How to interface MQ-2 Gas Sensor with Arduino Uno (with Code and Library)

#Arduino​ #Smoke​ #Detector​
What is a Gas Sensor?
They are electronic devices that detect and identify different types of gasses. They are commonly used to detect toxic or explosive gasses and measure gas concentration.
In this project, I have interfaced a Gas Sensor with Arduino that displays the contents of various gases in the atmosphere. The MQ-2 Gas Sensor can detect a list of Gases along with Smoke.
So incase you are looking out for a smoke detector, you can modify the same program for smoke detection.
Components List:
Arduino Uno : amzn.to/3eAvyJl
MQ-2 Gas Sensor : amzn.to/3nbnKl8
LCD 16x2 with I2C Module : amzn.to/3sByuKE
Jumper Cables : amzn.to/3v3juGM
MQ-2 Sensor Code and Libraries :
github.com/rol...
Library
www.electronic...
Code : www.electronic...
LCD tutorial : • LCD 16x2 interfaced wi...
Read the Post at : www.electronicssimplified.in
Background Music
Lichu - Island
• Lichu - Island
Please show some love.
Like | Share | Subscribe
#GasSensor​​ #Arduino​#SmokeDetector​#Gases​

[@shramiksalgaonkar8635]

One of the most detailed video on youtube. Great work sir...

[@denzilpillay7986]

I am using this video as part of my project and when you listed all the materials I bought them , you mentioned that we should but Male to Female but went on to use Male to Male.

[@rolanpereira7643]

Female to male is preferably. But a jumper cable set is what is mentioned in the video.

[@ElectronicsSimplified7]

Jumper cable set is listed in the components. Please use the links below. If you have existing jumper cables then male to female are preferred as they would replace the use of even a breadboard.

[@satishmohitsatish1730]

Sir how to connect alarm in this project if lpg or another harmful gas leakage happened

[@bhaskarg8438]

Better if you also explain the code logic with respective to the components assembled to Arduino, Thank you

[@ElectronicsSimplified7]

I have started doing this in my newer videos. Considering your suggestion.

[@ELECTRICIAN228]

How to convert sensor output 4-20mA connect to the plc

[@TheIQ127]

can you please give me the vision of liquidi2c library please

[@ElectronicsSimplified7]

www.electronicssimplified.in/wp-content/uploads/2023/06/LiquidCrystal_I2C.zip

[@prashadnaik1208]

Well explained Sir

[@ElectronicsSimplified7]

Well more will keep coming ... ❤️

[@sagarnarote1045]

Sir I really need your help can I get your contact number

[@ElectronicsSimplified7]

[e-mail]

[@akshaypatil8467]

Can we used multiple gas detector sensor

[@david-tracy]

Great work bro

[@arunkarthik2961]

nandri nanbare 🥺🙏🙏

[@ayushtiwari46]

Bro I want to add gsm module in it also how may I do that ????????........plz reply

[@nsagrawal5444]

Can you siplyfy the wire connection

[@kushals2538]

i have given the correct commands and connections but the lcd is not powering up

[@muhammadnawzad1680]

Hi i have some question 1- for the measurement how to calibrate it ? 2- what is the range that read for LPG in PPM ? Maximum & Minimum?

[@shashanktg08]

i did the same way as shown it turned on as it was to be but there is no reading on the lcd what is the problem

[@2JSinc]

Thanks for this, would it be possible for you to add a LPG tank weight monitoring with low level alert, thanks

[@ElectronicsSimplified7]

U need to use fuel level meter ...

[@RajaboinaPoojitha]

needed circuit diagram also plz upload

[@nauvalalzidane8235]

can it detect motorcycle/car exhaust gas? can i put it outside?

[@ElectronicsSimplified7]

It will work.. you will have to take care of the wiring.

[@mariyamansari5526]

Sir i am getting the output on serial monitor but not on LCD

[@ElectronicsSimplified7]

Can you check your connections?

[@ElectronicsSimplified7]

Make sure your libraries for LCD are added correctly. Please add the libraries from the description.

[@johnpatrickabsalon2221]

what type of Arduino is this? can i use arduino uno r3 DIP?

