Also the ethernet shield does not fit the Nano, so you would have to cook your own.
You could do it as simple as creating a RS485 "network" and have each Nano as a node on it.
You can get a simple serial (usb) to RS485 board for the controlling PC.
I don't trust wireless connections and ethernet around the house is much cheaper and easier.
I am a full time php programmer and i had my fair share of basic arduino sketches using sensors and leds. But using the ethernet shield is something new for me. Especially when it comes to serving json content as if it was a API. Is this even possible?
Ok now you got my attention.I am used to working with tcp/ip but not with 433 MHz wireless. How would such a setup look like? One arduino with both ethernet and 433 MHz module? Using the ethernet talking to a server and the wireless module to talk to the nodes?Any tips on the communication between de basestation and the nodes?
BTW there is an Arduino Forum specifically for Home Automation HERE: