Thanks to Tomaae’s financial support, I’ve got a device for measuring harmful substances in the air: JQ-300.
And now — a few days later — the beta version of the component for the Home Assistant smart home system is ready to integrate this device (as well as its younger brothers: JQ-200 and JQ-100).
Currently known bugs:
* In case of loss of communication with the device, the component falls into an endless cycle of errors. It is treated only by restarting the system.
Support topic on Home Assistant Community forum: https://community.home-assistant.io/t/jq-300-200-100-indoor-air-quality-meter/189098