This air quality monitor displays live C02 and tVOC levels in your environment. Firstly, PM2.5 refers to particles that are 2.5 microns or smaller in diameter. As for the Ozone sensor, in order to get more accurate outputs we must set the setTimeToRead() and setR0() values correctly according to the calibration example of the library. So we use smaller values like 5 to 10 seconds and thats why we dont get accurate results, but we have to use smaller values otherwise everything else will be frizzed for example for 200 seconds. I decided to make the case using transparent acrylic because I like how the PCB and the components look exposed and its also a great way to show off your DIY project. Soldering it all up now! Hope that he makes it and add instructions here as well. Could you help me understand why you used two transistors in the project? so burning helps it to clean itself and gives more accurate result. For creating 3D models for the PCB footprints, you can use any CAD software, save the files as .STEP files and import them in Altium Designer. In such I think you will get proper values. Regards..Ian. But your download links do not seem to be working. In the air_sensor() function you might need to celebrate your gasLevel value for your sensor. You can download this DYI Air Quality Monitor 3D model, as well as explore it in your browser on Thangs. MH-Z19 CO2 Sensor .. MQ-131 Ozone Sensor .. MP503 VOC Sensor . Regarding Altium Designer, looks really great however price tag is out of this world for hobbyist, unfortunately. in the attached schematic files, the voltage divider R1/R2 is correct, but the resistors R6/R7 are still interchanged (and now back up to 1M). The cable coming with the PM2.5 sensor has 8 wires, but you need only 6 wires. Thanks for the project. It also requires 5V to operate so you would require a board that supplies 5V like an Arduino UNO. With this the PCB is actually done, and whats left to do now is to prepare the cables that we will use for connecting the PM2.5 sensor and the display to the PCB. the sensing resistor for the Ozone-sensor should be 10k As far as is understand the datasheets The SGP30 is a digital multi-pixel gas sensor designed for integration into air purifiers, demand-controlled ventilation, and IoT applications. Thank you so much for this article! Copyright 2022 HowToMechatronics.com. Ive followed exactly your instructions and it works perfectly. Hey, glad to hear it, thanks! Hi Dejan, One more question to the Ozon-Sensor: is it correct, that it can be place in 2 ways on the PCB? I updated the article in the parts list section, please check it out now. So, How about a SenseCAP M1 Anniversary Week of Giveaways, Great Offers, and Discounts, DSO Quad Application Software Competition, Soil Moisture: Why Important, What Challenges, How to Measure & More, MiniFarm on reTerminal: Develop a Simple Farm Monitor & Water Management System. The banggood version looks correct. Dust is often not that bad but really small particles 2.5m and 10m in diameter can enter your lungs and cause health problems. display.Nextiondisplays have built-in ARM controller which actually controls the display on its own. VOCs can cause many negative health effects including headaches, irritation to eyes, skin reactions, dizziness and so on. Personally, we would recommend Seeeds Grove Laser PM2.5 Air Quality Sensor for Arduino HM3301. However, longer setTimeToRead means the program will be blocked while sampling and everything else will be freezed. Of course, there are ways to work this around. this is a great project thanks for the details you shared here. These modules are often cheaper and smaller in size than PM2 5 sensors.
It is always 0. Well the C is just a Text, t0-variable and you can change the C to F in its attribute tab txt value (bottom right corner of the Nextion editor). After that, the sensor will then calculate equivalent particle diameter and the number of particles with different diameters per unit which determines the air quality. This would be amazing upgrade! I hope you will have fun building one. this is my second project or third I think. I would LOVE to see a version #2 of this project with Wifi or NRF24L01 to publish MQTT data to my local broker. Yes. I ordered the parts a few weeks back and some are here so I thought I could put some of it together. As an example, I found the Mini USB connector using this Manufacturer Part Search feature. For uploading the display program, we need a microSD card where we can save the output .TFT file from theNextion editor. Youll need to hook this up to a microcontroller with UART input or wire it up to a USB-Serial converter and parse the data on a computer. 
