I built your (pre traffic light) kit! It works great, and it has been enlightening to see indoor co2 and pm2 levels. It’s good to have something to quantify wh

I built your (pre traffic light) kit! It works great, and it has been enlightening to see indoor co2 and pm2 levels. It’s good to have something to quantify when a window needs to be opened to let in some fresh air. Here’s a picture of the finished product of the kit: https://www.paulsprogrammingnotes.com/generated/assets/images/air_quality_monitor_1-800-12084f20d.jpg https://www.paulsprogrammingnotes.com/generated/assets/image...