open source air purifier - indoor air purifier

by:Yovog     2019-07-06
open source air purifier  -  indoor air purifier
Hello everyone, I'm Ian Van murrick, a product designer from the Netherlands.
This construct is a brain kid I just shared with the world.
Poor air quality can lead to various health problems, and purification schemes are often complex and expensive.
The solution is open source no nonsense air purifier: open air!
This is based on my first prototype of an open-air experiment.
It aims to be a platform for building and improving.
My personal goal is to test and improve the design and effectiveness.
Together, we can offer new and better solutions.
The modular filter design makes it possible to change and test different types of filters.
This design is based on a carbon type filter that works with two pressure-optimized 120mm 12 v PC fans.
It is controlled by Arduino with gas sensors and LED panels for subtle visual feedback.
If you decide to build your own open source air purifier, get ready to roll up your sleeves as it's not easy.
It will include laser cutting, 3D printing, prototyping, welding, programming and many other parts and bobs.
This will be a high-level note.
But don't let it scare you because its rewards are big and big!
It's as big as thousands of cubic meters of fresh and pure air. Good luck! 1. Housing2. Electronics3.
Total cost of air filter: € 70 starts first with a wood frame cut by laser, making all the components in the open air.
Unfortunately I don't have a laser cutter:.
But fortunately, there is a lab nearby: stazrabrotterdam.
I used 3 layer Birch slices of 3mm, the birch slices are very soft and cheap, very suitable for laser cutting.
The speed and power setting of the laser cutting machine depends on the type of wood and machine you use.
If you are not sure, please ask the FABLAB team for help.
You need a top and a bottom, 22 regular ribs, 1 wood rib with a gas sensor cut-out, 1 plexiglass rib for LED and several assembly tools.
For the LED rib, I used a 3mm clear blue plexiglass, which I roughly polished in the vertical direction.
The transparent plexiglass spreads by rough machining to light it up.
Experience it!
After cutting, check everything with quick test fit, don't glue!
I highly recommend covering the wood with some kind of varnish or paint to prevent the wood from warping over time.
So, sand it down and do whatever you want.
I made an old and dirty finish with heavy duty varnish.
The printing time is about 24 hours, with a total of 4 printed parts.
The coupler of the 120mm fan, the coupler of the filer and the filter itself are all printed in the same direction in the same settings.
Depending on the printer, the tolerances on the tread may be a bit too tight and some sanding may be required to make it fit.
All the holes in the M3 Bolt should be their owntapping.
The open air is completely autonomous.
It has a gas sensor measuring air quality and an LED panel for visual feedback.
My PCB and code do this so there are 3 options: clean air: Fan and LED off.
Dirty air: The fan rotates near the client (
Speed can be adjusted with 1 k Ohm variable resistance)
The LED breathe slowly with upward movement.
Total air: The fan accelerates to the maximum, and the breathing speed is fast when the LED moves up.
The basic setup of the PCB consists of two relays for fan speed.
One is direct 12 v at full speed and the other is guided by a variable resistor.
In order to provide a 5 v power supply to Aruino while using a 12 v power supply, I used several voltage regulators.
This creates a 5 v rail for Arduino and sensors, creating a 12 v rail and a public ground rail for the fan.
The 5 3mm LED can be glued to the cut-out of the plexiglass.
All LEDs have the same ground wire and the positive side will be connected to the Arduino PWM output port.
Connect to the Arduino pin via resistor.
From top to bottom.
The resistance varies depending on the thickness of the organic glass in which the LED must be illuminated.
For maximum convenience and customisation, all external devices are connected via connectors.
The MQ sensor is not exactly the same and requires calibration.
Place the sensor near or ideally outside the fresh air, waiting to reach the minimum.
This is the value of clean air and you can change the value in the code accordingly.
The code is filled with instructions to make it easy to understand where the settings are changed.
Components are divided into two parts due to many pictures.
Make sure all parts are made, painted and ready before starting assembly!
Assembly Step 1: Fan first you should assemble the fan assembly with 2 120mm fans, wooden top, double fan connector, fan to filter connector and filter housing.
Double check the flow direction of the fan and they need to blow the air up.
The 8 M4 40mm bolt is what you need and the bolt can be sewn directly onto the plastic.
Since 3D printing will never be completely flat, you may need to tighten the bolts a little and the remaining gap between the fan and the printed part can be covered with tape.
