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Old 08-11-2011, 08:37 PM   #1
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Little IAQ project


Buying this house that was built in 2008. Well sealed. I never lived in a house like that before. Always lived in old drafty houses where I didn't worry much about the O2 etc.

Wondering if I'll need one of those automatic fresh air things. So I got a CO2 sensor on Ebay:

$50, not bad. Of course, it has no display or anything, just a low-voltage RS232 interface. Here's the poop sheet:

The low-voltage RS232 adaptors are very common. I have a couple of them in the junk, but if I had to buy one, this one would probably work:

It comes with a set of double-female pigtails. I should be able to just
plug them into the CO2 sensor's connector. Or solder to it, no big deal either. I'll mount the sensor and USB adapter in a little plastic minibox with an airhole in front.

I'll plug the thing into a Linux box and write a little Perl script to log the readings every 15 minutes or so. After a week, I'll know whether opening doors is enough to keep the air fresh, no guesswork.

- JerryK


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Old 08-11-2011, 08:47 PM   #2
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Not trying to be a jerk. If you are this worried about co2 then why not buy some houseplants?


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Old 08-11-2011, 09:25 PM   #3
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I don't think Jerry is worried about co2 except as an indicator of fresh air infiltration into the house. A stable co2 level of 1100ppm or less usually indicates enough ventilation to purge indoor pollutants. A low reading 500 to 700 ppm probably means too much ventilation(high energy bills).

Sounds like a cool project...co2meter sells a nice logger called aq100 that can log RH and temp as well.
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Old 08-13-2011, 05:42 AM   #4
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Place it in your bedroom, and see if your CO2 remains low enough over night, when the doors aren't being opened and closed.
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