this post was submitted on 04 Jul 2026
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Home Assistant

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Home Assistant is open source home automation that puts local control and privacy first. Powered by a worldwide community of tinkerers and DIY...

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I overengineered an air quality sensor because the commercial options didn't cut it for me. Custom PCB, open source hardware ;) (old.reddit.com)
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The original was posted on /r/homeassistant by /u/carloroepke on 2026-07-04 18:52:43+00:00.

I built a custom 4-layer PCB with SCD41, SGP41, SHT40 and BMP280, running ESPHome. Sensor fusion, air quality score, configurable thresholds, three isolated power rails. Making it public in case anyone wants to build one.

https://github.com/roepkefeller/air-quality-sensor

Usually I don't show my projects online (IP/industry stuff, the kind of hardware I am developing is pretty closed source..), so I'm very interested in some thoughts! If anyone builds this board please let me know haha. I'm also happy to answer some questions!

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