The document details the development of an automatic engine locking system aimed at preventing drunk driving, utilizing alcohol sensors interfaced with an AT89S52 microcontroller. The system detects alcohol levels in the driver's breath, locks the engine if alcohol is detected above a preset limit, and sounds a buzzer to alert the driver. It includes various hardware components and software tools for programming and circuit design, and provides supplementary project materials on CD/DVD.

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AUTOMATIC ENGINE LOCKING
SYSTEM FOR DRUNK AND DRIVER
ABSTRACT
AIM:
The main objective of this project is to develop an embedded system which
detects the alcohol. This project is implemented AT89S52 developed board interfaced
with alcohol sensor, Buzzer.
YOUTUBE VIDEO LINK
https://www.youtube.com/watch?v=y62puxoWMK8
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Alcohol sensorAlcohol sensor
MICROCONTROLLER
AT89S52
MICROCONTROLLER
AT89S52
BuzzerBuzzer
CrystalCrystal
Power
supply
Power
supply
LCDLCD
Engine/motorEngine/motor

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POWER SUPPLY:
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Step Down
Transformer
Bridge
Rectifier
Filter
Circuit Regulator
section

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DESCRIPTION:
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 main purpose behind this project is “Drunk driving detection”. Now a days, many
accidents are happening because of the alcohol consumption of the driver or the person
who is driving the vehicle. Thus Drunk driving is a major reason of accidents in almost
all countries all over the world. Alcohol Detector in Car project is designed for the safety
of the people seating inside the car. This project should be fitted / installed inside the
vehicle.In this project, we are developing an Auto Lock System. Alcohol sensor will be
attached with our microcontroller. While alcohol wafers smelled by the sensor. Sensor
sends the input voltage to microcontroller. If there are any traces of Alcohol above the set
limit, then the system will lock the Engine at the same time will automatically gives a
buzzer We can avoid accidents by checking the driving people on the roads. So that we
can avoid accidents.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
SOFTWARE:
1. Embedded C programming.
2. Keil software
3. Express SCH for Circuit design.
4. Proteus for hardware simulation.
5. ISP to burn the chip
HARDWARE:
1. Power Supply
2. Alcohol sensor
3. Buzzer
4. AT89S52
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5. Driver circuit
6. Engine/MOTORS
7. LCD
8. Lm324 op-amp
We will be providing the following details on CD / DVD
1. Abstract
2. Datasheets
3. Project Report in PDF format and in doc (word) format
4. Circuit diagram
5. PCB layout
6. Microcontroller program (software code) —–Embedded c code
7. Sample power point presentation.
8. HEX file of the microcontroller code
9. DATASHEETS of all the components / ICs used in the project
10. Photos & video file on entire project
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