Library adaptation MajicDesigns to read a matrix keyboard with 4017, up to 100 keys. cesars/4017-km
I’ve also tried embedding(link) a scheme in the help, and some useful links.
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Cool! How have you made this nice GIF live schematic? I wonder what software allows to do it.
Here it is 
, it will lack output to serial monitor, but it has the main components.
But then I record the video with oCam and convert it into gif in gfycat (copy it to @evgenykochetkov) 
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Well it seems that Patreon SimulIDE_0.3.12-RC2 is more complete