Instead of injecting CO2 via the yeast extractor I would like to utilize a CO2 tank & regulator. There are some fairly expensive solutions for this from Atlas, but since the logic and sensors are already present in the PFC, I would like to just use those. This would function almost identically to the way the humidifier works. When CO2 level gets below set level, the spare AC relay will turn on which would open up the regulated gas into the chamber. When the level gets to the set level, the relay would kick off, stopping gas flow.
Here's the regulator, on/off is controlled by standard 110v ac.
I'm going to attempt to code this myself, feel free to follow along!