Rpi expansion boards

On the Raspberry Pi, there are several connections which can be used for expansion:
 * The Rpi GPIO (General Purpose Input/Output) pins are exposed, that means that expansion boards are able to talk directly to the CPU.
 * The DSI connector will allow low-level interfacing with LCDs and other displays.
 * The CSI connector will allow camera modules to be added in future.

GertBoard

 * main page: Rpi Gertboard

This board is a buffer between your Rpi and the real world, use it to flash LEDs on and off, drive motors, run sensors and all that other fun stuff.