DIY Air Quality Monitor - PM2.5, CO2, VOC, Ozone, Temp & Hum Arduino Meter

[@HowToMechatronics]

I hope you enjoyed this video and learned something new! If you'd like to support me making more content like this, please consider supporting me on Patreon: www.patreon.com/howtomechatronics

[@syedsulaiman8380]

Why have you been SO inactive during the past couple months

[@Sonex1542]

You really should need to form a KIT COMPANY for STEM. Many kids and adults would benefit from a subscription where each of your wonderful kits would teach them much more than they could learn in schools. Your amazing skills should not go to waste. I'm surprised how much effort you put into these projects, you are great engineer, teacher, and person to provide these great ideas and videos. The biggest problem for individuals is sourcing small quantities and the waiting from each vendor on parts. A kit would allow people to quickly move forward to learn and enjoy. The only item would be the 3D printer, which many people who are interested in STEM already have.

[@hareemqwerty1272]

Please RASPBERRY PI 4

[@En1Gm4A]

Can one buy this fully assembled ?

[@diyk-h-m2423]

hello brother can you tell me how about to use sleep mode LCD 2.8 inch TFT types SPI with arduino uno please brother . thank you your video bro

[@bertramusb8162]

Hey man, just wanted to complement you on your thorough explanation of the function of each sensor, especially including brief info on sources of contaminants. You get a lot of info in without getting off track or droning on and on, and it makes for a great video.

[@tzisorey]

I like how he explains how the sensors work on a mechanical basis, not just how they're used electronically. I should build one of these, for my oil painting area. At least the VOC part.

[@VenturaIT]

You can get a Sciosense APC1 evaluation kit for that, just plug it into your laptop and use the software they provide for that. The evaluation kit is different than the sensor by itself, the evaluation kit (EK) comes with the usb cable and software and it works perfectly for 1 sensor.

[@mayxnerde2952]

For the rebuilder: Correct resistors values: R1 = 1K, R2 = 2K, R6=100K or 1M, R7=1K have fun , Mike DF7MR

[@alizeearmet3834]

thanks and for R5: 10K?

[@dozog]

Don't get me wrong, the thing is very well made, and I understand that not everyone is comfortable around ESP8266, but this project seems to be a perfect fit for one of those. - No need for RTC (just get time from internet (at power up) ) - Upload new sketch over the air. - Check your graphs and data on any android phone (can even skip the display.. which is expensive)

[@HowToMechatronics]

You are absolutely right! Thanks for the input!

[@acerrusm]

RTC is always needed as backup in case when your internet connection is down

[@dozog]

@@acerrusm You can always display the current values from all your sensors You can also always collect values based on relative time (every x minutes), display those and sync the time axis with the internet time when it becomes available. The internet in my place is seldom down, and never for more than an hour.

[@TheUnofficialMaker]

@@acerrusm not really, if not real time-sensitive, in my experience internet down does not happen much, maybe different in your country.

[@josemanuelalogoadjomo7863]

nice content as usual, thanks!! pls the code explanation part is not boring at all, in fact is the most relevant part of a project, kindly do not be skipping it!!! most of the times i have got to learn new programming concepts trough your code explanation.

[@HowToMechatronics]

I will keep that in mind, thanks!

[@beehinddd]

​@@HowToMechatronicscan this instrument record and save the data?

[@haneen3731]

Your tutorials are great and I appreciate that you provide the STL files. However for those of use that want to learn to design specifically mechanical parts and robots, it would be great to have a series that explains more of the designing process! Thanks for sharing your knowledge and creative projects!

[@DivyanshMMMUT]

Thanks for explaining how the sensors actually work 🙏

[@piconano]

Excellent project for the right person. I built one 3 years ago. No LCD, since I used a ESP8266 module instead of a promini, and did everything through the browser. I only installed DHT-11, MQ-5, MQ-3, MQ-9 and MQ135, VEML6075 UV sensor, and DSM501A PM2.5 dist sensor, which was $4! I think my project cost about $25-$30 Yours is in excess of $100 without a PCB.

