That's what a schematic and DRC checking tool are for
this post was submitted on 03 Sep 2023
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Not that I'm aware of but the DRC systems should be able to make it pretty clear if there's track issues.
There are circuit / electrical simulators but that's a very complicated solution for keyboard designs that tend to be simplistic.
Matrix circuit designs are not much to be worried about. If you had a design in question I'm sure someone including myself would be willing to look at it.
Did you design a schematic or define nets using something like Ergogen? Schematics/Nets provide you with those little white lines defining, “These two pins should connect on the same circuit.” After you’ve traces all the routes to connect your components together, DRC will tell you if you missed a connection, or if two things are connected that shouldn’t be. It’ll also give you warnings like traces being too close to the edge of the board.
It was all by hand, so placing the switches, adding the nets, defining which pin was on which net, and then connecting all the dots.