Smoke Level Detector with Alarm using Arduino & MQ-2/MQ-5/MQ-135 Sensor

In this project, we have designed Arduino Smoke Level Detector using an MQ-135 Sensor for measuring the level of smoke in the environment. Simply we have interfaced the MQ-135 Gas Sensor module with Arduino and 16*2 LCD module for display. The Smoke sensor we used is the MQ-135 sensor. Smoke Detectors are very useful in detecting smoke or fire in buildings, and so are the important safety parameters.
Smoke Detector Circuit not only senses the smoke in the air but also reads and displays the level of Smoke in the Air. This circuit triggers the Buzzer when the Smoke level becomes higher than the desirable limit, this threshold value can be changed in the Code according to the requirement. Instead of MQ-135, you can use MQ2, MQ3, MQ5 modules as well. Basically, they all have similar functions.
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Website: how2electronics.com/
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[@ahmedsalemegy]

What is the maximum length between the main unit and the sensor?

[@electronic7979]

Excellent project

[@malikmalik33959]

thanks sir you r the next newton

[@wondetesfaye]

Tnx absolutely applied, even can modified also for better project specially to set air quality in a certain room.

[@ganeshgoli2426]

thanks bro for this video
its actually working

[@Hasanjanac]

great job.
thank you very much..

[@alfacity3760]

big thanks bro. your video so helpful. help me to done my work

[@PraveenCsena]

Thank you!

[@NHATNGUYEN-zy7ly]

May you help me with the arduino code if I use two MQ135 sensors at the same time in this project?

[@ShamoonWahed]

Hi, thanks for nice project. Can i use MQ-09 sensor here?

[@yashaswinitm9027]

Sir is there any necessary of adding library functions for the code

[@hansireneosluminarias3233]

What is the code for the detection of ammonia for this circuit?

[@sunitamageri728]

Are jumper wire is used for making this??

[@BrainBox470]

Working. Perfectly

[@deviarts2615]

Sir r u sure

[@BrainBox470]

@@deviarts2615 yes

[@deviarts2615]

Can u give u r mail address

[@AminNtulVEVO]

Is this the same thing for gas sensor ?

[@zyrobss4002]

if my mq2 sensor already detect a smoke before i put smoke near mq2...so its mean my mq2 is broken?

[@salauddinfeni]

Thank you

[@abeltamikasetiarini2469]

can you give a link to download library fritzing mq2?

[@anokhautomation4453]

Very useful tutorial 👍is it possible i can use MQ2??

[@itsnotamistakeitsamasterpi7475]

Which software do u use for demo

[@nagakowshik578]

sir is this possible to connect the fire sensor to the same project.
is very much imp to me sir

[@techtutorials1595]

THANKS

[@AnshumanAtrey]

led not lighting up, i tried direct with laptop and battery too but no working on breadboard

[@mustafamerchant3676]

Sir what is the range of the sensor?

[@sivakumarc3853]

what is the unit of that gas level?please

[@simonaguirre2344]

It works for sensor MQ-9?

[@mehtaharshil2064]

thank you
great job

[@satiswaran1446]

Hello

[@satiswaran1446]

Can u help me

[@satiswaran1446]

U know about Flowchart for this project

[@satiswaran1446]

Hello pls give the flowchart for this project pls

[@abhijithambalapuzha5954]

Help me to get the code for this project

[@roushanpaul5282]

Can you please provide the circuit diagram where potentiometer should be placed?

[@Elektromos]

You don't always need a potentiometer. If you link the E pin (Enable) on your LCD to a pin on the arduino (recommended pin 6), you can control the contrast that way through the arduino IDE. so first write int Contrast = 10; , and in the void setup() you would add analogWrite(6, Contrast);

[@mamathakumari4811]

Sir can it detect LPG gas?

[@wondetesfaye]

here the modification i did , first instead of buzzer i used BC547 transistor with 1K ohm resistor to the base and connect 5V relay to the collector to drive a fan and change threshold value to from 200-250 when to rises to the pick value the relay energized and activate the fan to extract the air. Tnx!!!!!!!!!!!!!!!!!

[@HowtoElectronics]

Wow.
Can you share a working video of at least 1 minute to my mail ID.I would like to upload that in the TH-cam channel.

[@firdauszainuddin9814]

what is the unit of the smoke level ? is it in PPM? does the sensor read the data in PPM by default ?

[@HowtoElectronics]

No its just a random value as it indicates analog voltage level

[@shashwatsharma5764]

I am getting the constant buzzer sound when the gas level is crossing the threshold. please explain why. I am using your code only.

