I'm looking for something like... a remote control that runs at 230V (to be put in a normal wall button set) and that transmit a RF signal to an Arduino pin @5V (through a receiver, of course), to make it execute commands inside an house. Does something like that exist? :)
Hi Explain a little more detail about your project requirements please, because if your physically pressing a wall switch then your defeating the object of remote/radio control.
Theirs many methods that already exist for home automation, but generally you will have a low voltage (5v) controlling a larger voltage (220vac) usually through a relay but how you switch that relay ie physically or via a radio signal is up to you.