Fantastic work David! Looks like you solved it!
Are you able to provide any details about how you got it working?
Personally, I have had some troubles. For example, the sketch hosted on GitHub (arduino_gpio_controller.ino) requires an Arduino library to compile. The “simple_stream_based.h” file also on GitHub would seem to be library, but from my understanding of Aruino libraries, there also needs to be a .cpp file, and both of them need to be contained in a .zip file for the IDE to accept it as a valid library. There are a few .cpp files scattered through the GitHub tools file structure, but none are called “simple_strean_based.cpp” so which if any are associated with the .h file? Or does none of this even make sense??
Also, what is the wiring you have going into the Arduino? On the topic that is always referenced when this topic comes up, the Arduino is not actually used, rather a Numato GPIO module. Your photos look like you have both! Are they separate devices? Or did you need both to get it working?
I am happy to do a full how-to and publish it here if I can get it working.
Thanks!