How to calibrate an MQ-2 gas sensor || Arduino tutorial

In this short tutorial I'm demonstrating how to calibrate an MQ-2 gas sensor and get your readings in ppm units. I'm assuming you don't want to spend hundreds of dollars for a calibration kit. The method shown in this video is based on a piece of Arduino code created and shared for free by a company called Sandbox Electronics.

See the original video - How to use gas sensors with Arduino:

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Video, edit, voice by Chris Lorkowski

Music by RataxesUK - Everything [No Samples Edit]

[ShiroiAkumaSama]

Finally someone mentioning that heating is a one time process. I was looking for this answer for a while now.

[TobiasDettinger]

I have the arduino ads1015, how to write the code for my board properly?

[anitakenchannavar]

how to detect only the oxygen levels in the air, which sensor i shld use

[rmus]

hi thanks for the video its really helps me a lot. But i have one question. For mq-6 how do i set the RL value since mq-6 using the potentiometer?

[adailyllama]

Many Thanks! Exactly what I needed for my air monitoring project.

[rolandberendonck]

Do you or anybody know what is a sensative sensor for detecting secondhand smoke (cigarette smoke). I still cannot find such a sensor and a dust laser sensor does not fit because it doesn't distingquish cigarette smoke from any other smoke. Please help.

[najeebkhan]

Hello Sir. I am Using this calibration code for MQ-7 CO sensor, its work good. But Why sensor does not give any value with out giving smoke?? Please Suggest any Help

[amvip]

Hi There, Thanks for the code, I tried the code with my MQ sensor and edison board, it gives me values as 0 only. How do I get it to read different values?

[isRonPaul]

why do i get a reading with 10-digit number (2643534534ppm etc) and the resistance varies after every reboot of the board? (from 3.26 to 15.7kOhms etc) ....

[KifPH]

Is the preheating continuous or can i do it in interval? Like 12 hours then later next day another 12 hours

[narima]

I bought the one with the board (which have potentiometer, led light, etc.) so, what is the RL value for that? In the sandbox website it was 20kohm, but then it won't read any gas, I even emptied my lighter.

[peacecheap]

In datasheet, mq-2 only can detect LPG in 200-5000 ppm, but in demo it can detect lower than 200 ppm.
Is it really accurate for measurement of LPG concentration?

[rahatkataria]

Dude, That was superb. Thanks for sharing it!

[konstantinost]

This is free air calibration, after calibration when the code is running, the CO ppm result the serial shows is 0, shouldn't it be 20000 (2%) which is the known atmospheric CO% concentrate?

[refrion_robotica_automacao]

CONGRATULATIONS. YOUR VIDEO WAS VERY USEFULL AND THANK YOU VERY MUCH FOR SHARING THIS INFORMATION. I WAS FACING SOME PROBLEMS WITH FALSE ALARMS, NOW WITH THIS CALIBRATION IT IS WORKING PERFECTELLY.

[madanmohanraok]

Hi,
Great video,
We are looking for calibration of PMS-5003 Particulate matter sensor.
Any suggestions?

[simplesecomumcidadao]

Thank you friend, I asked including chatGPT, it just says calibrate, thank you for your simple and understandable explanation. Can I do the same operations on MQ-135?

[onjianye]

Hi may i know does this example included the adjustment of temperature and humidity around the environment?

[matcha]

Hi i wonder know how to you get this value LPGCurve[3] = {2.3, 0.21, -0.47}; and i confused how u can get point2: (lg10000, -0.59) --0.59 from the datasheet given?

[clip]

When hook up MQ-2 with 5V onboard pin, the voltage drop to 4.86V
Is it better to use the external very smooth 5V regulator ?