DIY CO2 incubator

[Pieter]

About a week ago we organized a workshop to discuss our meat culture. Now there's a video on YouTube summarizing the event: https://www.youtube.com/watch?v=OBJMa2LEc-Y

It was a 10 hour event full of food, experiments, talks, videos and intense debates about meat. Thanks to the help of many contributors: http://waag.org/en/event/other-dinner

Now I am looking to extend the In Vitro Meat part, but I am having some difficulty with the CO2 incubation, but I am not so much an expert on gas flows. Has anyone tried to build one themselves before or know of any build instructions?

[Nathan McCorkle]

I've searched a lot on this, you want to get one of these, don't waste
your time with $5 or $10 sensors, they're too sensitive to humidity
and other gas changes:
http://www.co2meter.com/products/k-30-co2-sensor-module

THen you just need a 2-way valve and a gas regulator and CO2 cylinder,
all of that will be available from any soda/beer distributor. The
valves they have may not be microcontroller power level compatible
(i.e. the solenoid is 12V or 24V or something) so you'll likely need a
MOSFET or relay so the micro can actuate based on sensor readings.
Luckily for non-reactive gasses/liquids these valves are pretty cheap.

http://www.ebay.com/itm/New-Electric-Solenoid-1-4-Brass-Valve-Air-Water-Gas-Etc-12v-DC-Volt-NPT-/111135813629?pt=LH_DefaultDomain_0&hash=item19e035effd

http://www.ebay.com/itm/New-Electric-Solenoid-1-4-Plastic-Valve-Air-Water-Gas-12V-DC-Volt-NPT-NC-/121154250036?pt=LH_DefaultDomain_0&hash=item1c355b2534

http://www.ebay.com/itm/CO2-magnetic-Valve-Solenoid-Valve-Night-Time-Cut-Off-For-Aquarium-220V-/310828115616?pt=LH_DefaultDomain_0&hash=item485ecca6a0

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--
-Nathan

[Pieter]

Thanks Nathan, I was already looking into the cheap sensors, but figured there must be a reason why there are so few. It's incredible how many crappy "fresh air monitors" are being sold.

Anyhow, I'll build a small test setup. Aiming for 5% and see if it works.