Note: for users of versions previous to 0017, libraries belong in a subdirectory of the Arduino application directory: ARDUINO/lib/targets/libraries. It will then appear in the Sketch | Import Library menu in the Arduino IDE. The folder should contain a C or C++ file with your code and a header file with your function and variable declarations. To add your own library, create a new directory in the libraries directory with the name of your library. On Windows, it would be My Documents\Arduino\libraries\.
For example, on OSX, the new directory would be ~/Documents/Arduino/libraries/. User-created libraries as of version 0017 go in a subdirectory of your default sketch directory. They also signal the Arduino environment to link that library's code with your sketch when it is compiled or uploaded. These statements make the public functions and constants defined by the library available to your sketch. This will insert an #include statement at the top of the sketch for each header (.h) file in the library's folder. To use an existing library in a sketch simply go to the Sketch menu, choose 'Import Library', and pick from the libraries available. the ability to control an LED matrix, or read an encoder, etc.). cpp) which provide your sketches with extra functionality (e.g.
Libraries are files written in C or C++ (.c.
