• @sexy_peach@feddit.de
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      fedilink
      12 years ago

      https://www.heise.de/select/make/2020/5/2022015381334973804 (german language)

      Some german people build these with a ESP8266 board and a CO2-Sensor. What it does is change a light from green to yellow and red according to the CO2 amount in the air. This was supposed to be used to know when open a window to get fresh air and not have high virus concentration. I think I read that with the delta and omicron variant ventilation isn’t even that important anymore because infection will still happen anyways.