[@HowToMechatronics]

Yeah, that's true, the sensors I used are not the cheapest, but of course are more accurate and reliable.

[@Dreamtheimpossible38]

Hey there Would you like to share details please

[@isprithul]

I was just wondering, why not use BME280 for temperature and humidity measurements? It has much higher resolution and accuracy than the DHT22. Air pressure reading is a bonus.

[@kevin2706]

your channel is one of my best discoveries, thank you

[@voicesarefree]

Super cool! Has me considering a touchscreen and custom PCB as well. Only thing I would change is to network the device and log the measurements somewhere that Home Assistant can integrate.

[@HowToMechatronics]

Yeah, that would be better!

[@williamwatkins821]

What would be the best way to do that? I’m trying to integrate this into my HomeKit using homebridge.

[@tza50]

Through an esp8226 potentially

[@leeoliver2969]

A fantastic video. If you decide to carry on with this project a carbon monoxide sensor would be a great addition to help protect people who use gas for heating.

[@rshidlo]

Great Project. do you know what will it take to use a NodeMCU instead of the Arduino? I want the same setup but that will also connect to Home Assistant via WiFi

[@wilyc0y0te]

Did you ever find out how to integrate it into Home Assistant?

[@Freestila]

Ever thought about using an esp to integrate in smart home systems instead of the arduino? Would also have 3.3v diectly

[@TeslaNick2]

ESP32's are a much better choice for the reasons you cited.

[@negotiummeum9643]

Good project. Now add CO, HCOC, PM10 and it will be one of best air quality meters!

[@hugodc1225]

Actually for the PM10 @2:27 the sensor can already switch between them and the upgraded version can do somewhat better (PMS7003) what are the others polluants are you talking about? HCHO? sry not really my field. I'm interested in making one of these air monitor based on that one.

[@negotiummeum9643]

@@hugodc1225 Oh so PM1 and PM10 are included? That's great! I missed that one, sorry:) Well HCHO (hcoc was a typo) (although the real formula always used to be CH2O ... dk why manufacturers have changed it to HCHO) is Formaldehyde - one of biggest indoors pollutants nowadays to worry about. And CO (unlike CO2) is Carbon Monoxide - an infamous "silent killer"! The stuff is lethal. There could be a fire in neighbor's flat and CO can kill you even before your smoke detector/alarm triggered. Although of course it is worth to have CO detector alone (next to Smoke detector) in few places of your home.

[@vigasan]

Great video, I made a similar system based on ESp32 without display but It can be integrated in home Assistant so you can check data also remotely

[@Dreamtheimpossible38]

Hwy there Would you like to share details please?

[@AndyPandy-t1f]

My greatest compliments for your design. I build it and it works perfectly. Very good thinking about features and timeline. I made some adjustments so I can easely exchange sensors, but for now I cannot imaging what I should change. Calibration is for me less important compared to more or less value readings. Maybe the loss of data when disconnecting the power could be a minor issue to solve. Thanks for all your time! Great job!

[@francenred1415]

Hello! I'm a student and I need to build this for my studies. Could you please provide the materials you used and where did you order it, if you don't mind? It will help me a lot. Thank you!

[@siu703]

@@francenred1415 hI! did you find how to?

[@Morpherinc]

Hello, Did you manage to compare the acquired data with a calibrated source or calibrated sensors? I am mainly interested in the PM2.5 sensor. Regards!

[@bobojenkins5805]

Exactly

[@AB-fo3hj]

I think the schematic need to be updated, i checked the schematic on your website and it doesn't show how the analog sensors are connected to the ADC, and here 5:20 both are connected to A0? is that why you control the heating element by D6 & D7? shortage of ADC pins?

[@mikemesec]

Only the mq131 is connected to A0. Mp503 is connected to pin A1. I built this with the board he designed and everything works fine. Must be a mistake in the first schematic.

