3 ms·I got a MH-Z19 co2 sensor attached to an esp with esphome, works really well.by ysleepy 5y agoI got a MH-Z19 co2 sensor attached to an esp with esphome, works really well.logifail 5y agoFantastic tip, thanks! I have a dozen or so ESP32 boards littering my desk left over from a work project, so that sounds perfect :)ajmurmann 5y agoDoes it measure NO2 though?ysleepy 5y agoNope, only co2.