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One feature that has contributed to the Raspberry Pi's success is the possibility of interfacing the virtual (software) with the physical world. We are speaking of course of the "General Purpose Input and Output" pins, more commonly known as GPIO. They are available on the Pi at the P1 connector.
We are doing some green computing today! We are going to recycle some old computer cable and make a Raspberry Pi interface cable with it. We will then be able to connect motors, LEDs, buttons and other physical components.
The interface cable is a flat cable with 26 conductors. It is quite similar to an IDE hard disk cable (or ATA) with 40 conductors (avoid the ATA66/133 with 80 conductors):
