The PCBs, a larger rectangle is the insides of the IKEA thing, it has convenient breakout pads, plus and esp8266 mini and the co2 sensor board

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   Christopher M0YNG (m0yng@mastodon.radio)'s status on Wednesday, 10-Apr-2024 00:47:30 JST Christopher M0YNG

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   @guysoft @g7vkq the IKEA thing has helpful breakout pads for power and data so you can easily add an esp8266. I use esphome which knows how to talk to both sensors. The co2 is an scd41.
   It all sort of shoves into the case with some hot glue.
   Sends data to home assistant, both pm25 and co2 plus temperature and humidity.