Alcohol Detection Kit />

Alcohol Detection and Safety Monitoring System Using Arduino

By Shail Pathak

Introduction:

Drunk driving is a major cause of accidents worldwide. This project presents an Alcohol Detection and Safety Monitoring System using Arduino Uno, an MQ-3 Alcohol Sensor, a Buzzer, and an LCD Display.

It detects alcohol levels in a person's breath and alerts immediately if alcohol is detected.

Why Build an Alcohol Detection System?

Preventing drunk driving can save countless lives. This system can be used in vehicles, public transport, or even educational projects. It’s affordable, practical, and enhances awareness about road safety.

Components Required:

Circuit Connections:

Component Pin (Arduino) Pin (Component)
MQ-3 Sensor 5V VCC
MQ-3 Sensor GND GND
MQ-3 Sensor A0 AOUT
MQ-3 Sensor Not Connected DOUT
Buzzer D3 Signal / IN
Buzzer 5V VCC
Buzzer GND GND
LCD Display (I2C) A4 SDA
LCD Display (I2C) A5 SCL
LCD Display (I2C) 5V VCC
LCD Display (I2C) GND GND

Libraries Required:

  • LiquidCrystal_I2C Library

Steps to Install:

  1. Open Arduino IDE
  2. Go to Sketch → Include Library → Manage Libraries
  3. Search for "LiquidCrystal_I2C" by Frank de Brabander or similar
  4. Click Install

Alternatively, download from: LiquidCrystal_I2C GitHub .

Arduino Code:

#include <Wire.h>
#include <LiquidCrystal_I2C.h>

#define alcoholSensorPin A0
#define buzzerPin 3

LiquidCrystal_I2C lcd(0x27, 16, 2);

void setup() {
  pinMode(buzzerPin, OUTPUT);
  lcd.begin();
  lcd.backlight();
  Serial.begin(9600);

  lcd.setCursor(0, 0);
  lcd.print(" Breathalyzer ");
  lcd.setCursor(0, 1);
  lcd.print("Initializing...");
  delay(2000);
  lcd.clear();
}

void loop() {
  int alcoholLevel = analogRead(alcoholSensorPin);
  Serial.println(alcoholLevel);

  if (alcoholLevel > 400) {
    digitalWrite(buzzerPin, HIGH);
    lcd.setCursor(0, 0);
    lcd.print(" WARNING! ");
    lcd.setCursor(0, 1);
    lcd.print("Alcohol Detected");
  } else {
    digitalWrite(buzzerPin, LOW);
    lcd.setCursor(0, 0);
    lcd.print(" Status: OK ");
    lcd.setCursor(0, 1);
    lcd.print("No Alcohol Found");
  }
  delay(500);
}

Working Principle:

  • The MQ-3 sensor continuously monitors breath alcohol concentration.
  • When alcohol concentration crosses the safe limit:
    • The sensor output analog value increases.
    • Arduino triggers the buzzer.
    • LCD shows "Alcohol Detected".
    • The serial monitor logs the detection.
  • When no alcohol is detected:
    • The buzzer remains OFF.
    • LCD displays "Safe to Drive".

Applications:

  • Driver Breath Analysis Systems
  • Car Safety Systems
  • School or College Safety Projects
  • Public Transport Safety

Final Thoughts:

This Alcohol Detection System promotes road safety awareness and provides a base for building advanced solutions like automatic engine lock, SMS alerts, or GSM integration. Easy to build and very useful!

Output:

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