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Green PCB with various small surface mounted components, an unmarked IC at the bottom, a small square ic marked JC BP0047J-5682 to the bottom right. Humidity and temperature sensors are hard to spot but the beeper is an obvious black circle the co2 is silver with mesh. There is a large empty area that has the footprint of an esp microcontroller but none of the power or data lines have components populated although there are pads. There is also an unused socket marked 5v, gnd, txd, rxd

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Green PCB with various small surface mounted components, an unmarked IC at the bottom, a small square ic marked JC BP0047J-5682 to the bottom right. Humidity and temperature sensors are hard to spot but the beeper is an obvious black circle the co2 is silver with mesh. There is a large empty area that has the footprint of an esp microcontroller but none of the power or data lines have components populated although there are pads. There is also an unused socket marked 5v, gnd, txd, rxd
https://mastodon.radio/system/media_attachments/files/112/235/154/068/325/156/original/e7424a0192d986f2.jpg

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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

In conversation Monday, 08-Apr-2024 19:52:12 JST from mastodon.radio permalink