[@sriyakanuri4453]

Hi, i've the lcd but do not have the i2c coverter, so how do i interface it?

[@sriyakanuri4453]

Can I still use an lcd shield instead?

[@MuhammadSyamil-me8vw]

bro in the library there is only lpg,co,and smoke, how do i detect the ch4 then?

[@manojmodapalli1635]

sir i did the same connection shown in the viedo , lcd display was working but it didnt show the detection percentage as shown in the viedo how can i fix this problem , thank you

[@ElectronicsSimplified7]

You can check for your wires and connections

[@erasaniswaroopkumar9124]

can u explain the mq7,and mq8 gas sensors interface with arduino uno output data displays in 20*4 display with code

[@trinican2]

I enjoyed your tutorial but I have two questions. 1. Does the MQ2 library automatically includes the calibration in gas type and ppm ? 2. I would like to do the same with an MQ9 to measure natural gas in ppm. Is there an equivalent MQ9 library and would the command syntax be the same ? Thanks very much.

[@ElectronicsSimplified7]

1.The library of MQ2 includes the calibration for all the gases MQ2 sensor can detect. 2. github.com/mdsiraj1992/Gassensors visit this link and access all the libraries for MQ gas sensors. Thank you!

[@kagisopilane1000]

Hi, this is great. My LCd displays lpg: 0 CO:0 Smoke: 0%. Is the problem with the calibration maybe

[@Drxxx]

Great channel!!

[@ElectronicsSimplified7]

Thank you!

[@sanjaykhatri6093]

My code is loaded sucessfully but all the values are showing 0 then what to does we have to wait for 5 minutes for heating and even after bringing the smoke near the mq2 sensor there is no reading on LCD

[@ElectronicsSimplified7]

Sensor is not connected correctly

[@khessclarksereno6327]

Is it possible to measure the level of methane gas only in the mq2 library?

[@RitheshMoolya]

I need ammonia sensor with display...

[@AnshumanAtrey]

will it work directly with a laptop and no battery? my LCD only shows blue light I am using 400 point breadboard The I2C module is already connected to LCD please help sir

[@bhuvaneswarporandla]

If lcd only shows blue screen that means potentiometer in l2C module is low

[@bhuvaneswarporandla]

Try changing it I think this reply is bit late 😅

[@poornahs-n8o]

bro can we use c2h4 gas sensor fof same steps behalf of using gas sensor

[@ElectronicsSimplified7]

No

[@dr.mithilfaldesai3561]

What is the output unit from A0? resistance in milliohms? current in mA?

[@ElectronicsSimplified7]

It's neither. It will always be voltage levels. That would be ranging from 0V to Vcc (in this case its 0V to 5V)

[@azuraaishah61]

lcd.print((smoke*100)/1000000); what is the purpose of this formula?

[@manmangy]

Can we use this to test Chlorine

[@ShiwonPrecious]

Sir please which code did you use for the gas detector

[@ElectronicsSimplified7]

Code : www.electronicssimplified.in/feed/code-for-gas-sensor/

[@wanfiq3191]

can i get example the coding?

[@ElectronicsSimplified7]

Its in the description

[@ShiwonPrecious]

Is it possible to detect the gas and actually direct it in a particular place

[@ElectronicsSimplified7]

Could you please elaborate?

[@joycechong8907]

Well explanation!! Nice! I have a little question. Since most of the tutorials are used to test for smoke and gas, is that possible to test the human breathing? Thanks!

[@ElectronicsSimplified7]

No. This is not mean for human breathing.

[@joycechong8907]

@@ElectronicsSimplified7 Is there any sensor to test for?

[@ElectronicsSimplified7]

Wearable Humidity sensors.

[@AswiniS-t1q]

Why it is taking too long to upload the program into Arduino Uno?

[@ElectronicsSimplified7]

Sometimes the compilation can take longer than expected. It's completely normal.

[@Arman-v9f4i]

Broh! At 3:25 uh said to connect A0 to Analog Pin 0 on Arduino, but uh connected GND to A0 .Can uh plzz tell me which is correct??

[@rolanpereira7643]

Connect A0 to Analog Pin 0 on Arduino, that's correct.

[@rolanpereira7643]

Don't go by the wire colors. They are a little similar. And i see why you are confused.