[@jantepas7511]

Great project, and integration with home would be great! Thanks for this project!

[@HowToMechatronics]

Glad you like it!

[@guinieroo]

Great video! As a environmental eng, I can tell you thats amazing. Low cost and very good precision. Did you comparate with a real sensor, like a industry sensor?

[@jstro-hobbytech]

That's awesome. Acrylic is 200 dollars a sheet where I live in Canada

[@iammrsnesbit6014]

Bloody genius. I hope one day I have the time to have a crack at this. Can a complete kit be ordered online somewhere? Or maybe just the completed KIT 😂 GC 👍

[@PatienceNzuza]

Can you include temperature / heat generator which will turn on and off within specified range of temperature and humidity. Ventilation when co2 is higher than required

[@kenbarbee2672]

Great Project - Got everything on order! Can't wait to build! Can you point us to a complete bill of materials for the passive PBC components?

[@DDryTaste]

These sensors don't have to be calibrated?

[@bict24]

Great Project. Thanks for explaining how the sensors actually work.

[@lidarman2]

This is awesome. I was going to make something similar a couple years ago but had trouble finding a decent ozone sensor and the VOC sensor I have is basically useless. I also want to add a GPS for portable use..

[@coster1983]

Excellent project, soon to appear on Wish for $21.99 delivered next month!

[@davenaidoo1286]

It's one month later now. Hmu with a link my g😂

[@wegsteryt5524]

Congratulations on 500k subscribers!

[@HowToMechatronics]

Thanks!

[@ejmakela7525]

Sorry if I missed it, but does your design also allow me to download the collected data, such as via an SD card? (Via Wi-Fi would be ideal, or course, but I suspect that this would require more components and software.)

[@astrostevehobby5096]

A fantastic project. I want to do a PM2.5 indoor air project, and this gave me ideas to add extra sensors. I'll be using an ESP8266, as I want connectivity to my Home Assistant home automation. I'll send MQTT messages to send the air quality data to the home automation system. It'll be a while though, I've got a couple projects in front of this one.

[@XuanGOD]

I also have the same idea, may i ask how do u power the esp8266? I want to power by batteru but don't know how to do it

[@astrostevehobby5096]

@@XuanGOD I was just going to use a USB wall charger to power it, with the 5 volts it outputs. I haven't ever used a battery to power one.

[@XuanGOD]

@@astrostevehobby5096Thank you, I also want to ask that my sensors and LCD use 5V so can i connect all of them to the VU pin?

[@astrostevehobby5096]

@@XuanGOD All the boards are labeled a bit different. But as long as the sensors don't take too much current, you can power them from the 5v pin. You might want to Google "Feeding power to Arduino: the ultimate guide" and read about how to feed the boards power (even batteries). For my larger projects where the parts I hook to it take more power than the Arduino can supply, I use a regulated 5v power supply, and input power to the 5v pin (not recommended, if you read the article I mentioned), and I can power the sensors not from the Arduino itself, but from the power supply, which can provide more power. In that case, just don't let the power run thru the Arduino first, the traces can only have so much power running thru them. I'd assume most projects and sensors would not be a problem. You'd have to Google how much power your particular board can supply. For the ESP8266 type boards - I have not used one of those yet, and an unfamiliar with them, except that it can be supplied with power from a USB charger.

[@Dreamtheimpossible38]

Hey there Would you like to share details please

[@kevinputraadiwijna463]

Awesome explanation as always. Out of curiosity, did you consider using BME680 sensor from Bosch during the design phase? Because it does the work of PM503 and DHT22 combined, plus it even has some kind of pressure sensing, which affects whether pollution levels build up.

[@dkeisk]

Bravo 👏👏👏 . One question though 😋 i would like to send data to an api endpoint like grafana to keep track of the registered data. Any idea if this is possible?

