed alcohol or not.
This can also be used in various companies,
organisations, mines to detect alcohol consumption of
employees.

19. In this paper a realistic social technique has been
proposed to eradicate the loss caused due to drunken
drivers. It has also been assured in a more technical
way, so as to appreciate the use of RTOS which also
gave the importance in the occurrence of interrupts as
well as its execution. This could also be extended to
the heavy vehicles, air bus, navigating vehicles, sense
detection machines. These are also extended to bio
medical fields, software development industries.
CONCLUSION :

20. FUTURE SCOPE
 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.

21. Thank you