Me and my dad were been looking for making small Pi to bigger Pi out of old PC case from 2004. So I thought that I need power button to power Pi but it's in the PC case so I took those but then i don't know how power Pi so I gone online and I looked how to add power switch to RPI2 but it turns out that it only found as RPI1 and that's not what I need but GPIO headers on RPI1 has less plugs and it uses power from here and I don't have power button that requires micro USB on the button heres a pic. So tell me how i can power RPI2 like this But if this is not correct then tell me with a picture and with text on comments below
Personally, this is my favorite method of shutting down my Rpi2.
Essentially it allows you to shut down your pi with a paper clip, or another conductive object.
You could probably modify this to work with a button.
Basically, you touch to GPIO headers and the pi runs the shutdown command.
Pretty cool if you ask me...Not as elegant as a button but it still works.