Breathalyzer Circuit Tutorial: Alcohol Detection with Arduino and Gas Sensor

Breathalyzer circuit tutorial for beginners

Overview

This project measures the amount of alcohol consumed by any person. Using the gas sensor, the LED will show an alert or normal to the breath, basically it analyses the human breath and tells the amount of alcohol consumption.

In this breathalyser, the gas sensor calculates the amount of alcohol and will print the results on the LCD, and if the amount of alcohol is greater than normal, the red LED will glow.

Hardware required 

1. Arduino Uno R3
2. LED
3. Resistor
4. Jumper Wires
5. Gas Sensor
6. Buzzer
7. LCD
8. Potentiometer

Schematic Diagram

Arduino Code : 

#include <LiquidCrystal.h>

LiquidCrystal lcd(12 ,11 ,5 ,4 ,3 ,2);

int ledPin = 10;

int sensorPin = A0;

int value;

void setup()

{

  Serial.begin(9600);

  lcd.begin(16,2);

  pinMode(ledPin,OUTPUT);

}

void loop()

{

  int value = analogRead(sensorPin);

  value = analogRead(A0);

  lcd.print("Alcohol Level :");

  lcd.print(value-50);

  Serial.print(value);

  if (value-50 > 400)

  {

    digitalWrite(ledPin,HIGH);

    lcd.setCursor(0,2);

    lcd.print("Alert....!!!!");

  }

  else {

    digitalWrite(ledPin,HIGH);

    lcd.setCursor(0, 2);

    lcd.print("...Normal...");

  }

delay(500);

lcd.clear();

}

Precautions

1. Connections should be done properly.
2. Arduino is case Sensitive, so code accordingly.
3. Give different and appropriate colours to the wires.
4. Use resistors for sensors and LEDs.

In conclusion, building a breathalyser circuit is an exciting way to learn about electronics, sensors, and coding. Projects like these not only enhance practical skills but also encourage problem-solving and logical thinking. By experimenting with Arduino, LEDs, buzzers, and gas sensors, beginners gain hands-on experience that strengthens their understanding of both hardware and software integration.

For kids and enthusiasts eager to explore more coding and electronics projects, coding schools provide structured programs and guidance. Start your journey today and turn curiosity into real-world skills through engaging, educational projects.