Hi, I wanted to know how you are able to connect two separate ground wires into one ground pin, assuming the other 2(out of the three ground pins of an arduino Uno) are taken.
And without a breadboard, I really want to avoid using a breadboard. So just in essence a ‘normal(?)’ connection between the wires and the pin.
Would I use connect the two ground wires to a Y adaptor and then connect it to the pin, or is there another way?
Thanks
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This thread has tons of good info.
If you tell us why you don't want to use a breadboard (aka the standard way to set up experimental circuits), we could probably make better suggestions than if we just guess.
I’d like to know how the wiring of the circuit would ACTUALLY look like , ie not experimental. So something more ‘professional(?)’ I guess you could say. In other words I see the breadboard as a bit too prototype-y and I want to know how the wiring would look like, let’s say of a product that was on shelves. Hopefully that gives you an idea?
Thanks I’ll check it out!
In professional environments, you'd just use a printed circuit board (PCB). A PCB trace can easily connect any number of points through a single trace.
The kind of wiring which LarryD proposes is certainly useful for hobbyists or prototypes but not exactly something you'd see in anything mass-produced these days. Dupont pin headers exist pretty much only for the purpose of prototyping, and the kind of Y-wiring he proposes in post #7 is tough to automate - so a professional design would just have two soldering pads connected to ground on the PCB, and solder one wire each to either of those pads (if these wires are even necessary at all, and can't just be replaced by a PCB trace).
(PCBs are pretty affordable for hobbyists too, these days, but printing PCBs requires a finished design so you'd usually only create them once you've developed and tested your circuitry on a breadboard, a perfboard and / or in a simulation.)
Just as likely using a UNO which does not fit into a breadboard. A Nano does and is the preferred form.
Even better, a Nano with a "sensor shield" - no end of ground, supply and I/O pins.
That would be soldered. 
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