this gives a schematic diagram, but does not say anything on how to program the module. It seems similar to arduberry by dexter industries. I mean, you guys made the thing, you HAD to have someone there set it up, hook it up to a banana pi, program it and say, this works great, now lets sell them. So what was their process in doing so? I can program it using an arduino as the programmer, but that defeats the purpose of having the add-on module. The manual/datasheet you sent tells me how it is wired (sort of, it isnt accurate).
so my questions still stand unanswered:
How do you program it? Is there an example?
How do the two boards communicate? Is there and example?
Where is the documentation?
This comes from the document in the link you sent:
3D printer controller
Laser cutter controller
So, do you have any examples of any of these?
Did you program it from the Arduino IDE?
If not, how did you program it?
Just a minute amount of documentation and examples open up this product to an audience that is larger by 10 fold. I would personally write up a tutorial or getting started manual, if I could get the information I asked for in the first place.
it has ATmega328. its basically a little arduino that attaches to the pi across a 26 pin gpio header. (or 40).