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Yes, I've got my DIY one working with Home Assistant. It is just running on an ESP32 so you can load a configuration to it via ESPHome [1].

[1] https://github.com/ajfriesen/esphome-AirGradient

Achim from AirGradient here. Yes all our monitors [1] work nicely with Home Assistant. Especially via ESPHome [2].

[1] https://www.airgradient.com/indoor/

[2] https://www.airgradient.com/integrations/home-assistant-esp-...

HA has made it really easy to flash the esp chip. You just plug the chip directly into your computer for the initial flash. After that you can do it remotely.

There's this bit in the description:

https://www.airgradient.com/indoor/#:~:text=The%20AirGradien....

I run several self built Air Gradients on ESPHome and they do not connect to the cloud - or any external service. Works well with HA. Rock solid for 2+ years. I have to reboot them every 6-9mo or so if they “freeze”.

"Rock solid" and "have to reboot them every 6-9mo or so" seem pretty contradictory.