These are hard to find, At least I have not found them yet.
But there is a way to do it, i have use an old CO2 sensor that have a 0-10Vdc output signal that i have connect to a RFXsensor.
The RFXsensor have a A/D input that can measure this voltage and send it to the (in my case) Homeseer environment.
Herbus wrote:I suggest to messure CO. Messuring CO2 will give a lot of alarms
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