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A comment on On whether changes in bedroom CO2 levels affect sleep quality. Parent comment

Re:On whether changes in bedroom CO2 levels affect sleep qua... by tossandturn on Monday January 21, 2019 @02:22PM (#18962797)
I have developed custom Ethylene sensors in the past for customers, and Dynament (UK) is a manufacturer that I can definitely recommend if anyone wants to do this and go down the DIY electronics route without having to dig through a bunch of Chinese products to find the "right one". https://www.dynament.com/products/gas-sensors/standard-non-e...
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Re:On whether changes in bedroom CO2 levels affect sleep qua... by gnat on Monday January 21, 2019 @03:16PM (#18963240)
Cool! I worked at an ethylene-sensing IoT startup (fruit ripeness natch). What was the core sensor you used? (We were using off-the-shelf, but somewhat pricey, electrochemical sensors)
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Re:On whether changes in bedroom CO2 levels affect sleep qua... by tossandturn on Monday January 21, 2019 @05:01PM (#18964020)
"MSH-P/HC/NC/5/V/P/0 - 3% Volume Ethylene = 0.4V - 2.4V"

We built that into a custom SS body with a Delrin mounting insert, and ran the serial connections to a custom board that interfaced with up to 8x sensor locations (in conjunction with some other sensor elements). The elements were ~US$200/ea ~4.5 years ago.

These are fancy interpolated IR absorption sensors internally, so any gases of similar concentrations could throw off the readings; depends on the environment. Would be BEST to calibrate to local atmosphere conditions of the installation, but that's not really something you can sell. :P

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Re:On whether changes in bedroom CO2 levels affect sleep qua... by willsr on Monday January 21, 2019 @05:04PM (#18964041)
I remember looking into this years ago, and the prices were in the $100-$200 range for low volumes. Was this your experience?
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Re:On whether changes in bedroom CO2 levels affect sleep qua... by tossandturn on Monday January 21, 2019 @05:30PM (#18964245)
Yes
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