# COVID-19 "Healthy-Indoors-Project"

**URL:** <https://discourse.nodered.org/t/covid-19-healthy-indoors-project/32942>\
**Category:** Share Your Projects\
**Created:** [16 September 2020 06:04 UTC](https://discourse.nodered.org/t/covid-19-healthy-indoors-project/32942 "2020-09-16T06:04:52Z")\
**Posts on this page:** 1\
**Showing post:** 11

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**Author:** ![Christian-Me](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/christian-me/32/10774_2.png) [@Christian-Me](https://discourse.nodered.org/u/Christian-Me)\
**Post date:** [17 September 2020 13:51 UTC](https://discourse.nodered.org/t/covid-19-healthy-indoors-project/32942/11 "2020-09-17T13:51:28Z")

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Hi Julian,  
yes actually you planted the seed a decade ago: [New bathroom ideas](https://discourse.nodered.org/t/new-bathroom-ideas/19980/91)

I know the limitation of a BME680 and I believe the eCO2 figure is more a marketing stunt. The BME has it’s origin from the automotive industry (as they mention in the video a couple of times) and certainly not a scientific sensor for CO2. In my car these sensors start the ventilation if they recognize a **increase** of the compounds these kind of sensor measure (mixed gas sensors).

And this is (as I think) exactly what it is necessary these days. We currently do not measure the climate change (even if I sometimes think it would be good to be able to focus on more than one problem at a time)

Perhaps to outline the project (I know and understand ... TL;DR)

- currently the indication of "relative" air quality is crucial. Against absolute values you might can’t do anything (Smog, pollution) through ventilation.
- cheap sensors easy to implement (prefer i2c insted of 5v modbus & level shifters & more code: ie. sensair S8)
- visualize a "relative" value - that`s why I made the neopixel monitor node... no values to discuss. or charts without a grid / values
- VOC values goes up immediately when people enter a room and after a short period (5-10s) these liquid based compounds reach the other corner of the room! If you think aerosols are a thing that is scary. I think (but will find out soon) that CO2 levels go up much slower
- check which sensors work best.
- and finally build something yourself!

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