Thanks for doing this project and sharing it. I am very interested in the Food Computer, but the more advanced project is beyond my abilities and my budget. This project is right sized for me.
My name is Dave, and I’m an amateur (ham) radio operator, holding a General class license. I have a Master’s degree in a non-STEM field.
I intend to build this project; most of my materials should be here within a few days. I don’t have a lot of experience with coding, but your instructions seem straight forward, so I hope to have no trouble. But I do have a couple of questions.
I’m considering a larger enclosure, using a metal shelving unit (purchased at home improvement stores for about $80) and four grow tubs instead of two. It would be roughly the same height and width, but about twice as long as your design. I’m also considering two sets of lights and two exhaust fans. I think the channel relay can easily handle the additional amperage, but I’m wondering if there would be any issues with the monitoring and controlling software if I increase the size of the enclosure.
I’m also considering using a central reservoir for the nutrient solution and using the ebb and flow (flood and drain) method to keep the tubs supplied. I’m wondering how difficult it would be to program the Raspberry Pi to activate the pump to occasionally refresh the solution in the tubs. I think two or three times daily refresh would probably be adequate.
I also found a couple of problems with the BOM, but they weren’t difficult to overcome. For example, the Bus Tub is out of stock, but a suitable substitute was available.
I haven’t had a “build something” project in a while. Thank you again for providing this opportunity.