Published December 19, 2021 © MIT

Automatic Gas Reduction System

This is a project on automatic exhaust fan that can be triggered when gas level of a room will be increased.

IntermediateFull instructions provided2 hours1,469

Things used in this project

Hardware components

Arduino UNO

Seeed Studio Grove - Gas Sensor(MQ2)

Buzzer

DC Motor, Miniature

SparkFun Pushbutton switch 12mm

5 mm LED: Red

Adafruit Standard LCD - 16x2 White on Blue

Rotary potentiometer (generic)

Resistor 1k ohm

Resistor 330 ohm

Breadboard (generic)

Jumper wires (generic)

Software apps and online services

Arduino IDE

Story

Introduction

In this project I am going to demonstrate how we can eliminate gas from our kitchen or home using Arduino and Gas Sensor. Basically we are going to make an automatic gas reduction system.

We are using Tinkercad platform for this project. It will be a virtual project on Arduino.

Circuit Analysis

Gas Sensor & Arduino

B1, B2 and H2 will connect with the +5V of Arduino
H1 will connect to the GND
A2 connect to the Arduino Analog Pin A0
A1 will connect to the GND through a 1KΩ resistor

LCD Display with Arduino

GND Pin to Arduino GND
Vcc Pin to Arduino +5V pin
V0 to Pot Wiper Pin(Middle Pin)
Rs to Digital Pin 6
RW to GND
E(enable) Pin to Digital Pin 7
DB4 to Digital Pin 8
DB5 to Digital Pin 9
DB6 to Digital Pin 10
DB7 to Digital Pin 11
LED to 1kΩ to +5V
Led Cathode to GND

Dc Motor(Fan) to Arduino

Terminal 1 to GND
Terminal 2 to Arduino Digital Pin 5

Push Button to Arduino

Terminal 2a to Arduino Digital Pin 3
Terminal 2a to 330Ω resistor to GND
Terminal 1b to +5V

Buzzer to Arduino

Positive Pin to Arduino Digital Pin 4
Negative Pin to Arduino GND

LED to Arduino

Anode to Arduino Digital Pin 2
Cathode to Arduino GND

Working Principle

In this project our central component is Arduino UNO. Arduino will make decision when the gas amount is more than the threshold value, an automatic fan will ON and deduct the extra gas from the room or kitchen.

Here, we have a gas sensor that will connect with the Arduino. The gas sensor will read the gas amount from the air. Then we have to set a gas threshold value. When the gas value of the air of our home or kitchen is more than the threshold value. The exhaust fan will automatically ON. After eliminating the gas amount from the air the exhaust fan will automatically OFF.

Let's say the gas threshold value is 300. Now, the gas sensor currently read the gas value from the air is 280. In this matter the exhaust fan will be OFF by default. Now consider another scenario, In this time threshold value is 300 and the gas sensor value is 310. In this case the exhaust fan will be ON after exceeding the threshold value of the gas. When the exhaust fan is ON the Red LED and Buzzer will be on simultaneously. It indicates the gas value of the room is high. We can monitor this gas data through the LCD Display.

Additionally we have an extra feature in this project. If we need to ON the exhaust fan manually, we can also do that by pressing the Push Button. After the pressing the Push Button, the exhaust fan will be ON for 10 seconds. This delay time may vary according to our code.

Procedure

Step-1

Login to the Tinkercad platform. If you have not an account in Tinkercad, first create an account. It is completely free.

Official Link of Tinkercad: https://www.tinkercad.com/

Step-2

Now create a new project in the section of circuit of Tinkercad.

Step-3

In the workspace drag and drop your required components and build up the circuit.

Step-4

Now write the code according to the Code section.

Step-5

It's time to test your circuit. For testing the project you need to hit the Start Simulation button.

Demonstration Video

Links

Tinkercad Project Link: https://www.tinkercad.com/things/29Eb3kuvlnO

Code

Automatic Gas Reduction System

#include <LiquidCrystal.h>

LiquidCrystal lcd(6, 7, 8, 9, 10, 11);
float gasPin = A0;
float gasLevel;
int ledPin = 2;
int buttonPin = 3;
int buzzPin = 4;
int buttonState;
int fan = 5;

void setup(){
  pinMode(ledPin, OUTPUT);
  pinMode(buttonPin, INPUT);
  pinMode(gasPin,INPUT);
  pinMode(fan,OUTPUT);
  Serial.begin(9600);
  lcd.begin(16, 2);
  lcd.setCursor(0,0);
  lcd.print("   Welcome");
  lcd.setCursor(0,2);
  lcd.print("   Youtube");
  delay(500);
  lcd.clear();
}

void loop(){
  // Read the value from gas sensor and button
  gasLevel = analogRead(gasPin);
  buttonState = digitalRead(buttonPin);
  
  // call the function for gas detection and button work
  gasDetected(gasLevel);
  exhaustFanOn(buttonState);
}

// Gas Leakage Detection & Automatic Alarm and Fan ON
void gasDetected(float gasLevel){
  if(gasLevel >= 300){
  	digitalWrite(buzzPin,HIGH);
    digitalWrite(ledPin,HIGH);
    digitalWrite(fan,HIGH);
    lcd.setCursor(0,0);
  	lcd.print("GAS:");
    lcd.print(gasLevel);
  	lcd.setCursor(0,2);
  	lcd.print("FAN ON");
  	delay(1000);
  	lcd.clear();
  }else{
  	digitalWrite(ledPin,LOW);
    digitalWrite(buzzPin,LOW);
    digitalWrite(fan,LOW);
    lcd.setCursor(0,0);
  	lcd.print("GAS:");
    lcd.print(gasLevel);
  	lcd.setCursor(0,2);
  	lcd.print("FAN OFF");
  	delay(1000);
  	lcd.clear();
  }
}

// Manually Exhaust FAN ON
void exhaustFanOn(int buttonState){
  if(buttonState == HIGH){
    digitalWrite(fan,HIGH);
    lcd.setCursor(0,0);
  	lcd.print("Button State:");
    lcd.print(buttonState);
    lcd.setCursor(0,2);
    lcd.print("FAN ON");
    delay(10000);
    lcd.clear();
  }
}

Credits

Khaled Md Saifullah

18 projects • 44 followers

🦸Tech Enthusiast 👨🏾‍💻Programmer 📳IoT Specialist