Help please with Co2 project
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Re: Help please with Co2 project

by timv1 on Sat Apr 19, 2014 9:30 am

Concerning the monitoring of the CO2 I'll share an idea for displaying it.
Wanted to keep it all inside an outlet that could be used to power a solenoid connected to the CO2 tank. Due to space limitations I decided on using a little OLED. Although Adafruit sells a lot here as well as great libraries to interface them (kudos to "Lady Ada" and the amount of work she puts into things like that) I decided to make up my own. A place like OshPark can make you up a board SUPER inexpensive if you're interested in such things.

Anyhow, here are some pictures of the what I did to get the little OLED into the outlet. Since 3 is the limit I'll ad the other 2 in the next message.
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Re: Help please with Co2 project

by timv1 on Sat Apr 19, 2014 9:34 am

here's the rest of the pics. Also I should mention that I see an advantage in doing it yourself using something like the arduino because it gives you flexibility to not inject during periods of low photosynthesis as well as periodically as it does take a while for injected CO2 to disperse within a room due to airflow and the fact that it's heavier than air and has a tendency to settle.

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Re: Help please with Co2 project

by timv1 on Sat Apr 19, 2014 9:53 am

BTW, I just used a TQFP form factor of an Atmel chip so I could get it and the rest of the circuitry inside the outlet, but one could also use an arduino, https://www.adafruit.com/search?q=arduino or one of the other boards they sell here and then feed it into the outlet to the OLED or just a display like they sell here, "http://www.adafruit.com/search?q=oled" mounted somewhere.

If you're new here, be sure to check out all the new things that they add all the time and the online videos they do weekly.

Good luck, and have fun!
Last edited by timv1 on Mon Apr 21, 2014 7:23 am, edited 1 time in total.
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Re: Help please with Co2 project

by maltesemanTS on Sat Apr 19, 2014 11:32 am

Nice!
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Re: Help please with Co2 project

by adafruit_support_mike on Sat Apr 19, 2014 7:37 pm

That's a truly neat hack!

For reference, was that originally an outlet with a built-in switch?
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Re: Help please with Co2 project

by timv1 on Sat Apr 19, 2014 9:02 pm

Thanks Mike. Yes, it was an outlet on the bottom switched at the top. I got it at home depot.
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Re: Help please with Co2 project

by adafruit_support_mike on Sat Apr 19, 2014 9:26 pm

Cool.. I'll have to keep an eye out for those next time I invent an excuse to go to the hardware store.
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Re: Help please with Co2 project

by rgarito on Sun Apr 20, 2014 12:15 pm

Really cool! This looks like a KickStarter waiting to happen!
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Re: Help please with Co2 project

by timv1 on Sun Apr 20, 2014 8:56 pm

Hopefully this will be used only to help inspire imaginative thinking of those who have seen it - as was intended - and help promote the use of some of the Adafruit products in doing so, since after all this is their space where it's been shared.
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Re: Help please with Co2 project

by Andy the Engineer on Wed May 07, 2014 10:58 pm

That C02 sensor board has a trip-point pot (potentiometer) to adjust the desired CO2 trigger level.

What you need ot do is replace that pot wtih a digital-pot which is what would then be controlled by a microprocessor so you can use up/down switches to set the desired CO2 trip point. The relative position (value) of the digital pot can be displayed so you can see what value you're setting it to, but calibration to actual CO2 readings is something you'd have to do by trial-and-error or by calibrating against an off-the-shelf CO2 level sensor product.

Estimated time for R&D for this is 4 weeks, at a cost of $10,000.
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