This document describes an automatic engine locking system that detects alcohol levels in a vehicle. The system uses an Arduino, MQ3 alcohol sensor, relay, motor, and other components. It continuously monitors alcohol levels and will shut off the engine if levels exceed a threshold. The system aims to prevent drunk driving by automatically stopping vehicles operated by intoxicated drivers. It provides safety benefits and can help authorities enforce laws against drunk driving. The document outlines the components, working, advantages and applications of the automatic alcohol detection and engine locking system.

1. DEPARTMENT OF ELECTRONICS AND COMMUNICATION ENGINEERING
ADITYA INSTITUTE OF TECHNOLOGY AND MANAGEMENT
(Approved by AICTE,permanently affiliated to jntuk,kakinada)
(AUTONOMOUS)
k.kotturu,Tekkali-532201

2. AUTOMATIC ENGINE LOCKING SYSTEM
THROUGH ALCOHOL DETECTION
Project Guide Project Batch
Dr.P.Sirish kumar
G.Gouthami(19A51A04F0)
M.Tech Ph.d
T.Janaki(19A51A04I7)
Dept. of E.C.E
K.Abhishek(19A51A04G3)
AITAM
Ch.Madhu(19A51A04E0)
BATCH-C3

3. ABSTARCT
 "Drink not to drive, drive not to drink" although the words are plausible, how many people will
do it? Drinking and driving bring road traffic hidden danger to others and affect the safety of
their own life. So here we propose an innovative system to eliminate such cases.In another case,
if the driver is not drunk while he starts the vehicle and the engine is started, but they drink
while driving, the sensor still detects alcohol in his breath and stops the engine so that the car
would not accelerate any further and driver can steer it to the roadside. Aimed at the serious
Phenomenon of drunk driving in modern society, a Node MCU electronic circuit board is used in
the system. With alcohol sensor MQ303A, the alcohol concentration is detected. The system will
continuously monitor the level of alcohol concentration in the alcohol detection sensor and thus
turn off the engine of the vehicle if the alcohol concentration is above the threshold level.

4. INTRODUCTION
 The enormity of the dangerous driving transcends boundary. The laws in India are currently
prohibiting drivers to drink and drive so that the fine can stop them to drink and drive. Whatsoever,
effective observation of inebriated drivers could be a challenge to the policemen and road safety
officers. There is therefore the need for an alcohol detection system that can function without the
restriction of space and time.
 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.
 In this project, we are developing an Auto Lock System. Alcohol sensor is interfaced to
microcontroller. While alcohol wafers smelled by the sensor. Sensor sends the input voltage to micro
controller. 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.

5. LITERATURE SURVEY
 In this project a siren is being used which is highly economical, and can keep people in close
proximity vigilant.
 Microcontrollers are software based mega system in comparison to the economical siren that
are open source hardware.
 To prevent the mishap of drunken driving writer have used PIC16F877A microcontroller
which is an outdated system and expensive one also which restrains its use to only certain
class of society whereas we are using Arduino and Uno microcontroller which is advanced as
well as economical.
 MQ2 alcohol sensor is not authentic and raises the chance of false alarm while we have used
MQ3 which is highly authentic.

6. COMPONENTS USED
 Arduino UNO
 MQ3 Alcohol sensor
 5v relay
 Bo motar
 BC547 transistor
 220 ohm resistors
 9v batteries and caps
 LED
 Buzzer
 Mini bread-board
Required Tools:
 Glue gun
 Soldering Iron
 Wooden Board

7. ABOUT COMPONENTS
Arduino UNO:
R3Arduino Uno is micro-controller development board that works on Atmega-328P. The Arduino
results to numerous various functions like Microcontroller area unit, computer circuit unit, primarily
little computers that will run tiny easy software package programs, the area unit are enough low
steam-powered which can steam powered by various batteries for years however area unit ready to
measure information much quicker than a persons brain can method/suppose.
Power supply pins
Vin: the input voltage to the Arduino board is used as an external power supply (it is opposed to 5
volts from USB connection or other regulated power supply). you can supply voltage though this pin
or if supplying voltage via the power jack, access it through this pin.
5v: this pin outputs a regulated 5v from the regulator on the board. The board can be supplied power
either from the DC power jack(7-20v), the USB connector (5v) or the Vin pin of the board(7-20v).

8. 3.3v: A 3.3 volts supply generated by the on-board regulator.
GND: ground pins
IOREF: This pin on the Arduino/Genuino board provides the voltage reference with which the
microcontroller operates.
Reset: Typically used to add a reset button to shields that block the one on the board.

9. MQ3 Sensor
The MQ3 alcohol gas sensor is a module used for detecting alcohol, CH4, benzene, gasoline, hexane, CO,
and LPG. It has a sensitive material SnO2 for alcohol gas detection, with lower electrical conductivity in the
fresh air. It is a semiconductor alcohol gas sensor that detects or monitors the presence or absence of alcohol.
It is also known as chemiresistors because sensing of the sensitive material depends on the resistance change
when the sensor is exposed to alcohol gas. When the sensor is pointed closer to the alcohol gas, the SnO2
conductivity increases. The increase in sensor conductivity is directly proportional to the alcohol
concentration. Therefore, the alcohol concentration is measured by any microcontroller very easily. The MQ3
alcohol gas sensor is 18 very fast and has a high sensitivity to alcohol, smoke, and gasoline. An Alcohol
detector can be made using this alcohol sensor.
The concentration of alcohol gas sensing range in fresh air or atmosphere by the MQ3 sensor is 0.04mg/L-4
mg/L, which is acceptable for breath analysers. It consumes 150 mA and operates with a 5V power supply at
-10°C to 50°C temperature. MQ3 is a heater-driven sensor. That’s why it is enclosed in two layers of fine
stainless steel mesh called an Anti-explosion network. It ensures that the heater element inside the sensor will
not cause an explosion, as we are sensing flammable gas (alcohol).

