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I'm planning a thought project for measuring the C02 in a room (at office namely), and communicating its results to a computer.

But I'm blocked at the early stage: which sort of sensor and which is the mechanism to measure the CO2 concentration in air ?

I saw devices for sale, not communicating with computers, only LCD screens, and there were no indications on what is the system/mechanism used.

Any idea ?

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I have used NDIR sensors, such as these: http://www.alphasense.com/index.php/products/ndir-safety/

It's based on a light source which is flashed at a regular frequency and reflected on a series of mirrors before ending on a receiver. The sensor provides 2 signals: one "reference" signal, which remains constant regardless of the % of CO2, and one "active" signal which changes with the % of CO2 in the air. You have to calibrate the sensor with different % of CO2, and you can compensate for temperature and pressure variations.

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  • $\begingroup$ Great starting Point. I found several references to start with. $\endgroup$
    – Stephane Rolland
    Commented Sep 9, 2019 at 19:12

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