I'm playing with a couple of ideas regarding digital sensors in my Skeeball machine and these Sharp Digital Distance Sensors
http://www.pololu.com/product/1134 are one option that I'm floating around. I've done a lot of reading and think I've got a basic understanding of wiring possibilities for these sensors, but I'm still not positive that I understand correctly. I've mocked up a couple of diagrams of circuits that I think would work.
First, here's what I think(?) is a functional parallel circuit:

On this circuit, would it also work to run each ground individually back to the LEDwiz GND instead of stringing them together? Is the above image technically a series circuit because the ground wires are all connected in a series?
Second, here's what I think(?) is a functional series circuit:

If both of these examples would actually work, would either of them be better than the other? My main concern is that I've really only wired LEDs and standard button switches... I've never wired anything that requires power that also has an output and it seemed strange to me to have both the voltage and the output share the same ground. I sincerely appreciate any help you guys could provide! Thanks in advance!