Display outside the case, showing 466 ppm co2, within a circle that flashes different colour segments to show the "danger range" Below shows 22°c and 49% humidity A purple 18650 cell is connected behind the PCB and the empty case is just out of shot.

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   Christopher M0YNG (m0yng@mastodon.radio)'s status on Monday, 08-Apr-2024 19:52:12 JST Christopher M0YNG

   Bought a cheap co2 monitor off eBay. The screen cover hides four screws, inside it looks suspiciously like there is space for an esp, although it's lacking the components to provide power and data. The pad marked 3v3 is 5v but the one marked vcc is 3.3v so could be tapped.
   The temperature and humidity sensors look pretty basic, not 100% on the co2 sensor
   There is no fan to draw air into the case
   The lithium cell's rating is hidden by the sticky pad.
   It doesn't seem to agree with my SCD4x sensor