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Mindstorms kit extensions
Mindstorms kit is well prepared for extensions. Additional elements are sold by LEGO and other companies.
You can also prepare extensions by yourself.
LEGO publiced the whole documentation and source code of NXT Brick operation system.
Ready elements
By LEGO
Reach source of knowledge about Mindstorms kit extentions: LEGO Power Functions
Available elements:
Compass sensor,
Color sensor,
Accelerometer sensor,
Infrared seeker,
Gyroscopic sensor,
Infrared link sensor,
LEGO Camera.
By other companies
Own elements
NXT Prototype Board
NXT Prototype Board is a kit to building own sensors for NXT Mindstorms.
It can be also used as interface to connection of NXT with other devices.
LEGO protocol
LEGO byte code
More about extensions