Gas Sensor Using Arduino

How to Make an LPG leak detector with Arduino

We pass our day-to-day life with fun and joy. We use IOTs, Cloud Network, Computers as an aid to decrease work stress or for security. Still the truth is IOT or any other advanced technology is not available every where in this world.

My aim through this project is to give security to all the people around the world from lpg gas leak. We can prevent it from happening with the expenditure of few dollars.

In this work I will be using one gas sensor and two indicator led and a buzzer and we are using general arduino micro-controller.

Step 1: Get the components

1. Arduino Uno / Genuino uno board

https://www.sunfounder.com/genuino-uno-rev3-control-board.html

2. USB cable

3. Buzzer

https://www.amazon.com/Goliton-High-decibel-Electronic-Continuous-Arduino/dp/B01MT5V0FM/ref=sr_1_2?s=electronics&ie=UTF8&qid=1501340858&sr=1-2&keywords=buzzer

4. red and green leds

5. Breadboard

6. MQ5-LPG or gas sensor

https://www.amazon.com/WINGONEER-Combustible-Propane-Butane-/Detector/dp/B06XHKPV2Q/ref=sr_1_2?s=electronics&ie=UTF8&qid=1501340934&sr=1-2&keywords=mq+5

7. Jumper wires

Step 1: ​ Connections

Connections to this project is very simple just follow the table given below

The MQ-5 sensor has 4 pins.

Pin-------------------------------------Wiring to Arduino Uno

A0-------------------------------------Analog pins

D0-------------------------------------none

GND-----------------------------------GND

VCC------------------------------------5V

And for other components

Pin-------------------------------------Wiring to Arduino Uno

D13------------------------------------- +ve of buzzer

GND------------------------------------- -ve of buzzer

D12------------------------------------- anode of red light

D11------------------------------------- anode of green light

GND------------------------------------- cathode of red light

GND------------------------------------- cathode of red light

In the end, connect the UNO board to the computer with a usb cable.

Step 2: Code

Open Arduino IDE, write the code

code

/*******************************************************************************

DESIGNER : ADARSH C

DATE :12/8/17

WORK : GAS SENSOR

*******************************************************************************/

int red_led=12;

int green_led=11;

int buzz=13;

int gas_value;

int gas_avalue;

int sensorThres=400;

void setup()

{

pinMode(red_led,OUTPUT);

pinMode(buzz,OUTPUT);

pinMode(green_led,OUTPUT);

pinMode(A1,INPUT);

Serial.begin(9600);

}

void loop()

{

gas_avalue=analogRead(A0);

if (A0 > sensorThres)

{

digitalWrite(red_led, HIGH);

digitalWrite(green_led, LOW);

digitalWrite( buzz, HIGH);

Serial.println(“DANGER!!!!”);

Serial.println(gas_avalue);

}

else

{

digitalWrite(red_led, LOW);

digitalWrite(green_led, HIGH);

digitalWrite( buzz, LOW);

Serial.println(“NO LEAKAGE”);

Serial.println(gas_avalue);

}

delay(100);

}

Step 3: NOTE :-

1. Select the board you are using in

Tools --> Board

otherwise it will give you an error while dumping the code

2. sometimes even selected com port will be diffrent so go to

Tools --> Port

and set the com port which you have connected the board

3. Sometimes sensor won't give a perfect value try changing gas threshold value in the program

4.If you are testing with lighter the amount of BUTANE produced is very less so it might take 2 or 3 seconds to detect

Step 4: OUTPUT

OUTPUT

In the presence of LPG (BUTANE) it will glow red and buzzer will turn on

In the absence of LPG (BUTANE) it will glow green