Welcome to my new post for my video on YouTube. In this one, I will show you how to make a humidifier.
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Text for the video:
Hi. In this video I will show you how to make a cheap air humidifier, aromatizer or mist maker. I will make a simple enclosure and show you a time-lapse of 3D printing it. If you do not have a 3D printer, you can use any other nice looking box, which can hold the liquid. Coming up!
Nowadays air aromatizers are very popular. In my country sellers are aware of it, so the prices start at 40€ and can reach up to 150€. For a simple piezo element which oscillates at certain frequency, that is to expensive. As a handyman I decided to make my own. At first I wanted to build the oscillator from scratch, but shortly afterwards I decided to buy the element and corresponding power supply as they cost around 7€. This is way cheaper then building one. You can find the link to a cheap but good seller in the description below or on my homepage. The one I have has a dry run protection. This means when the liquid evaporates, the machine stops.
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HOW DOES IT WORK?
The aromatizers work by oscillating the piezo element at certain frequency. Piezo element is a crystal between two conducting plates which deform under the voltage, so it makes the air or water above it vibrate. You may know them from sound playing greeting cards. It vibrates the liquid so that small micro droplets are formed. They are small enough to stay in the air in the form of mist. If you want to know more about piezo elements comment below.
Let’s see what I’ve received in the package. I’ll do the unpacking. I comes well packed. Declaration says it runs at 24V up to 0.6A which means 14.4W. Let’s open it. As you can see there is a round actuator with several color LEDs. I’ll loosen the cables. The altogether cable length seems to be long enough. Actuator diameter is a bit less then 5cm or 2 inches. The power adapter is declared to supply 24V 1A. All that said, let’s test it. It works. It makes magic mist and blows the water in the air. We will need a high enclosure.
DESIGN, ASSEMBLY, TESTING
I designed the enclosure in FreeCAD. We only need to measure a piezo element diameter. I will show you a glimpse of my design. You can find it on Thingiverse.com. The link is in the description below.
On the time-lapse you can see the first version. Here is its design in FreeCAD. There is an elevated edge above the overhangs in the lower cup for the top part. When finished the top cup was sunken in and the mist coming out was sparse. Both cups were designed in FreeCAD.
After testing I figured out the bottom cup edge should be at the same level as the overhangs. This yielded to the final version. Here you can see it. This way there is no water spraying and the mist coming out is thick. Another path I could have taken is to include a small fan, but this would have taken more parts and work. I am keen on making things easier. The final design has 3D printed bottom part which holds the glass above. Glass is transparent and it makes a prettier final product. This is the bottom part with overhangs for the top part and the bed for the piezo element.
So, let’s put the parts together. Put the element in and pull the cable through the hole and plug the rubber. You can use some silicone if you find it leaking. In the end push the element into its position. Now pour in some water and aroma and cover the bottom part with the glass. That is all.
Now let’s see how it works.
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Song in the background: Silent Partner – Digital Solitude, Topher Mohr and Alex Elena – Where I am From, YouTube Audio Library.