To whom it may concern. I just finished my new CO2 sensor which can be connected to Homey with HomeyDuino. It is based on the Sensirion SCD40 and has a build-in webserver as well as an MQTT client which can connect to Home Assistant and Domoticz via autodiscovery. The RGB LED turns green, orange or red depending on the CO2 level. By default Auto Self Calibration is enabled but it can also be force-calibrated with any reference value. I am still comparing the results with the SenseAir S8 but so far the values are quite similar.
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