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jcl5m1 / ventilator

Low-Cost Open Source Ventilator or PAPR
MIT License
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Hairdryer + Arduino with a relay #37

Open kyrgyz-nlp opened 4 years ago

kyrgyz-nlp commented 4 years ago

I attached a tube to a hairdryer (with heating off) –– it seemed to work, meaning it blows really well. Planning to buy a relay for automation with Arduino. Do you think this kind of build would be more accessible to a broader audience? Also, I'll make the air go through a container with warm water to humidify it.

I'll be happy to hear back!

jcl5m1 commented 4 years ago

That's a really nice thing to try. I would recommend finding a way to measure the output pressure using the water level tube fixture, or a flow rate measurement. I suppose for air flow rate you could use a garbage bag to estimate Liters/min. Time how long it takes to fill the bag up?

Would recommend first try making a PAPR with it. https://github.com/jcl5m1/ventilator/wiki/Build-a-Low-Cost-PAPR

You can probably use a standard N95 face mask as a filter on the intake. If you do this, take a photo and describe your test results.

PatoZG commented 4 years ago

That’s a great idea, hairdryers offer good power output. Hairdryers usually employ AC motors, in order to modulate the fan speed a variable frequency drive is required. I recommend buying a solid state relay to modulate the speed using Pulse Width Modulation, which can be output from an Arduino DO pin. Here is a sample relay Register a new account on the Banggood APP and get $100 of coupons. I just found an amazing item with free shipping.https://banggood.app.link/iGvLLhSk84

chakahamilton commented 4 years ago

i recently explored the hairdryer idea. in order to get it to work on batteries, I just needed to break apart the circuit board on top of the motor, a simple full bridge rectifier. Once that was done im now running the dryer on my drill battery.

chakahamilton commented 4 years ago

I've tried the hair dryer will HEPA filter and its not strong enough to allow enough airflow to breathe.

iaankrynauw commented 4 years ago

@chakahamilton what was the wattage on your hairdryer?

If it is in the upper spectrum of normal hairdryers, is this then unfeasible?

Is the N95 mask still an option to use as a filter, will it let more air through?

chakahamilton commented 4 years ago

@chakahamilton what was the wattage on your hairdryer?

If it is in the upper spectrum of normal hairdryers, is this then unfeasible?

Is the N95 mask still an option to use as a filter, will it let more air through?

I use a 1875 watt hair dryer with a vacuum cleaner filter not (synthetic fiber) I'm currently testing two new designs you should follow the build PAPR thread #32 for progress updates.