My latest video shows how easy it is to set up a couple of RS485 modules connected with two wires and an Arduino µController at either end so you can communicate with an outbuilding, shed or workshop, without using radio waves.
Even better is that you can connect several RS485 modules to the same two wires, so one for the shed and one for the barn, for example.
Did I say “easy”? Well, why did it take me 3 hours to get a very simple couple of sketches running then? Watch the video to find out!