[@baiguppyhouse3490]

Hello can I ask some questions, I try to build your project, and buy the PCB to jlcpcb, I don't know why the project is not working I already uploaded the code and everything is seem ok but the TFT screen not responding to the sensor, all zero value

[@melbourneopera]

I would if it needs to calibrate for knowing its accuracy,tolerance, error etc.

[@naeemulhoque1777]

this build is so clean

[@friplay7741]

great idea to assemble all important sensors on one board. A value of 1M is displayed in the schematic for R7. Looks faulty. I think, the value means 1k?

[@mayxnerde2952]

Yes, I dont know witch value for the resistors are right? I wish me a Part-list of the resistors and Condensators please, its a great Project, the PCBs are on the Road to me from JLCPCB ;-) Thanks in deet Dan, Greets from DF7MR Mike

[@mayxnerde2952]

R7 1k. R6 100k

[@mikeg3660]

Excellent design and build. Thanks for sharing.

[@wolfgangrupp5297]

Hi, Another great project, perfectly implemented Greetings Wolfgang from Germany

[@HowToMechatronics]

Hey, glad to hear it, thanks!

[@StefanoKocka]

1:51 and 4:20 those can help detect particles and ozone gases made by laser printers.

[@joylessdave]

have you thought of adding an NO2 sensor, as you are already monitoring O3 you can correct for the crosstalk of o3 with no2 in the no2 sensors. no2 being one of the main air quality pollutants causing problems.

[@caiolira09]

awesome project as always!

[@HowToMechatronics]

Thank you! Cheers!

[@andycrask3531]

Yes another top quality project worth the wait :)

[@HowToMechatronics]

Thanks!

[@LarkspeedNL]

A very nice project that I was very much interested in for VOC monitoring until I realized that you can actually buy an air quality monitor that covers VOC's for less than just the PM2.5 sensor in this project costs

[@vasilypuupkind626]

Thank you for ideas for really useful project. Happy new 2021!

[@HowToMechatronics]

Thanks, same to you!

[@alexanderking7251]

Hey Dejan, On my monitor after is saying “Warming up sensors”, is not showing any value. Everything stay at 0. Made sure the upload button is not on. I don’t know what to do. Do you have an idea why is doing that?

[@hernandovasquez1801]

Congratulations for this project, I wonder if this detects dangerous gases as hydrochorich acid fumes or others, I'll appreciate your answer

[@skshakal2702]

Hello sir...is it possible to make this project wirhout ozone sensor? What will be the nextion code then can you plz help me??

[@whatthefunction9140]

This is really nicely done. What is the approximate price? Would love no display version with a phone app or web interface

[@allcrafter3747]

@@Friendroid never! Alone cow sensor costs 40$

[@lasersbee]

Just add up the price of the parts that are linked in the description.

[@vasilypuupkind626]

Link your sensors with ESP8266 or ESP32 and Blynk e.g. You'll get no display and phone application.

[@johnwinchester7472]

great project, my workplace needs a few of these is there any way to add a decibel meter to this project ? is there a way to add a carbon monoxide sensor and monitoring? and is there any way to have 5 of these units report back to a central device for real time monitoring and data logging ?

[@TheUnofficialMaker]

Sure.

[@salazar.eduardo]

High-quality content, congratulations!

[@HowToMechatronics]

Thanks!

[@SirHackaL0t.]

But low quality air! CO2 that high means you need more ventilation in your bedroom.

[@batchrocketproject4720]

Fabulous build. Thanks for posting and for all the linked details. 💯👏

[@shehrammalik7890]

Very good and very informative video. The next upgrade to this project should be an air purifier. The air quality will send feedback to the fan when the desired value is achieved, the fan will automatically stop.

[@craigjensen6853]

What happens if you fart in it? Which of those figures increases and by how much?

[@ShannonJosephGlomb]

Build it and do an experiment with it with your family and friends then use AI to find patterns in the data and publish a paper I'm 100% sure the youtube AI will be all over that 😂

[@lightdark00]

Voc and CO2 should go up, if particulates go up, be worried.