[@HowtoElectronics]

Bcoz it takes some time to clear the environmental gases. And the value of gas level never goes down all at once. It happens slowly.

[@naqeebahmed9930]

I am not able to get code?

[@sarathicraze1497]

What is the cost of the project ?

[@TechUndefined]

Which software do you use for circuit diagram???

[@HowtoElectronics]

Download Fritzing from www.fritzing.org

[@balireddydeydeepya2335]

Is this working

[@madhanannam3123]

Can we use fire ,gas ,flame at a time to a single Arduino

[@HowtoElectronics]

Yes

[@madhanannam3123]

How To Electronics. thanks for your information brother

[@balaprabhakaran5938]

bro can we add two more sensor such as mq7 and mq8??? total three sensor. help ple

[@HowtoElectronics]

Modify the code. It has a provision to add multiple sensors using analog pins.

[@ramyaragavi7749]

Sensor is subjected to smoke but the output is 0 PPM .could you explain me?

[@HowtoElectronics]

Either your sensor is damaged or connection of analog pin is not correct.

[@ramyaragavi7749]

@@HowtoElectronics both the leds are glowing

[@passionatereligious3699]

Please make same project with mq 7 sensor

[@HowtoElectronics]

MQ2, MQ3, MQ5, MQ7, MQ135. These all are basically similar sensors. You can use any of these sensors.

[@BKammo]

Which battery we should use?? Please reply

[@HowtoElectronics]

Any battery of 5 to 9V

[@konlangodwin7592]

sir please what is the code you uploaded to the arduino

[@HowtoElectronics]

The code is already there in website. Link is im the description.

[@JobAlertsDaily]

I made this one but the problem is LCM showing only calibrating, but it's not showing other messages

[@alfredodobia9491]

Me too. Were you able to solve this problem?

[@nikunjkhitha3307]

Sir i am not able to find the code in your website

[@HowtoElectronics]

Visit from PC version to see the code.

[@mr.rajeshghosh1994]

Sir PLZ send me code, don't show in discription... 🙏🙏🙏

[@HowtoElectronics]

Code link is in description. Follow that: www.how2electronics.com/arduino-smoke-level-detector-using-mq-135-sensor/

[@jeongy.2850]

What is AnalogSensor-50 ???

[@HowtoElectronics]

-50 is used as a calibration value.
You can check yours and change on the basis of behaviour.

[@jeongy.2850]

@@HowtoElectronics Don't have -50 can you

[@shivkushwaha5356]

brother please make gas leakage detector using gsm module based project

[@HowtoElectronics]

Sorry, brother i dont have gsm module. But i will help you to make this project. Please inbox me via facbeook page.

[@shivkushwaha5356]

ok thanx

[@passionatereligious3699]

Is coding is same for mq7

[@HowtoElectronics]

Yes

[@BKammo]

Can we use mq4 gas sensor??

[@HowtoElectronics]

Sure you can

[@BKammo]

@@HowtoElectronics thank u very much

[@vaibhavthakre819]

I make all connections ok and installed program sucsesfully but display showing nothing and buzzer is continually making noice and also red led is blinked. please give us solution 🙏

[@HowtoElectronics]

U made wrong connection. Fix it according to code and circuit diagram

[@vaibhavthakre819]

@@HowtoElectronicsok I will check...tnx sir

[@vaibhavthakre819]

I checked all connections according to code and circuit diagram. But it not working...

[@bharathshreyam4209]

@@HowtoElectronicssame type of error it's coming

[@enriquethethird7253]

@@bharathshreyam4209 same problem here

[@sonuKhan-sh8oe]

Can u please send the code it isnt appearing in the discription

[@HowtoElectronics]

www.how2electronics.com/arduino-smoke-level-detector-using-mq-135-sensor/

[@sonuKhan-sh8oe]

How To Electronics yea i have gone through this but the code is not appearing under the source code heading

[@sonuKhan-sh8oe]

I have also checked your other videos the code is appearing under the heading but in this project the code is not there

[@HowtoElectronics]

Use computer to see code. Code is disable when you go through mobile phone.

[@mysura6652]

MQ2 and MQ135 sensor useing arduino code sir????

[@mysura6652]

both sensors used at a time??

[@HowtoElectronics]

Any sensor will work with same code

[@mysura6652]

2 sensors work in same time???

[@mysura6652]

Send me this project document sir?

[@AnkitRawat-my5of]

Sir how much money we required to make this .

[@HowtoElectronics]

Below 10$

[@AtodaAdota]

Show hands-on

[@passionatereligious3699]

With mq 7

[@HowtoElectronics]

Yah

[@itsnotamistakeitsamasterpi7475]

Plz answer my comment i have a project to do