Innovation: Indoor Hand-held Co2 Demodulator (for Covid-19 Purpose)

Project Background

Most transmissions of coronavirus occur indoors, the majority of those cases are caused aside the aspiration of particles containing the virus. The best way to prevent the spread of the virus into the home or workplace is to keep infected people out. However, about 40% of cases are asymptomatic, and these asymptomatic infected people can shut up broadcast the computer virus to others, which is difficult to fend off.

Shelly L. Miller, a professor of mechanised engineering science at the University of Centennial State Boulder, recently published an article on the Popular Skill website, which is about the best way to reduce the risk of indoor infections;

Acquiring fresh bare

Monitoring carbon dioxide concentrations, and using air purifiers. Fresh air The safest indoor space, according to Miller, is one in which there is a constant supply of outdoor aerial replenished to replace the dirty air inside.

In commercial buildings, foreign air is usually imported through heating, ventilation, and air conditioning systems. In homes, after-school vent can enter through expressed doors, windows, and various gaps.

In short, the freshman the outside air into the room, the better. The introduction of such air can dilute all indoor pollutants, such as viruses, and reduce human contact with viruses. State of affairs engineers use the air replacement rate to quantify how much outside air enters the board.

Although the circumstantial replacement rate depends on the number of multitude and the board size, most experts believe the ideal condition is about half a dozen air travel exchanges per hour for a 100 square foot room with three or four people present (about 9 square meters).

During the global pandemic of infectious diseases, the renewal frequency should Be higher. A 2022 study showed that baseball club air exchanges per 60 minutes reduced the spread of plain acute respiratory syndrome (SARS), Eye East respiratory syndrome (MERS), and H1N1 grippe in hospitals.

However, many buildings in the US, especially in school day, behave non get hold of the advisable aura exchange rate. Fortuitously, it is non difficult to significance more outside air into the edifice. To begin with, restrain doors and Windows subject is a good way. Furthermore, placing an blower at the pinch of a window can increase line exchange a great deal. And in buildings without operable windows, nonpareil can qualify the mechanical ventilation system to work more outdoor vent indoors. But in any room, the more masses in the elbow room, the faster the air should vary.

Monitoring airwave circulation victimization Carbonic acid gas concentration

How perform people have sex there is enough air exchange in their rooms? In that location is a simple way to make that determination. Every fourth dimension we exhale, we release carbon dioxide into the air. Since coronaviruses are most often spread by ventilation, cough, or speaking, carbon dioxide concentration can be used to see if a room is occupied with the possibly infectious exhaled breather. The carbon dioxide concentration allows us to gauge if sufficiency fresh air is coming into the room.

The outdoor Carbon dioxide concentration is only somewhat above 400 ppm, and the CO2 concentration in a well-ventilated room is about 800 ppm. If the ppm of a room is high than that, then the way may want more ventilation. A researcher reported last yr that ventilation problems impacted an outbreak of tuberculosis transmission within Taipei University. Many suite along campus were inadequately ventilated, with carbon copy dioxide levels exceeding 3,000 ppm, and the outbreak was subsequently brought under control when engineers improved air circulation and reduced carbon paper dioxide levels to less than 600 ppm.

Since coronaviruses are airborne, a higher concentration of carbonic acid gas in the room may mean a greater chance of spreading the virus if an infected person is indoors. Based connected the above research, Miller recommends keeping the CO2 concentration beneath 600 ppm so that we can effectively control the heavy spread of the outbreak. We bequeath use the existing electronic module to pass wate an instrument that assists us to monitor the indoor CO2 concentration, you can customize the alert message, and even determine whether to open the windows and doors for airing automatically supported the actual Carbon dioxide concentration. Of course, you toilet also grease one's palms CO2 detectors, sensible make sure they are accurate inside 50 ppm.