[@xpsmango4146]

There could have been a better way to get a decent reply

[@karlheinzneugebauer]

@@lightdark00LMAO

[@MrTR909]

looks I was little naive, when I explored Altium. Prices starting from roughly 400 bucks per month. what's that for a recommendation, it's definetly for the ordernary hobbiest (if this word even exist lol). or did I miss something on the website?

[@mahalingamrajaratnam6121]

Hello there, do you sell all the items listed and support with the project build ?

[@mahalingamrajaratnam6121]

is that possible to talk via mobile?

[@zallfir_id3595]

hello brother, I want to ask about the application used to create the schematic of the cable line in the picture? please respond thank you

[@zallfir_id3595]

the schematic explanation of the cable line at the fifth minute, what application are you using, brother?

[@altitude1039]

Wow! This is great! If it also included Radon and Carbon Monoxide I would definitely buy one. Do you sell these?

[@lucdrouin2625]

Excellent choice of project! Why? People have been spending much more time indoors during this year of the COVID-19 Pandemic. Providing a completed working system and not just a prototype was wise. Because this project is important to the world's population right now, I would suggest: Phase 1, 2, 3, etc ... future upgrades of this project that would verify accuracy or readings, allow internetworking of nodes and of course IoT. Thank You Sir!

[@AdySaz3658F]

Hey which software do you use to make the art in which you explain the sensor like on 3:34

[@maggiegendy175]

Hi Dejan thanks for the amazing project I was just asking about the Mq131 sensor, its mentioned in the datasheet that it should be preheated for 48 hours It is also mentioned for Mq7 sensor that i want to use ? can u guide me throgh this? Can i use the sensor straight away after purchasing or should i do the preheat procedure ? and how can i do that ?

[@shafiqalom8408]

Really nice and realtime project that can work as well as weather station, super 💙💙💙

[@HowToMechatronics]

Thanks! Well yeah, the possibilities with this project are endless. I mean, you can modify it however you want.

[@SilvanoP]

hello do you considered add a radon sensor?

[@electronic7979]

Nice project

[@schinderiapraemeturus6239]

very cool project, you have inspired me. We need a customizable portable VOC sensor at our company for our service techs, this would be a great option. Thanks!

[@hyungmonam5903]

wow! Great project and tutorial as always! thanks a lot!

[@b0br0ff1974]

Hi, very nice project. Do you have similar project based on ESP32? Would be nice to have integration with smart home and reporting via Mosquitto.

[@turbovw62rag]

how can i buy one of these already put together? but with a usb-c charge plug

[@alexanderking7251]

Hi Dejan, I have a problem with the code, is giving me some errors, can you please help me? Compilation error: no matching function for call to ‘DS3231::DS3231(const uint8_t&, const uint8_t&)’

[@contrad05]

Am I correct in understanding that that custom PCB board cost $2?

[@jimadams7765]

Excellent vid. Happy holidays. 💙💚💛🧡😎

[@HowToMechatronics]

Thanks, same to you!

[@MrRenoman2011]

This is a great video. Is the circuit board available through you. I tried going to the site that makes the boards but there were many questions I did not understand. Thanks

[@David-oq6tv]

Thanks for all the great information! Do you have any recommendations for a company that 3D prints cases? I'd like to do something similar but hide the inner workings.

[@CarlBurnss]

Natural gas in a small and constant presence give you a slowly creeping migraine. i had this problem with a heater, the heater sucks up dust and cloth up the ventury, thus leaking gas every 5 months. Really want to know which meter measures this, VOC ?

[@fabriglas]

With the Screen can you use an alternative?

[@thzzzt]

I'm curious if anyone has built more than one of these, stood them side by side, and received the same readings on both.

[@nextlevelbruh827]

Why would you expect industrial level accuracy from a cheap DIY project?

