Four foundations first: the idea, the model, the controller image, and how releases reach you. Then the protocols, written from the controller's side, with what actually happened on the bench.
Each protocol note is edited from the prototype's own engineering record. Where the textbook and the bench disagreed, the bench is what is written down.
Each domain note starts from the outcome, names the real sensors and actuators that expose it locally, and shows the rules the controller runs.
Dissect the product, redesign it from first principles, publish the parts list and the wiring. Each design runs on Opichy and is released under a permissive hardware licence.
Wires to the 24 VAC valves already in your yard. Eight relays, a fused transformer, a rain sensor and a flow meter through optocouplers, soil probes if you want them. Sixteen line items, about $210, which is what the cloud unit costs.