Hi all, I worked with cyanobacteria during my PhD and know that CO2 monitoring is difficult and expensive. Sharing this paper attached that could perhaps help Amy.bo
https://www.sciencedirect.com/science/article/pii/S2468067225000276
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Brilliant - thanks Anton, that’s really interesting. I ordered an SCD41 CO2/temp/humidity sensor but never got round to installing it, as the day after I bought it, I learned that it takes days to drop back from saturation. It looks like the MH-Z16 they use in this paper would be worth the extra cost.
Infineon come out with some new CO2 sensors
and thought I’d give them a try, as they’re a bit cheaper than than the Sensirion ones and have both I2C and UART interfaces. They also have a supposed operating range of up to 32000 ppm.
It took about 6 minutes for one of these sensors to get back to baseline after I pointed a Sodastream cylinder at it:
I bought it as an evaluation kit so that I could just plug it into a computer and start playing around with it. If Adafruit doesn’t make a carrier board for it soon, I might design my own using the STEMMA QT form factor so that I can plug it into the Pioreactor.
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Nice graph - 6 minutes is definitely more useable, the ~£20 sensor price seems reasonable and a Labcrafter board sounds excellent.
Possibly worthy of a separate chat, but I notice they also mention H2 sensors (although I’m struggling to find a price or any stockists).