Hey,
thanks for the support!
The project went forward quite a bit since the last beta. I've just updated the online version to the second beta, which now includes default node values, better UI, and the possibility to add nodes already connected to one another by dragging the connector.
I believe it's now possible to do basic projects with the actual system. I'll post some examples either here on another system soon.
EDIT : I burned the alim of an arduino due to a badly plugged resistor, I'll double check the cicuitery before trying it next time (it was a project I already made so I wanted to do it quick... 
)
Once again, I'll be happy to read about any suggestions, important missing features or issues either here or on the github page.