I am really trying to get this thing dialed in. I want to make sure everything is right before I put the cart before the horse. But overall it isn't a hard thing. Just a bunch of I/O signals that the Arudino will translate to temps and send those signals to wifi to whatever device that can interpret that info. Just trying to gather the correct parts before the build. Won't cost that much really since most of the shields are relatively cheap. If it were to become something big then I would get volume pricing to bring down the cost. Or build in-house.