I'm working on a"little" project on home automation, and I'm going to wire the whole house up, ataching about 30 boards running arduino. I need to power up all these, so I have two options:
-Use directly the power of the outlets (240V AC in Europe), with one transformer per board -Use a pair of dedicated wires and just one big transformer. All the boards connected in parallel. I'm going to wire up the entire house anyway, so it wouldn't really matter, although I'd rather not use this.
The boards would be really simple: couple or relays, one or two sensors, and maybe one of them will have a fanvy LCD, but I can power up that one in another way, as long as it's just a couple of them.
I'd also accept any suggestion about the microcontrollers, maybe a cheaper or more power efficient one?
EDIT: it's a three story house, so considering that a main power transformer is located in the ground floor, and taking into account that I don't know how my house is wired, the farthest module from the big transformer might be about 50 meters away.