My project recently went from needing <16 relays to needing 26. I already have a 16-relay ProXR controller board and a spare (both with USB communication) on order that should be arriving soon-ish.
Is it possible to make one of the relay controller boards act as an expansion board for the other relay board? And, if it doesn’t work like that, could I instead hook both controller boards up (via separate USB connections) to the same computer, and command each board individually? Or would they both report as the same serial port, and I would need to make one board a different type of communication, like ethernet?
I do intend to get actual relay expansion boards; these would just be a bandaid fix until the expansion boards are ordered and arrive.