There exist inexpensive real co2 sensors, e.g. https://www.sparkfun.com/products/22396 . Datasheet says only updates every 5 seconds & 60s response time “for achieving 63% of a respective step function”, which I guess is what parent comment means by “They’ll likely be extremely slow”.
Probably worth searching e.g. digikey for sensors with faster response time.
There exist inexpensive real co2 sensors, e.g. https://www.sparkfun.com/products/22396 . Datasheet says only updates every 5 seconds & 60s response time “for achieving 63% of a respective step function”, which I guess is what parent comment means by “They’ll likely be extremely slow”.
Probably worth searching e.g. digikey for sensors with faster response time.