Hello,
I want to use the BME688 sensor in a sauna to monitor the air quality and CO2 concentration.
The main aim is to know when the CO2 concentration gets too high and when I should bring fresh air into the room.
The BME688 is rated to work up to 85degC so I placed the sensor inside the sauna itself.
Outside the sauna I have another CO2 sensor, rated 60degC only, with a small airpump that bring air from the sauna and acts as a reference.
To simulate people in the sauna, I use a CO2 cannister from which I release some gas from time to time.
Right now the CO2 equivalent I am measuring with the BME688 seems totally off and very much influenced by the temperature and humidity. I do not see any correlation with the actual CO2 level that I am measuring with my other sensor.
I add some graphs of some measurements I have been doing.
I also have a BME688 evaluation kit and I tried to use the BME AI software to train an algorithm to detect CO2 from different sample set I recorded.
Unfortunately the gas estimate I was measuring was stuck at 33% and barely not changing, no matter what is going on in the sauna.
My questions are:
- How sensitive to temperature and humidity is the BME688 sensor?
- Can we measure pure CO2 with this sensor? Or does the CO2 equivalent is calculated from human breath only?
- Is this sensor useable at all for my use case?
I am using the BSEC library version 2.2.0.0 and use lower power mode (LP) for the sample rate.
Cheers.
