With regards to powering the remotes, has anyone ever notice that the pins on a cr2032 coin battery holder fit straight into the VIN and GND pins of a Nano, works a charm you just have to cut a small piece of the plastic away from the battery holder to allow for the reset button. I used a dremel for this, but was the only mod I had to do , the battery holder is almost designed for it otherwise. Not sure how long it will last though, depends what you load its up with as always.