10. Pin Out
VCC – Input Power Supply
DO – Digital Output
AO – Analog Output
GND – Supply Ground
Features of MQ3- Alcohol Gas Sensor
 Operating Voltage: 5V ± 0.1
 Concentration: 0.05 mg/L ~ 10 mg/L Alcohol
 Current Consumption: 150mA
 Output sensitivity adjustable
 Analog output 0V to 5V and Digital output 0V or 5V
 Low Cost and Fast Response
 Stable and Long Life
 Fair Sensitivity to Alcohol Gas
 Both Digital and Analog Outputs

11. LED:
An LED is a semiconductor light source which discharges centrality and
oozes light the degree that photons when electrons join with electron
openings. The shade of the light (standing out from the centrality of the
photons) is compelled by the vitality required for electrons to cross the vitality
band hole of the semiconductor and reach to conduction bands from the valence bands thus
penetrating through energy gap.
The alarm unit used is a buzzer which indicates when alcohol is detected. The buzzer is
activated when an oscillating signal is passed through the coil of the buzzer and it
fluctuates the disk present in the buzzer at a particular frequency which is equal to the
driving signal. The buzzer indicates that vehicle in front of us is unsafe.

12. Relay:
A 5v relay is an automatic switch that is commonly used in an automatic control circuit and
to control a high-current using a low-current signal. The input voltage of the relay signal
ranges from 0 to 5V.

13. Pin configuration:
 Pin1 (End 1): It is used to activate the relay; usually this pin one end is connected to 5Volts
whereas another end is connected to the ground.
 Pin2 (End 2): This pin is used to activate the Relay.
 Pin3 (Common (COM)): This pin is connected to the main terminal of the Load to make it
active.
 Pin4 (Normally Closed (NC)): This second terminal of the load is connected to either NC/ NO
pins. If this pin is connected to the load then it will be ON before the switch.
 Pin5 (Normally Open (NO)): If the second terminal of the load is allied to the NO pin, then the
load will be turned off before the switch.

14. WORKING
 MQ-3 sensor detects the presence of alcohol in the surroundings.
 The sensor provides output on the basis of the concentration of the alcohol.
 If the alcohol concentration is higher the conductivity of MQ-3 sensor increases which in
turn gives the reading to ARDUINO.
 If the reading is greater than the threshold level, ARDUINO will stop the DC motor.
 The red LED will also blink if the distance is less than the safe distance to give indication
to other vehicles that the vehicle in front of them is unsafe.

15. Microcontroller
Relay
DC Motor
Alcohol
Sensor
Block Diagram
LED&
Buzzer
Power
Supply

16. Circuit Diagram

17. Result

18. Arduino Software code
#define sensorDigital A0
#define Motor 9
#define buzzer 8
void setup() {
pinMode(sensorDigital, INPUT);
pinMode(Motor, OUTPUT);
pinMode(buzzer, OUTPUT);
Serial.begin(9600);
}
void loop() {
bool digital = digitalRead(sensorDigital);

19. Serial. Print("t");
Serial.print("Digital value :");
Serial.println(digital);
if (digital == 0) {
digitalWrite(Motor, LOW);
digitalWrite(buzzer, HIGH);
} else {
digitalWrite(Motor, HIGH);
digitalWrite(buzzer, LOW);
}
}

20. Advantages
 The Alcohol detection with engine locking system can be implemented in any 4- wheelers.
 It can help prevent accidents due to drunk driving.
 The Alcohol detection with engine locking system can be very helpful for police.
 It prove automatic safety system for cars and other vehicles.
Applications
 “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.

21. CONCLUSION
 We have given an incredibly capable way to deal and to develop a smart system for vehicles to
diminish number of disasters caused in light of alcoholic driving. As the creating insight
among people is that vehicle security is dynamically critical.
 Future degree of this structure is to control the setbacks caused due to alcohol use. This
system improves the security of individual and in this manner giving the convincing
progression in the vehicle business regarding decrease setbacks caused in light of driving.
Future scope
 We can implement GPS technology to find the location of the vehicle.
 If the sensor detects alcohol automatically it will send a text message to the nearby police
station, and to our family members.
 We can implement heart rate pulse variability to accurately identify the driving behaviour of
drivers and to assist them.
 Voice feedback can be used in the GPS module.

22. REFERENCES
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Geneva, Switzerland: World Health Organization.
2. Lee, Assessing the Feasibility of Vehicle-Based Sensors To Detect Alcohol Impairment. 2010, National
Highway Traffic Safety Administration: Washington, DC.
3. http://www.arduino.cc/
4. A. ISuge, H.Takigawa, H.Osuga, H.Soma, K.Morisaki, Accident Vehicle Automatic Detection System By
Image Processing Technology , ©IEEE 1994 Vehiclee Navigation & ISC.
5. Paul Baskett , Yi Shang , Michael V. Patterson , Timothy Trull , Towards A System for Body-Area Sensing
and Detection of Alcohol Craving and Mood Dvsregulation , © 2013 IEEE
6. Seniors
7. Cahalan,D., I. Cisin, and Crossley, American Drinking Practices: A National Study of Driving Behaviour and
Attitudes. 1969, Rutgers University Press: New Brunswick, NJ.
8. MUGILA.G, MUTHULAKSHMI.M, SANTHIYA.K, Prof.DHIVYA.P- SMART HELMET SYSTEM
USING ALCOHOL DETECTION FOR VEHICLE PROTECTION[International Journal of Innovative
Research in Science Engineering and Technology (IJIRTSE) ISSN: 2395-5619, Volume 2, Issue 7. July 2016].

23. THANK YOU
STAY SAFE