Thanks. I did see that, yet that does not help me. This is not a device I can put in every room. As far as I can see, we need to set a computer or a raspberry pi in every room, this is exactly what my partner does not want.
Or did I miss anything?
That’s it. I use these to monitor the air quality of my 3d printer enclosure to automatically control the exhaust fan. And I also have 1 in the room itself (aside from the enclosure) and it will send me a text message once a certain level is reached. The sensor only requires 1 signal wire. The ESP8266-01 is at 3.3V so it already matches the 3.3V requirement of the sensore for V-led. If you don’t have a 3.3V power supply, use a stepdown buck converter, or just a voltage regulator like LM1117.
So there you go, a good DIY for a WIFI-enabled air quality sensor for approx $5, which you can expand later on. ESP8266-01 has 4 ‘readily’ available GPIOs (0/2/rx/tx) which you can use. Of course, you can always solder directly onto the SOC if you need more pins
As far as aesthetics, I 3D print my own cases. If you don’t have one, just be creative. Put it behind a photo frame, or in a candle warmer (the one with both sides open). If you want to spend $$$$$, then yeah, just go with the suggestions above.