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CO2 sensor recommendation

koudelad

Hello,

 

I'd like to ask you for a CO2 sensor recommendation. My goal is to measure an air quality indoors (at home, office...) and take this as one of factors to control a ventilation. It is a hobby project to be installed at my home.

So far, I've found quite famous MQ-XX sensors, using various metal compounds. They are cheap (ca. €4), but need to be calibrated. Then I found quite a few Amphenol sensors, using IR light, priced ca. €150 - €350.

There are also volatile organic compounds (VOC) sensors, which provide output that correlates with CO2 level.

My requirements are: package solder-able at home (or a ready made module with a connector), some common interface (I2C for example), no need to calibrate the sensor.

 

Did you use any of the mentioned above in your projects?

 

Thank you, David

  • in reply to mrlvy

      wrote:

     

    it claims that CO2 levels over 0.5% (5000ppm) are deadly to humans at

    https://youtu.be/HutR7V0SVn8 &t=2:36

     

    Well, that's technically true I'm afraid. Levels beyond about 5000 ppm can be deadly.. depends what the narrator meant when he used the word about, and how you measure it surely, and on whom - I sure wouldn't want to test a sustained 5000 ppm on a baby, or where it peaked way beyond that, but the average was 5000 ppm.

    You're reading way too much into a marketing video.

    The products might or might not be bad, I don't know - but certainly your conclusion "WARNING: you might wanna stay away from senseair products!" makes no sense - no engineer that I know of would use a single marketing video to support that. Have you tested the products to back up your "warning"?