Nextion 3.2" TFT based scene controller with motion, co2, temp and hum sensors.
If the air quality is bad, the display will wake up and glow in a warning color according to the CO2 ppm.
The project is not finished yet and there is no guarantee it will be ever. :)
All parts are run from 3.3V except:
TFT display -> level shifter needed
power input for CO2 sensor (serial ttl is 3.3V)
Diary in the thread on https://forum.mysensors.org/topic/6416