Stair 1: Preparation

Before we start, we have to organize approximately electronic modules and devices we needed:

  • Woodlet - Carbon dioxide and temperature and humidity sensors (link)
  • Seeeduino XIAO Expansion board (link up)
  • Seeeduino XIAO (link)
  • 3.7V Lithium Battery
  • 300mm*300mm*3mm basswood board (quantity: 1)
  • M3*60 double-end stud (amount: 4)
  • M3*20 look-alike-end stud (measure: 6)
  • fM2*60 doubling-stop stud poker(quantity: 5)
  • M3 screws (5mm≤duration≤10mm) (measure: 20)
  • M2 screws (5mm≤distance≤10mm) (quantity: 10)
  • screwdriver
  • double-sided paste

Step 2: Hardware

Connect the CO2 sensor to the IIC port of the Seeeduino XIAO Enlargement board, plug Seeeduino XIAO into the expansion board. Burn the program provided by the adherence. Then you buns fancy the current temperature, humidness, and engrossment of CO2 for the rife surroundings connected the screen. If the current concentration of CO2 is greater than 800 ppm, the instrument volition start to alarm until the concentration is to a lesser degree 800 ppm.

Step out 3: Software

Connect Seeeduino XIAO to a computer by a typewrite-c cable, then the chicken LED of power should light up.

Now, undefendable the Arduino IDE and add the Seeeduino to Arduino IDE: Click "Files" > "Preferences", fill the "Boards Manager" URL with the tailing liaison:

https : //files.seeedstudio.com/arduino/package_seeeduino_boards_index.json

Click "Tools" > "Board" > "Boards Manager", search for keywords: "Seeeduino XIAO". You will see "Seeed SAMD Boards", install information technology.

After installed the boards, click "Tools" > "Circuit card", find "Seeeduino XIAO M0" and select it. Now, you have order the Seeeduino XIAO Arduino IDE plug-in.

Now open the curriculum provided by the attachment. Download the depository library files accordant to the cardinal links in the program.

Then click "Survey" > "Let in Library" > "Add .ZIP Library".

Select the zip data file you just downloaded. If the program library was installed correctly, you will see "Library added to the libraries. Check "include library" menu" in the notification window. This means that the library has been installed correctly.
From "Tools" select serial ports for the Arduino development instrument panel. Serial ports menu. This could be COM3 operating theatre a higher version (COM1 and COM2 are usually reserved for computer hardware serial ports). To find proscribed the answer, we can disconnect the Arduino development board and reopen the menu. The disappeared row should be the Arduino ontogenesis board. Reconnect the plug-in and select that serial port.

Now, click the "upload" button in the environment. Wait for some seconds, a message "Upload completed" will be shown on the status bar if the upload succeeds.

Few seconds after the uploading completed, you should be able to insure some information on the screen. Congratulations! You have launched and run the program. If you coming upon any problems, please do not waver to submit the issue to our meeting place.

Tone: When measuring the ambient carbon dioxide concentration, delight keep each measuring time up to 10 seconds and take the average value for multiple measurements. This will sacrifice a more true value.

In addition to the provided program, you can also customize new program logic and functions, such as opening to push the signal to the phone in real-time via the wireless module when the concentration is greater than a certain appreciate, or automatically opening doors and Windows by directly accessing a electrical relay, etc. I am real looking forward to your customs duty settings.

Just about references you may need:

https://wiki.seeedstudio.com/Seeeduino-XIAO/

https://wiki.seeedstudio.com/Seeeduino-XIAO-Expan...

https://wiki.seeedstudio.com/Seeeduino-XIAO/

https://github.com/olikraus/u8g2/wiki/u8x8referen...

Step 4: Structure

Let's switch to the social system section of this project. Since we are considering a portable hand-held device, we decided to make a infrared-temperature-gun-like shell for it.

You can regain the blueprint I victimized in the attachment and role a laser engraving car to engrave the wood panels to get the parts. So assemble the parts in order.

Additionally to pictures, a video is also available to watch to see how to assemble.

If everything goes wellspring, congratulations! You just get a handwriting-held device for sleuthing CO2 concentration. You are welcome to optimise this project, delight share your results with me if you care.

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