Assembly Step 2: align the height of the wooden top at the top of the complete fan assembly has been set.
All you need to do is align the bottom by putting in 3 ribs and use the assembly tool to check the angle of the ribs.
If you want to be sure you can put a few more ribs, check the whole shape, but don't stick them together, just spray.
Assembly Step 3: it is important to leave at least 9 slots in the position where the sensor holes are located for easy installation of electronic devices.
Now put a special rib with sensor cutouts and plexiglass ribs on one side.
Starting with 3 ribs in triangular form like the previous step, before touching any glue, check the alignment of the bottom and the angle of these 3 ribs three times with the assembly tool.
I would suggest fixing these 3 ribs temporarily with adhesive tape and then starting to glue the ribs in place with wood glue.
Assembly Step 4: electronic board.
The electronic board can be installed in the holes already printed in the fan connector.
You should use the smallest gasket you can find if you want, because the tolerance of the ribs is very tight.
PRO tip: If the hole on the electronic board is not aligned with the hole on the printed part, just like attached to me. .
Take a small screwdriver and a lighter and heat the screwdriver until it is good and hot and then continue to rotate the screwdriver while slowly pressing it to the printed part.
Look, this is a perfect hole. you can put a bolt in.
Please keep in mind that you do not go through the printed parts entirely and that 10mm bolts should be used.
Assembly Step 5: finish first, let's finish all the wiring.
The fan can be connected and the power plug printing can be pasted in place after welding the wires and connectors.
Now is the time for the last final test to check if the whole system and all the electronics are working properly.
If all goes well, you can start to glue the last rib in place.
I would suggest starting with connecting the LED rib and placing it in place, and next I should place the special wooden rib with the cut-outs of the sensor and fan wires.
The next step is to put the remaining 7 ribs in place and prosper.
The main component is complete! !
After assembly, the filter housing can be screwed off from the bottom of the open air.
The trick to using a 12 v PC fan is not to limit the air by making the filter dense.
Don't overdo it, otherwise there won't be enough airflow to have a significant impact on air quality.
Air will be used through 3 types of media to remove dust and toxins from the air.
The fine dust filter on the outer side of the fine dust filter housing is the first filter encountered by air, which will remove dust particles from the air.
These filters can usually be purchased in large stores in the home section. 2.
Of course, there are many shapes and forms of activated carbon grid activated carbon, it may be a strange project.
The simple solution is to use activated carbon for fish tanks!
Cheap and easy to find, it works as well as an air purifier.
So go to the nearest pet shop or search the internet for the largest activated carbon particles.
The bigger the grain, the better the airflow! 3.
Activated carbon sponge is also a product made for fish tanks, which is very effective as an air filtration medium.
The best thing about these sponges is that they are good and strong, so they can be used as covers, so the activated carbon mesh does not fall off the filter housing.
Look for a square sponge of at least 8 by 8 centimeters, cut roughly round so it can fit comfortably inside the filter housing.
Layer Design is a good baseline as I have shown.
But you can build your own filter.
It would be great if you walked so far and congratulated yourself on the open air!
I hope you do like the building and you have learned something new in the process.
In small and medium sized rooms like office space, bedroom and living room, the open air is the best fit.
I would like to say that all rooms have a maximum of 35 square meters, otherwise a certain amount of cleaning must be maintained.
Used in large rooms, you can put the open air aside and blow a breeze of fresh air to you.
Open air using activated carbon filters will significantly improve air quality and remove all unwanted odors and toxins from the air.
However, activated carbon works like a sponge and is saturated over time.
This means that you should replace the activated carbon every once in a while like every few months.
For instructions on replacing the filter, check step 5.
There is always a need for improvement, and this project is no exception.
Due to lack of skills and time, I am unable to achieve the following improvements: PWM fans controlled by gas sensor values.
Small control panel for manual override buttons.
Overall size of electronic products.
Better sensor layout.
NOCTUA NF-F12 fans.
Different filter designs, such as: Apex dust chamber, UV sterilization, dehumidifier, HEPA filter, etc, if everything goes well in the next time, I will test the effectiveness of this carbon filter with previous UV filter designs.
Of course, the results will be shared!
I really appreciate all the time and effort you put into reading, making or improving this manual!
I really hope you guys are now more aware of the problem with indoor air quality and you are now a small part of the solution.
So share this insturctable and your results and improvements.
We can make changes together!
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