where to get this cable?

bertus

Joined Apr 5, 2008
20,649
Hello,

As far as I can tell, the black wires connect the GND connections of the boards.
Just connect all the points of the black wires together.

Bertus
 

dl324

Joined Mar 30, 2015
11,223
Is there any limit how many points can be connected together?
In theory, no.

Practically, it depends on the current flowing through the wires. Wires have resistance, so there's a limit to the current they can carry and there will be a voltage drop in the wires. This isn't an issue with sufficiently low currents and/or sufficiently low resistance connections.

Nothing in electronics is ever as simple as you'd like it to be.

EDIT: If whoever drew that wiring diagram had given it a little more thought, it could have been drawn more along the lines of this to minimize wire crossings and routing length:
clipimage.jpg
 
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