Wiring

[croce3]

Hello, since i've no idea on how to wire and i fear to make a mess, could you please post a more in-depth wiring diagram?
Thanks in advance.

[lizardbeans]

Hey, I'm not OP but I'll try to give you some wiring instructions.
From the Arduino there're pins for the buttons signal and for the LEDs energy (in simple words).
Each LED and Button have 2 metal connection points.
One of the is the signal and the other is a ground connection. Ground (a.k.a. common) can be a single wire that connects to each Ground metal connection.

You'll have something like this:

Button Signal ------ goes to--------> Button pin on the Arduino
Button Ground ------ goes to---------> Ground pin on the arduino

LED energy ----------goes to---------> LED pin on the arduino
LED Ground ----------goes to---------> Ground pin on the arduino

You can take multiple grounds and put them together like this:

Button Signal >>> Button Pin 1
LED energy>>>>>LED Pin 1
Button Signal >>> Button Pin 2
LED energy>>>>>LED Pin 2
Button Signal >>> Button Pin 3
LED energy>>>>>LED Pin 3

Button 1 Ground>>>
Button 2 Ground>>>>>>
Button 3 Ground>>>>>>>>>
LED 1 Ground>>>>>>>>>>>>>> A single Ground pin.
LED 2 Ground>>>>>>>>>>>
LED 3 Ground>>>>>>>>

Like this image