For my graduation project I am looking for a (cheap) sensor which measures CO2 and humidity and someone mentioned it might be possible to measure the CO2-level using only an humidity sensor by using the formula: C6H12O6 (glucose) + 6 O2 => 12 H2O + 6 CO2 I am no chemic (nor a programmer), but I was wondering whether this would actually lead to usable values? And if it is also possible the other way around (measure H2O with a CO2-sensor)? The sensor will be used to measure indoor air quality and will provide tips for (manual) ventilation. I am a product designer so I will need to hire someone else to build this sensor for me, but before proceeding I was wondering about the above. Thanks in advance!