In case it wasn't clear the first time: I would not even do that. Write a makefile, use your regular M-x recompile etc. bindings. Configure `make install` to up

In case it wasn't clear the first time: I would not even do that. Write a makefile, use your regular M-x recompile etc. bindings. Configure `make install` to upload it, so e.g `projectile-install-project` does the right thing. The more you treat "Arduino project" differently from any other project, the less sense it makes to be using Emacs instead of the Arduino IDE.