Ancestors

Written by blinry on 2025-02-02 at 11:33

I brought my CO2 sensor prototype to #FOSDEM!

In K.3.401 (a tightly-packed dev room with closed windows), I measured a CO2 concentration of over 3000 ppm.

For reference: Outside air is currently ~420 ppm, and a common suggestion is to ventilate rooms to <= 1000 ppm.

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Written by Abe Massry on 2025-02-03 at 16:16

@blinry what do you think about attaching a portable HEPA filter with a large battery to it? Have it auto turn on when the CO2 concentration goes above n. It of course wouldn’t turn off till it got some fresh air but it would be an audible indicator of the need for fresh air.

It would be like the size of those large water bottles people carry around and they would have to charge every night just like their phones. People like canister shaped objects, charging, & carrying things

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Written by blinry on 2025-02-03 at 18:18

@abemassry That sounds like the #airbib project @flauschzelle is working on! :) (A wearable version of what you're describing!)

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Toot

Written by Kiki on 2025-02-03 at 19:06

@blinry

@abemassry

With the bottle-like shape, it sounds more like e.g. the ToGoFilter.

But both that one and my AirBib (of which I should update the docs to reflect the current status -.-) have in common that they use a VOC sensor instead of CO2, because VOC can actually be reduced by filtering, unlike CO2 (and also VOC sensors are cheaper).

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Descendants

Written by Abe Massry on 2025-02-03 at 19:19

@flauschzelle @blinry I was thinking CO2 is a proximal indicator of pathogenic air and not a direct indicator, which the HEPA filter might help with.

I haven’t put in any actual work into developing it, so massive props to you. (Outside of researching for a product like this in the marketplace and finding none existed)

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Written by Kiki on 2025-02-03 at 19:55

@abemassry

@blinry

CO2 can be very useful as a proximal indicator of pathogenic air...if there are no filters running. Otherwise it can make the air appear more pathogenic than it actually is.

But a high CO2 level is of course even then still useful as a sign that the windows should be opened, because even without the pathogens, high CO2 will still make people tired and give them headaches :/

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