The esp mounted into the top of the device case and the co2 sensor to the side. Below is the pm25 sensor and the main board for the device is attached to the case front and ready to pop into position

Notices where this attachment appears

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

   in reply to

   @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.