Chris AdamsI posted about air quality / indoor CO2 in rooms yesterday in #FOSDEM, and this project here appears to set up a fairly accurate in-room CO2 sensor (a SCD4x one) with a tiny ESP32 minicomputer.
The box can join wifi, and then expose the live CO2 values for scraping via Prometheus/Grafana, a well known monitoring/observability stack.
It even includes a 3D model for 3D printing the box, and sample code and links to buy the kit, for 30-40 EUR total.
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