Lesson 2

Arduino based gas leak detection system with GSM alert transmission.

First check you have the Arduino IDE installed, if not installed install 

You can find a video tutorial on installing the Arduino IDE at  this link.

Then we have to install the LiquidCrystal_I2C library.

To download this library follow the link  LCD I2C library

You can find a video tutorial on installing the library at this link.

Now that we have installed everything we need, let’s start creating our device. 

Step 1. Connect the display to the arduino 

Below is a diagram of connecting an LCD display to an arduino

 Step 2. Now we display the inscription Hello World on the display screen

After installing the library, open the Arduino IDE and run this sketch

#include <LiquidCrystal_I2C.h> // подключаем библиотеку

#include <Wire.h>

LiquidCrystal_I2C lcd(0x27,16,2);

void setup(){

  lcd.init();

  lcd.backlight();

  lcd.setCursor(0,0);

  lcd.print(“Hello World!”);

}

void loop() {

}

Step 3. Now we must connect the gas sensor to the arduino and display the problem on the screen 

To do this, we connect the arduino, display, sensor to the circuit board as shown in the figure below.

Then we run this sketch.

#include <LiquidCrystal_I2C.h>

#include <Wire.h>

#define analogsignal A0

int gas = 0;

LiquidCrystal_I2C lcd(0x27,16,2);

void setup(){

  lcd.init();

  lcd.backlight();

}

void loop() {

  lcd.clear();

  gas = analogRead(analogsignal);

  lcd.setCursor(0,0);

  lcd.print(“Gas=”);

  lcd.setCursor(4,0);

  lcd.print(gas);

  delay(500);

}

Step 4. We connect the LEDs and a buzzer for alarms if the gas level exceeds the value we specified

Run this sketch

#include <LiquidCrystal_I2C.h>

#include <Wire.h>

#include <SoftwareSerial.h>

LiquidCrystal_I2C lcd(0x27,16,2);

#define analogsignal A0

int gas = 0;

void setup(){

  lcd.init();

  lcd.backlight();

  pinMode(3,OUTPUT);

  pinMode(4,OUTPUT);

  pinMode(5,OUTPUT);

  }

void loop(){

  lcd.clear();

  gas = analogRead(analogsignal);

  lcd.setCursor(0,0);

  lcd.print(“Gas=”);

  lcd.setCursor(4,0);

  lcd.print(gas);

  if(gas>300){

    digitalWrite(3,HIGH);

    digitalWrite(4,LOW);

    digitalWrite(5,HIGH);

    }

   else{

    digitalWrite(3,LOW);

    digitalWrite(4,HIGH);

    digitalWrite(5,LOW);

    }

  delay(1000);

}

Step 5. We connect to our scheme GSM SIM900

We connect the GSM module as shown in the figure below

Conclusion

In the event of a gas leak, the buzzer starts to sound an alarm, the red LED lights up, and the gas level value is displayed on the LCD, and an SMS is sent to the user to warn of the leak.