Is there a way to calibrate the carbonDoser? I see an issue with that if you can't. All sensors drift in value. You could be dialed to 30ppm but you might get +- 10ppm. That's a problem.
I use this CO2 sensor. https://www.co2meter.com/collections...0-3-co2-sensor
It's self calibrating to the lowest value, which is atmospheric CO2. So when you want to calibrate it, you take it outside or blow atmospheric air into it.
You'd have to program your own micro controller like an Arduino or ESP. Getting it wet is a major problem
I'm tempted to start a crowdfund to finish this project, if people are interested. I remember a project on Kickstarter that die.. https://www.kickstarter.com/projects...-for-aquariums