Need inspiration for project ideas or project tutorials? The power to the board will come from a mini-USB connector to which we can connect 5V. I hope you enjoyed this video and learned something new. However, these modules are unable to sense small particles like dust. I like this project so much even from the Arduino robot arm with smart phone control Well yeah, that one is a bit different, but you can still use it as the pins that we need and use in this project are all on the same place. We can turn off the screen for the night, and the next day we can check the values from each sensor individually. I noticed that you mixed up the resistor values (for the analog inputs/transistors) between all your schematics Sensirions CMOSens technology offers a complete sensor system on a single chip featuring a digital I 2C interface, a temperature-controlled micro hotplate, and two preprocessed indoor air quality signals. All right, so now we can power up the device and upload the program. in the first symbolic overview you used 1M resistors for the analog sensing (VOC and Ozone) You can also try the web based Altium 365 viewer for project previews and file. // Reset pin # (or -1 if sharing Arduino reset pin), DHT11 Temperature & Humidity Sensor (3 pins), Make Your Air Safer: Alerting Indoor IoT Air Quality Monitor, PPD42NS Arduino Air Quality Monitor in 3D Printed Enclosure, Arduino Air Quality Monitor with DSM501A Sensor, DIY Air Quality Monitor with Sharp GP2Y1010AU0F Sensor. Two questions, same subject, the two-round sensors how do you pick orientation? Then we can insert the pin headers for the USB to UART interface, the display and the PM2.5 sensor, as well as the VOC, the Ozone and the CO2 sensors in place. In this timer event we also have a code for changing the background color for each sensor depending on its value. The CO2 sensor and the Nextion display also use serial communication. So what do you think of these air quality detectors? Of course, in order to fully understand how it works you need to learn and know how each sensor works with their libraries, as well as how the Nextion display works. Best regards and thank you for this very usefull and intresting project, For that power 5V to the mq135 sensor and put it on a clean environment for at least 24 hour before using it. Have you considered swapping the ProMini for an ESP 8266? For that purpose, first we need to bend its pins 90 degrees. HowToMechatronics is an education website in the area of Mechanical, Electrical and Computer Engineering. Improve reliability of measurements using PPD42NS sensor using modular 3D printed solution which includes exclosure box for sensor. I am a public health student working in remotes areas of the country. The particulates cause light scattering which is detected by a photodiode and then converted into PM concentration with the help of its microprocessor. With so many air quality sensors with different features and functions out in the market, it is hard to pick which air quality sensor will fit your Arduino / Raspberry Pi project the best. Which one would you pick? on more time: thanks for this nice project and the great files and everything, so it can be rebuilt. Right away I dont see any markings for pins or even pin 1 on the mq-131 and how about the mp503? If you did please consider supporting me onPatreon.
The brain of this project is an Arduino Pro Mini board which in combination with a 2.8 Nextion touch display provides a decent user interface. function it read the analog value from the Air quality sensor, and define the quality for that corresponding, . I also thought of an additional value, that can be given for AIR: Pressure! Im in the procces of gathering all the needed parts and would come back to you, if I have some other questions, if youre ok with it. On the other hand, the two resistors at the PMS5003 Sensor are used as voltage divider. These sensors are normally integrated with a fan to maintain constant airflow across the sensor. Next, we can insert the DHT22 sensor in place. With a IC digital interface, it simplifies the hardware and software design, enabling faster time to market. I found the results of this sensor to be quite reliable and along PM2.5 it can also output PM1 and PM10 values. Hey, Im glad to hear this, thanks for the input! Grove Laser PM2.5 Air Quality Sensor for Arduino HM3301, Grove Air Quality Sensor v1.3 Arduino Compatible, Seeeds Grove Laser PM2.5 Air Quality Sensor for Arduino HM3301, Adafruit SGP30 Air Quality Sensor Breakout VOC and eCO2, Notice on Product Name Change for Our LoRa-enabled Products. (Maybe it was the cheap part I bought!) R4 10k please confirm! This sensor is also equipped with a fan to maintain constant airflow across the sensing chamber. From the specs I think it should be okbut I am just 70% sure, just wanted to get your OK Once we upload the code to the Arduino, we also need to upload a code to the Nextion display.Nextiondisplays have built-in ARM controller which actually controls the display on its own. I have checked the geating supply and that seems to work ok as the input on the transistor is also reflected on the output of those. The two transistors are used for activating the sensors heaters. Your help would be appreciated as I have just finished ordering all the parts and sensors for my build. And thats it, our Air Quality Monitor is actually done. Thank you, Dejan! For attaching the PCB to the base plate, I used some M3 bolts and nuts. I would even suggest not using the ozone sensor at all unless you really need it. Using a simple rasp, I smoothed out shape. The display and the Arduino communication with just two wires using the serial communication. Before connecting it to the computer USB, first we must turn on main power of the device, because otherwise the power coming from the computer USB which is only 500mA might not be enough to work properly. The PM2.5 sensor is more suitable for applications such asair conditioners,intelligent air purifiers, etc while these air quality detector modules are more suitable for applications such as an air quality monitor, auto spray refresher in your bathroom or auto air cycling systems. I personally really like how this case turned out, plus, its functional as air can easily circulate around the sensors.. You can watch the following video or read the written tutorial below. HowToMechatronics is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon.com. Greetings