user24324: Electronics Newbie!!
I want to connect a USB cable to my Uno's GPIO pins (and then connect it to a USB port on my computer). I have chopped off a USB cable from a keyboard, I read this and I'm hoping that the wires will be in the correct order (the keyboard was made by Dell). I'm a little confused about which wires go where.

user4143: The reason you are confused about which wires go where is simply because the Uno has no connection on it for a USB cable's wires.
You cannot directly interface an Uno to a USB port without extra hardware.  What hardware you require depends on exactly what it is you think you are trying to achieve.
(There have been some attempts to create a USB device interface purely in software, but personally I wouldn't touch it with a barge pole - the GPIO of the Arduino is not electrically compatible with USB.)

24324: <p><strong>Electronics Newbie!!</strong></p>

<p>I want to connect a USB cable to my Uno's GPIO pins (and then connect it to a USB port on my computer). I have chopped off a USB cable from a keyboard, I read <a href="https://electronics.stackexchange.com/a/37066">this</a> and I'm hoping that the wires will be in the correct order (the keyboard was made by Dell). I'm a little confused about which wires go where.</p>
 4143: <p>The reason you are confused about which wires go where is simply because the Uno has no connection on it for a USB cable's wires.</p>

<p>You cannot directly interface an Uno to a USB port without extra hardware.  What hardware you require depends on exactly what it is you think you are trying to achieve.</p>

<p>(There have been some attempts to create a USB device interface purely in software, but personally I wouldn't touch it with a barge pole - the GPIO of the Arduino is not electrically compatible with USB.)</p>
