“There's something satisfying about having mechanical outputs driven from digital inputs. The clunk of the relay sound giving a warm fuzzy feeling that the code actually worked for a change. I've got mine hooked up to a Ender 3D printer to cut power once it's cooled down, or if the temperatures go too high. The other one I bought toggles the Christmas lights on and off”
“Works well on the 5V side. Still need to wire it up on the high voltage. I acquired this to hook up my 3D printer and OctoPrint to switch the printer on and off.”
