Hi guys!
I just started a project to allow Particle devices to easily control Arduino Nano pins over Serial. It’s a two part library, and is hosted on GitHub. https://github.com/nrobinson2000/nano-control
The purpose of the library is expand the number of usable pins on a Particle device by creating an easy-to-manipulate Arduino slave. It is called “nano-control” because it is intended to work on a Photon and a Nano.
I still haven’t tested it fully because I broke my last remaining Nano recently. I want to buy some more so that I can test the library.