Wolfgang Rupp from Germany. In the Nextion display program, we have a timer which runs in a loop, just like the Arduino code loop, and it constantly updates the numbers on the display. It would also probably be faster at refreshing the data and also have wifi (so ntp time and you could upload data somewhere). for the benefit of your reader, I suggest you list out the resistor value and also update your schematics. I have rebuild this project and it is great fun to do so, as everything has a great description and all downloadable files ghelped and worked fine. My question for you is, is there any way the data could be logged on an sd card that could be installed on the PCB instead of using a screen? Many times we feel very weak while waking up from the bed even after getting a good sleep at night. VOC stands for Volatile Organic Compounds and these are organic emission from products that we use on a daily basis like laundry detergents, cleaners, air fresheners, paint, makeup, and so on. For reading the VOC and the Ozone sensors we use analog inputs of the Arduino, while the DHT22 temperature and humidity sensor uses a digital pin for that purpose. I didnt draw all the lines because it would have been a mess and harder to see things. Well we would have to add a wireless module to it. The sensor has no direction to build in, correct? Awesome project, thank you! R2 1k I started with making the schematic for the project. Have You Ever Seen A Pig Live Stream | IoT Application on Helium Network with SenseCAP S210X Series. If needed, we can manually create or adjust them. Nevertheless, the students were most interested in your design, which could perhaps be updated with better sensors. In the coding part you will need to install some library to run the code. So, the Arduino reads the sensors and sends that data to the Nextion display. The quality of the PCB is great and everything is exactly the same as in the design. There is no direction mark or anything else. I have updated the article in the parts list section, please take a look now. hello have you seen my arduino nano version ? Please note that for the VOC sensor we are only reading raw data from this sensor, not ppm or ppb values. However you did figure them out quite well, and your points are correct. I started by inserting and soldering the smaller components first, the resistors and the two transistors. there is two main function in the code sendSensor() and air_sensor(). They are able to respond to carbon monoxide, alcohol, acetone, thinner, formaldehyde, and other slightly toxic gases. nice project. Todays guide will cover and compare these few air quality sensors which fall under 2 categories: Before we move on, we must know which TYPE of Air quality detectors we want before we purchase one. This module is a perfect choice for dust detectors, intelligent air purifiers, intelligent air conditioners, intelligent ventilation fans, air quality testing, haze meters, environmental monitoring, and relative products and applications. Now I will show you how I designed the PCB for this project using Altium Designer. TheNextiondisplay has a dedicatedNextioneditor where we can create all these stuffs. Christian. then connect the sensor to your circuit and go outside with it and tune the right value for your place. Finally, running the ozone calibration code included with the library and changing RO in the arduino code really stabilized the readings. The CO2 gas molecules which are present in the air that we are measuring absorb a specific band of IR light while letting some wavelengths to pass through. And the sendSensor() function measure the temperature and humidity data with, function you might need to celebrate your. Just analog values from 0 to 1024. Very interesting Project, however, standalone is a bit limiting. Can you please point me to the complete BOM? Using a simple rasp, I smoothed out shape. Particulates are the most harmful form of air pollution because they can penetrate deep into the lungs, blood streams and brain, causing many health problems. I will explain how each of air quality parameters affect us and how the sensors work. The whole device is powered with 5V through a Mini USB connector. I cannot locate a complete bill of materials on this project page. You could if you replace the Arduino with an ESP8266 or ESP32 device. Yep, right, I added a note right next to the schematics with the correct values. R3 10k Dejan, WiFi-connectivity would be a great benefit! Please stay healthy So, we definitely need a PCB for this project. Then using a 3mm drill I made all the holes for attaching the PCBs and connecting the two acrylic plates together., At this point, I removed the protective foil from the acrylic which, and to be honest, thats quite satisfying process. Next up we have the SDS021 sensor. That would make integrating it into a current System, be it homeassistant or other, very easy! Thanks. With a tiny outline as well, you can easily integrate it into your air quality monitor or system. The display has a card reader where we can insert the microSD card while the power is off. Hi Dejan! The display has a card reader where we can insert the microSD card while the power is off. Next, we are using the MH-Z19 sensor for measuring CO2 or carbon dioxide. Ensure proper ventilation in your indoor space. Next, for soldering the DS3231 Real Time Clock module again, first we need to bend the pins 90 degrees. Here are the Altium Designer project files: Altium Designer files including the project file, libraries and .STEP files of the 3D models of the electronics components: Ok, so once I finished the PCB, I generated the Gerber and the NC Drill files, put them into a single zip file, and so I was ready to order the PCB to be manufactured. There should be a connection from pin 6 on the MQ-131 to the A0 input of the Arduino. This sensor performs better in providing qualitative results over a wide scope of target gases. On the second page we have waveform, which gets the values from the stored values from the Arduino. For making the opening for display, first I made two holes with a drill. Don't forget to check my 575K+ subs YouTube Channel. Well yeah, the Ozone sensor reading is a bit complicated as it uses blocking (delay) function inside the library. As for the electronics, I think you should be fine as if you connect everything as explained everything will be fine. 
