I'm trying to develop a system that will monitor long term CO2 levels indoors and will run on a battery.
A lot of the conventional CO2 sensors are really power hungry and expensive. However, I came across this (http://www.ccmoss.com/gas-sensors) which claims it can measure 'equivalent CO2' in the environment where the main source of VOCs is from humans.
This seems great with a power consumption of <1mW, but it's £5.96 per sensor which is quite pricey!
Has anyone heard of anything similar, or have an idea of how 'equivalent CO2' is calculated so I could maybe use a cheaper VOC sensor and do the calculation myself?