[@ElectronicsSimplified7]

Please see that A0 on the MQ will be connected to A0 pin on the Arduino. Don't refer the wire colors. See the circuit diagrams. Bingo.

[@Arman-v9f4i]

@@ElectronicsSimplified7 Ok broh.. Thanks for helping. Im confused by colours.

[@Arman-v9f4i]

@@rolanpereira7643 Thanks broh!

[@ujjwalsinha7385]

the output is not displayed on the LCD what to do?

[@NBAK-jx5ud]

where's the link for the LCD not display.

[@ElectronicsSimplified7]

kzbin.info/www/bejne/i5bdoHaYd7iUrLM

[@NBAK-jx5ud]

oh wow! very responsive thank you!. hoping you gain million of subscribers! ❤️

[@gourabhaldar6627]

If I use MQ135 instead of MQ2 will the code change?

[@ElectronicsSimplified7]

Yes it will change

[@gourabhaldar6627]

@@ElectronicsSimplified7 ok sir, thanks for the reply. Actually I'm doing this with MQ135 sensor. So can you please tell what changes I need to do in order to run this successfully. Thanks in advance.

[@NotGreig]

hello sir, i am receiving a compiling error with my lcd screen. It say's no matching function

[@ElectronicsSimplified7]

Install the required libraries

[@carson5702]

loved the vid but where can you find the MQ2 sensor library normally because I can't find it.

[@ElectronicsSimplified7]

www.amazon.com/Butane-Hydrogen-Sensor-Detector-Module/dp/B0786DH3BW/ref=mp_s_a_1_2?keywords=mq2%2Bsensor&qid=1638064300&sr=8-2&th=1&psc=1

[@ElectronicsSimplified7]

github.com/rolan37/MQ-2-Sensor-Interfaced-with-Arduino

[@rafaelbendigo6270]

is it necessary to solder his 16pins to work?

[@ElectronicsSimplified7]

Necessary... If you do not want to solder... Then use a breadboard

[@rafaelbendigo6270]

@@ElectronicsSimplified7 can i pm you ? my lcd doesn't work like yours. the wires are the same how it is in the video.

[@rafaelbendigo6270]

@@ElectronicsSimplified7 i like your video and explanation but the only is not working is my LCD pls help .

[@ElectronicsSimplified7]

Visit electronicssimplified.in and contact me

[@deadlyvenom5804]

Dude smoke ppml is not calculating any solution??

[@dilj1439]

Where is the code .?.???

[@MariyamAnsari-m1v]

Sir i am getting the output displayed on serial monitor but not on lcd .There are no errors and connections are also proper

[@ElectronicsSimplified7]

Why is the LCD working with other programs? Just check if the LCD can receive data and display some data on it. You might have to adjust your potentiometer at the back of your I2C module.

[@boraicho6276]

Does this sensor (MQ-2) detect Carbon Dioxide concentration ? I only see Carbon Monoxide reading in the video.

[@ElectronicsSimplified7]

Yes

[@T-he_End]

lcd.begin();//Defining 16 columns and 2 rows of lcd display . Bro in this line i am getting error. Pls help me .its an emergency pls . I have school project

[@flemyjose4036]

why the analog output of sensor is being used instead of digital output

[@ElectronicsSimplified7]

Digital will just tell us if any particle is sensed or not sensed (0 and 1 - digital).

[@ElectronicsSimplified7]

We need to figure out what particle is sensed so we take the analog reading to decided what type of particle is being sensed.

[@ElectronicsSimplified7]

Particle ----> Gas (Thats the simplification). Thank you for your question!

[@AmanKumar-es4wp]

Sir I have urgent need of this program

[@edscelavancena2133]

how to connect alarm in this project if lpg or another harmful gas leakage happened

[@ElectronicsSimplified7]

Use a threshold value for detection and digital write the buzzer High...

[@edscelavancena2133]

@@ElectronicsSimplified7 thanks

[@edscelavancena2133]

@@ElectronicsSimplified7 can u teach me how? please

[@the_hyper_here3236]

sir can you send me working of block diagram

[@awiawi117]

i didn t understand the last step in in 9:18 how do it?