They are Arduino compatible and have built in WiFi. So, lets get started. Great project. Nevertheless, so lets take a look at the circuit diagram now and explain how everything needs to be connected. Then I passed through a blade from a mini hacksaw and carefully cut the shape. 2 Positions switch , Capacitors values: 0.1uF ceramic and 10uF electrolytic. Hi, this is a great project, and I am really happy that someone took the time and dedication to do this. Here you can download the Arduino Code and the Nextion Display Program: For uploading a sketch to an Arduino Pro Mini board, in the Arduino IDE first we need to select this board, select the proper version of the processor, select the port and select the programming method to USBasp. nice that you publish a project again, I always wait with excitement for the next projects, I will definitely build your completely new project, I have everything on order except the passive components. However, first we need to solder the pin headers to it. For making a PCB for this project, Im going to use Altium Designer which are actually the sponsor of this video. DIY Arduino air quality monitor which can measure surrounding air quality also shows temperature and humidity in your room. Not to mention, it will be perfect for beginners or anyone who wants to get rid of jumper wires and soldering as it is equipped with our Grove connector for you to easily plug and play into your Arduino. Can we use NRF24L01 module make it send massage when are away. A specific electrical current pass through a metal substrate and the resistance changes according to the amount of gas present. Does the oriantation matter? the current limiting resistors R5/R7 for the transistors Q1/Q2 should be 1k Hey, glad you like it. The PM sensor RX pin operate at 3.3V, so with the two resistors we make a voltage divider which drops the 5V coming from the Arduino to 3.3V. I now follow you on all medias now, Nevertheless, now I will walk you through the entire process of building it and explain how everything works. Emerging IoT, AI and Autonomous Applications on the Edge. CCS811 supports multiple measurement modes that have been optimised for low-power consumption during an active sensor measurement and idle mode extending battery life in portable applications. Hey, thanks! Hi Dejan, This sometimes happens because of the poor air quality in the closed room at night. Now we just have to remove the card, switch on the power again, and our air quality monitor will start working.. It is connected through a four-pin interface cable to a platform. See also:The 8 Best Arduino Starter Kits [2021 Update]. It can respond to carbon monoxide, alcohol, acetone, thinner, formaldehyde, and other slightly toxic gases. Theres also a dimming function through which we can lower the brightness of the display or even turn it off completely. Pin headers . This sensor comes at a slightly higher price tag compared to the above 2 sensors and has similar specifications compared to the other sensors. Meet the Third Batch of 28 Free Hardware Winners: Submit Your Sustainability Project Ideas to Seeeds IoT Into the Wild Contest for Sustainable Planet 2022 by August 8th! Also, we can set design rules how the auto routing will make the traces, set different widths for each net and so on. Tutorials, Tips, Tricks, How It Works, Projects, Examples, Source Codes, Download files and much more can be found here. The resistors for activating the heaters of the two sensors (connected to the base of the transistors) are used for limiting the transistor base current. Nextion 2.8 Display .. DS3231 RTC . It also measure the room temperature and humidity using DHT11 and shows the data on a OLED display. This is a low cost Air Quality Monitor which can monitor the air quality of a room using MQ135 air quality sensor. I will try with ESP-01 . The sensor is using non-dispersive infrared principle for measuring CO2 in the air. If you dont mind that, you can actually set the in the setup section with the setTimeToRead(value) function. The first two lines of the code do that, and in order the Nextion display to accept this command or actually any command we need to send the three unique write commands. There is a wire missing on the schematic diagram shown above. This project no. As my Ozon-Sensor does not give any values at all, and a friend of mine got the exact same parts from me and built it as well: he gets values, even thogh he claims, that the values are a bit confusing and that there is too much dynamic in the values I would like you to confirm the following: R5 1k I think with a little work, you can do it. This evening, I finished the plastic enclosure of the system and everything is working perfectly! DIY Air Quality Monitor - Nextion program, For uploading a sketch to an Arduino Pro Mini board, in the Arduino IDE first we need to select this board, select the proper version of the processor, select the port and select the programming method to , Once we upload the code to the Arduino, we also need to upload a code to the. So, in this tutorial we will learn how to build our own Air Quality Monitor which is capable of measuring PM2.5, CO2, VOC, Ozone, as well as temperature and humidity.
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