How to Measure CO2 with a Low-Cost Sensor and a Raspberry Pi
joshefin.xyz
joshefin.xyz
An accurate CO2 sensor is much more expensive. I would not trust the readings of the sensor in this blog. It's going to be off by over 100ppm, especially if there's a lack of good airflow.
https://www.atlas-scientific.com/product_pages/probes/ezo-co...
It seems thoughtfully designed. I especially like the warnings in the beginning. Usually I prefer a higher density of information, but this is not too shabby.
For comparision - this is a datasheet of a temperature sensor device: http://pdf.datasheetcatalog.com/datasheet/maxim/DS18B20.pdf
Electrical characteristics, operation principles, state machines and so on, and it is suitable for printing.
EZO-CO2(tm) datasheet looks crazy.
page 3 is a big poster warning about submerging of the sensor
page 4 is a big poster warning about bright light interference
page 5 is a big poster warning about ground loops
1/3 of page 10 is a cartoon picture of a production line.
I believe that some of the more expensive sensors are more accurate, but this cheap one may be a good enough solution in some cases (e.g. indoor air monitoring for DIY projects).