[@ElectronicsSimplified7]

You can just upload the code. By selecting your board.

[@awiawi117]

@@ElectronicsSimplified7 what board sorry i am a beginner can you explain a bit more i did everything like the vid i am just stuck at the last part and i need it for tomrow

[@ElectronicsSimplified7]

You can check some basic videos on how to upload code to Arduino Uno.

[@AmanKumar-es4wp]

If any one u have and you know how to program them plzz help

[@Amazon_offers2]

bro can you make this without i2c

[@karthik3889]

Please give mq 4 library

[@diabolsensei]

hi can i get ckt diagram for this project.

[@ElectronicsSimplified7]

github.com/rolan37/MQ-2-Sensor-Interfaced-with-Arduino

[@XyzSrivastava]

How i code into the laptop

[@kaushikmistry3438]

Bro mq2 library is not installing

[@ElectronicsSimplified7]

You have to remove it from your Arduino/library folder And then reinstall it.

[@_TranKhanhTruc]

you conect com 3 or 4 or 5 ?

[@ElectronicsSimplified7]

You can connect any com port. It is based on your computer where your Arduino is installed. You can go to device manager on your computer and check the universal serial Bus section

[@_TranKhanhTruc]

@@ElectronicsSimplified7 thank you, i got it. because my ardunio has problem so it doesn't show Com pin. I will change my Ardunio

[@ElectronicsSimplified7]

Mostly the arduinos don't blow up... Check your USB cable first. And then also check if the Arduino has any LED indicators ON. If yes, then you need to just change your data cable and not the whole Arduino.

[@loveislikedream]

bro i we do this project without 12 c module

[@ElectronicsSimplified7]

Possible

[@157vaibhavibhalerao5]

overall price ?

[@maanisaeed]

I am looking to someone to make me whole unit with my logo on it, with packing and detail instructions, how to install it . I need big production of it. Thanks

[@ElectronicsSimplified7]

For which place

[@nirajkalamkar3107]

I did the same process which you did but it didn't work the code failed in uploading i didn't changed the code even but still it failed i asked my uncle who is engineer he said this cannot be worked i tried for 4-5 times but it failed

[@ElectronicsSimplified7]

Check your USB cable. If it's faulty.

[@ElectronicsSimplified7]

Check your USB cable. If it's faulty.

[@Arman-v9f4i]

Broh! Can uh plzz give MQ5 library

[@ElectronicsSimplified7]

github.com/mdsiraj1992/Gassensors

[@nandagustiawan6237]

please library MQ4

[@razzheenshyrickadelacruz5233]

I tried doing this project. However, the smoke cannot be detected. The value displayed for smoke is at 0% only. Only the values of LPG and CO are read. How can I fix this?

[@thatwasparticia6671]

Help, what did you do

[@ElectronicsSimplified7]

You probably have changed the code and failed to display it.

[@bryanlanchimba4740]

​@@thatwasparticia6671 I think it is because we transformed the smoke reading into a percentage. The value is very small and could not be read. I removed this 100/1000000 part and started reading the smoke.

[@vidhyakoranga9067]

Sir please provide the ges sensor code.

[@ElectronicsSimplified7]

Code : www.electronicssimplified.in/feed/code-for-gas-sensor/

[@vidhyakoranga9067]

TQ sir

[@ElectronicsSimplified7]

The code was always available in the GitHub repo

[@shamilsalman9175]

add buzzer and gsm module to it

[@ElectronicsSimplified7]

Possible. You can mail me at [e-mail].

[@DavidDavis-se8ns]

His "MQ-2" sensor looks like an MQ-135. I know because I bought the same. Only in the Fritzing schematic, an MQ-2 is depicted. MQ-2 is not even suited for carbon dioxide but MQ-135, which he handles at the beginning (I quit watching) does.

[@ElectronicsSimplified7]

As an example, a methane (molecular) concentration of 2% means that 2 out of every 100 air molecules is methane. Similarly, a methane concentration of 2 ppm means that 2 out of every 1 million air molecules is methane. Can MQ-2 detect CO2? A short and simple answer to this question is yes, it can detect CO2. You can refer to how smoke is mostly a combination of carbon monoxide and carbon dioxide. Mq-2 sensor has the ability to detect. But the measurements are derived from other gas concentration values.