[@thzzzt]

@@nextlevelbruh827 Well, if this project is just a toy meant to teach the principles of such a device, I'm not interested. On the other hand, if it can give reading +/- 3% of reality, then I'm in. The finished products like this offered on Amazon garner terrible reviews. That's where my skepticism comes from, and also my desire to build my own.

[@lightdark00]

You don’t even need to build two, just buy multiple sensors and hook them up and test them at the same time to one arduino. Then use the best components

[@danmusiceasy]

Does anyone know what are the Altium files for? Do they also need to be uploaded to the website for ordering the PCB? The Gerber files seem enough in order to order the PCB, but I don't want to make a mistake.

[@muhammadibraheem1956]

I am interested for this project making for my FYP

[@Danixu86]

Nice project!!. I'll try to do it by myself, because copying, you doesn't learn... Altium looks good, but is too expensive for makers like me.

[@TheCitygear]

$3000 per 1 year.

[@Danixu86]

@@TheCitygear Yep, too much... Is more that what I'm paying for my house.

[@05吳浚翔]

hi, how can i buy all done assembly module from u?

[@josela6249]

the altium design file link is broken, can you help to fix it?

[@catafest-work]

what is the estimeted price for this device ?

[@povilasvaiciulis7931]

what program you use to meke thease electical wiring diagrams ?

[@ouchanihida3327]

I have a small problem. I need to use components that are compatible with Arduino. A position sensor (so I use a GPS module. This GPS module must be Adafruit Ultimate GPS Data Acquisition Module (GPS Included)). A position storage (with an SD card that must work with an SPI link). A bluetooth interface. A IHM to visualize the route (using an Android tablet that is compatible with a bluetooth module). you can advise me to use what as a component . because it's 3 components must be compatible with Arduino and an Android tablet IHM thanks to a Bluetooth module.

[@pandawangoprek]

what software do you use to make the layout as shown? Minute 5:20

[@dmitriypak6405]

Very good educational video! Thank you!

[@trader_gu]

Very well presented. How do you make animated sketches such as how the PM2.5 sensor is working (2:07)? Which software:)? Thanks for sharing, this video is gold.

[@igorenduro]

Отличное видео, спасибо за гайд друг!

[@8eck]

Will this help to detect neighbors smoking cigarettes?

[@robberenschot504]

Hello, how do I place the MQ-131 on the pcb? There is no "orientation" info on the MQ-131. Very good project!

[@mfr8471]

I had the same issue. By reading the specs, I am 80% sure it does not matter in which orientation of the 2 possible ways you install it.

[@dinesheddy9337]

I'm facing the Same issue any solutions??

[@benlightfoot3278]

Great project- all put together- just can't get past error messages in arduino code related to github- anyone with a working file?

[@pegzod2527]

Hello very good job... I m going to made it one. Can you explain the pinout of the mp503 and the mq131 when I place component in jlpcb the pin don't match with yours... Thanks

[@pegzod2527]

No help no answers... Ok

[@dinesheddy9337]

@@pegzod2527 i too have the same problem did u find the solution for this! Pls reply

[@ariesandhi]

Hi Sir can I buy the end product from you? How to order your DIY made product?

[@maxhouseman3129]

Nice quality and explanations. Respect for the handwork, I mostly use a laser for it 😎 Greets from a medical engineer.

[@HowToMechatronics]

Thank you! Well I do plan to make a CNC machine so I don't have to make things like those by hand. Cheers! 😀

[@maxhouseman3129]

@@HowToMechatronics that's a good idea! Do you share your build process here?

[@johnjeromeo.colico1259]

Don't you think the CO and the OZONE are too high? ( 35ppm for CO) and 75ppb for ozone

[@JuanSanchez-rb4qu]

Can any of these sensors detect carbon monoxide? or I would have to add one for that?

[@madhukulashri1547]

brother can i use pms7003 senser module please tell fast its an urjent

[@RatingARKReviews]

Great video and very informative!

[@HowToMechatronics]

Glad it was helpful!