Very cool

Thanks Benny. I'm knee deep in the Arduino and have spent enough on kits, shields, and components that I could have upgraded to an NCE wireless system. This is really fun though. In particular this description caught my eye:

Wireless built-in. A built-in Li-PO charger next please

Neil Erickson 

Kind of cool

This is built for a specific purpose and as built does not provide access to all the Arduino I/O pins, but maybe enough for the purpose of a wireless transmitter/receiver of DCC.

...

Internal Wireless...how about that...

Hear that, DCC?  When are the decoders going wireless?!

NCE

The NCE DSR is perfect for wireless DCC and is compatible with Tam Valley and CVP throttles. I wish other manufacture's would catch on so the price might drop!

Neil

Wireless DCC

I believe Wireless DCC decoders are already here with Blue Rail and the Dead Rail systems.

As for the "Internal Wireless" just to be clear that is provided by the little additional green board you see in the above picture, the arduino portion is on the red board and visible here:

As this board is built for a specific application you only have 2 Analog Input pins available and maybe 3 Digital I/O pins according to the schematic.  Read the full description here:  http://johan.kanflo.com/the-aaduino/

I went back to Johan's github repository (where I had looked at the schematic the other day) and this time looked at his demo sketch. In that sketch he only uses two analog pins for reading temperature sensors and one digital pin as an output for an activity LED. I went back to the schematic and noticed that two of the digital I/O pins are also labeled RXI and TXO, which are the receive/transmit serial pins for programming the arduino/atmel 328 chip. The wireless radio link is for transmitting the temperature data to a remote location, so looks like this won't be useful for a DCC receiver.

BTW if you are into electronics in general you might want to peruse the rest of Johan's site, he has a wi-fi enabled camera, and an IoT device.