[@DavidDavis-se8ns]

@@ElectronicsSimplified7 You are quite right that there is a mathematical correlation between the two. It's just that we do not exhale methane. I believe cows do produce a lot of methane. So there could be one useful application for it 🙂. If you don't want to spend some 30 bucks on a real CO2 sensor you could get the SGP30 from Ali.... for a few dollars. It does a pretty good job in indirectly calculating the CO2 value in the air. Some smart folks on KZbin already found out. I probably will get one too, later on. ...

[@sakshisuvarna3902]

hello, is it okay to add MQ9 sensor instead of MQ2 and how about library ? thanks in advance

[@ElectronicsSimplified7]

No it's not okay ... They are two different sensors. They do almost the same job but have been built different over the years.

[@ElectronicsSimplified7]

You could download the MQ9 Sensor library from the internet

[@AmanKumar-es4wp]

Sir I am new student I don't know how to program so plzzz help

[@ElectronicsSimplified7]

The program is in the GitHub link please check

[@nagakowshik578]

sir can u plz help me connection of mu project sir my project is fire and gas detection system with IOT sir

[@ElectronicsSimplified7]

Sure ... Dm on Instagram electronics simplified

[@novestkuvimba1469]

Hie sir, can you sent us the code for the Arduino.

[@ElectronicsSimplified7]

github.com/rolan37/MQ-2-Sensor-Interfaced-with-Arduino

[@lydianandaputri1582]

mq-6??

[@patiencemtonhodza2477]

can l get the code for this project bro

[@ElectronicsSimplified7]

It's in the description

[@ElectronicsSimplified7]

github.com/rolan37/MQ-2-Sensor-Interfaced-with-Arduino

[@patiencemtonhodza2477]

@@ElectronicsSimplified7 i want to connect a buzzer or speaker and two LED

[@patiencemtonhodza2477]

@@ElectronicsSimplified7 CAN YOU HELP

[@ElectronicsSimplified7]

Can you email me at [e-mail]

[@AhsanAli-z6i]

Sir kindly code and library send kr dy

[@ElectronicsSimplified7]

Link to the code in the description

[@venkateshakula7373]

Bro can I have algorithm of this project tonight same project I have doing in my clg.if u interest to help comment your any social media accounts

[@karthik-gz3oz]

bro i want zip files

[@dextrond.5557]

Mq2 sensor can’t differentiate gasses,

[@ElectronicsSimplified7]

It can detect all those gases. But it can't find out which gas was detected particularly. But by concentration. It can be predicted. So in a LPG prone leakage zone. You can set the value. That's the whole purpose.

[@venkateshakula7373]

Vision of arduino pls bro it's an urgent

[@ElectronicsSimplified7]

kzbin.info/www/bejne/eaO5oGCfeMqNas0

[@satishmohitsatish1730]

Led have no lights

[@ElectronicsSimplified7]

Can you please elaborate?

[@lil_tesla_69]

@@ElectronicsSimplified7 hello sir I don't have an Uno board can swap it with nano

[@ElectronicsSimplified7]

Yes you can

[@rsiinvestor450]

*Recomemd by Emanul Perreira*

[@advance-maths]

Yesir

[@T-he_End]

Not working bro 😭

[@ElectronicsSimplified7]

Please explain what is not working in detail. Happy New Year!

[@T-he_End]

@@ElectronicsSimplified7 i have given all connections everything as per u said when uploading code i uploaded library and i have upload that time problem occurs "16 columns and 2 rows of lcd display" this code is wrong showing i removed that code and uploaded lcd display not show reading

[@T-he_End]

Pls tell bro very urgent project bro pls 🙏🙏🙏

[@hemanthjami1287]

bro code

[@ElectronicsSimplified7]

Codes are usually in the description and always on github and my website : www.electronissimplified.in

[@gregbennett2437]

DID NOT WORK!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

[@ElectronicsSimplified7]

Please elaborate

[@rampagegaming5645]

Is this working by using MQ135 sensor?

[@fakegamer8336]

does mq-2 measure co2 or co?

[@ElectronicsSimplified7]

Yes