piecat

That's actually more impressive to me that is all in JS...

They took the money and built tollways

A lot of PPE used in hospitals in Covid areas also doesn't filter exhaled air. It's assumed that the air is dirty and infected and only the wearer needs to be kept safe.

I don't think that is true- masks with exhaust valves have been banned in the hospitals I've dealt with.

EE by trade at a medical devices company. (This comment is my own personal opinion).

I started out skeptical, but your work does look promising. The circuit board seems well designed, I think the design of the product looks great. Have some questions/feedback.

It looks like there is foam around the shield? (Or is it cloth?) How easy is this to clean?

Do you have any strategy for dealing with the E-waste of this product? The bulb contains mercury, and while it does meet RoHS, I'm curious how much thought has gone into this. Have you considered any UV LEDs?

Any sort of testing done with how fragile that bulb is? It would be bad if the bulb cracked and now you have a mercury cloud (and quartz dust) around your face.

How loud are the fans? Any dBA measurements? (It looks like the fans don't cover the ears?) Can you reasonably hold a conversation while wearing it, with others hearing you?

How does the UVC affect the material that is used in the bulb chamber? I know UVC is notorious for causing plastic to yellow/degrade/brittle. Are there any negative effects with this, for example, plastic decomposing and off-gassing? Any risk of aged plastic flaking off into airborne particulates?

Finally, the open-source aspect of this project feels lacking. There is no over-arching BOM. The CAD files are in Altium (Consider KiCAD to be more open-source friendly). The files are scattered about the website and it's hard to find any details. Presentation is important, and it really felt like a scam a-la solar roadways. It shouldn't be this hard to find details about an open source project.

Will the team move to close-source it once the concept is hashed out and manufacturers are interested? In other words, is it "open source" to generate hype and revenue, with the goal of going closed-source for profit? (Reddit comes to mind- used to be "open-source")

The amount generated by scraping something is trivial.

Majority comes from degradation in nature. Sun bleaching, ocean waves. Washing synthetics.