On the right-hand side of the board is a six-pin header for connecting to the Raspberry Pi via serial. The pins are spaced to fit directly over the center-line ditch of a standard breadboard and provide easy access to the GPIO pins on the Raspberry Pi. This connects using a 40 pin ribbon cable directly to a breadboard. To make things easier, we've developed the Pi Wedge breakout board. To connect an LED to these pins, you can use a Male to Female jumper wire to connect to a breadboard, but it's often difficult to count or recall which pin is which.
Not all pins are used and not all pins are in order. The standard Raspberry Pi Model B, and B+ have a 2x20 pin connector that provides access to connections you can use to turn on LEDs, read button presses, spin motors, and more! These pins are often referred to as General Purpose Input \ Output (GPIO) Pins.
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