A bigger black plastic box is wired to the PCB using yellow wires. The display shows "6034 ppm".

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   blinry (blinry@chaos.social)'s status on Monday, 10-Mar-2025 03:40:31 JST blinry

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   I was too curious about whether the CO2 sensor itself would work, and wired it up temporarily.

   And it immediately did what it should, which makes me really happy! \o/ It really is a tiny CO2 sensor now! 🐣

   (Yes, I breathed on it for testing in this photo! :P)