Download Libraries Arduino

To install a new library into your Arduino IDE you can use the Library Manager (available from IDE version 1.6.2).Open the IDE and click to the "Sketch" menu and then Include Library > Manage Libraries.

Then the Library Manager will open and you will find a list of libraries that are already installed or ready for installation. In this example we will install the Bridge library. Scroll the list to find it, click on it, then select the version of the library you want to install. Sometimes only one version of the library is available. If the version selection menu does not appear, don't worry: it is normal.

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Finally click on install and wait for the IDE to install the new library. Downloading may take time depending on your connection speed.Once it has finished, an Installed tag should appear next to the Bridge library. You can close the library manager.

Libraries are often distributed as a ZIP file or folder. The name of the folder is the name of the library. Inside the folder will be a .cpp file, a .h file and often a keywords.txt file, examples folder, and other files required by the library. Starting with version 1.0.5, you can install 3rd party libraries in the IDE. Do not unzip the downloaded library, leave it as is.

Return to the Sketch > Include Library menu. menu. You should now see the library at the bottom of the drop-down menu. It is ready to be used in your sketch.The zip file will have been expanded in the libraries folder in your Arduino sketches directory.

When you want to add a library manually, you need to download it as a ZIP file, expand it and put in the proper directory. The ZIP file contains all you need, including usage examples if the author has provided them. The library manager is designed to install this ZIP file automatically as explained in the former chapter, but there are cases where you may want to perform the installation process manually and put the library in the libraries folder of your sketchbook by yourself.

Please note: Arduino libraries are managed in three different places: inside the IDE installation folder, inside the core folder and in the libraries folder inside your sketchbook. The way libraries are chosen during compilation is designed to allow the update of libraries present in the distribution. This means that placing a library in the "libraries" folder in your sketchbook overrides the other libraries versions.

The same happens for the libraries present in additional cores installations. It is also important to note that the version of the library you put in your sketchbook may be lower than the one in the distribution or core folders, nevertheless it will be the one used during compilation. When you select a specific core for your board, the libraries present in the core's folder are used instead of the same libraries present in the IDE distribution folder.

Last, but not least important is the way the Arduino Software (IDE) upgrades itself: all the files in Programs/Arduino (or the folder where you installed the IDE) are deleted and a new folder is created with fresh content.This is why we recommend that you only install libraries to the sketchbook folder so they are not deleted during the Arduino IDE update process.

The Arduino environment can be extended through the use of libraries, just like most programming platforms. Libraries provide extra functionality for use in sketches, e.g. working with hardware or manipulating data. To use a library in a sketch, select it from Sketch > Import Library.

A number of libraries come installed with the IDE, but you can also download or create your own. See these instructions for details on installing libraries. There is also a tutorial on writing your own libraries. See the API Style Guide for information on making a good Arduino-style API for your library.

To use an existing library in a sketch simply go to the Sketch menu, choose "Import Library", and pick from the libraries available. This will insert an #include statement at the top of the sketch for each header (.h) file in the library's folder. These statements make the public functions and constants defined by the library available to your sketch. They also signal the Arduino environment to link that library's code with your sketch when it is compiled or uploaded.

Note: for users of versions previous to 0017, libraries belong in a subdirectory of the Arduino application directory: ARDUINO/lib/targets/libraries. For version 0017, the libraries directory was moved to make them more convenient to install and use.

Because libraries are uploaded to the board with your sketch, they increase the amount of space used by the ATmega8 on the board. See the FAQ for an explanation of various memory limitations and tips on reducing program size. If a sketch no longer needs a library, simply delete its #include statements from the top of your code. This will stop the Arduino IDE from linking the library with your sketch and decrease the amount of space used on the Arduino board.

To get started writing libraries, download this test library. It should provide a basic template for creating a new library. After you've made changes to your library, in order to get it to recompile, you will have to delete the .o file generated in the library's directory.

Ok I am a complete newb so I apologize for this quesiton but... I can not figure out where I am suppose to store Libraries on the Mac so I can call them up. The only folder I have is an "Arduino" folder under documents with nothing inside of it. Thanks for the help in advance.

The 0017 install just gave me the USB drivers and the arduino.app application. None of the environment support folders were there. I've been hunting down new bootloaders, etc. but why doesn't the new install put those support directories in the arduino folder any more? Where should I be getting all of that useful stuff? There is no "installer" per-se, the DMG file just has the application in it.

OK, I looked again. None of those support directories are in the 0017 package. I had no problems adding libraries, the docs explained that pretty well and it worked right away, but I'm trying to put a bootloader on my MEGA328p board, but nothing was there...

In my opinion all the source files/libaries should be removed from the Mac OS X bundle to begin with. End-users should never have to "show package contents" of an app to install or change files especially when there are many replacement sources/libraries for the default files included within the arduino app.

All those source files should be placed in a new Arduino folder located at "User's home folder"/Library/Application Support/Arduino. To avoid requiring an installer app to place those files there the Arduino IDE could simply copy the folders/source files in the app bundle to that location on startup if they are not already there. You would also want a menu option in the Arduino IDE to be able to select which arduino "default" libraries you want to use, i.e.:

Some details would still need to be worked out but that is the general ideas. It would still keep it exactly the same simplicity for users who don't know anything about this but also allow for more advanced users to easily make modifications that don't have to be redone with every arduino update.

Select the Arduino application

Chose 'Show package Contents' - a new window will appear.

Now navigate to:-

Contents

Resources

Java

Hardware

Libraries

And there you will find all the standard libraries.

You can install extra libraries here but that is not the preferred place.

Your optionally installed libs live at "C:\Users\userName\Documents\Arduino\libraries" plain and simple. The rest of the built-in lib code is in the Arduino Core (pretty much the installation folder - kinda).

Those are two of the three. You got mixed up on the sketchbook libraries and sort of listed that one twice. The sketchbook libraries are installed to the libraries subfolder of your sketchbook folder. The sketchbook folder is shown/configured in the Arduino IDE's File > Preferences > Skectchbook location setting. With (3), you seem to be implying that libraries can be placed in a libraries subfolder of a sketch folder, but this is not supported.

The third location is the libraries subfolder of the currently selected board's platform. Location will depend on if you're using a hardware core bundled with the IDE, installed via Boards Manager, or manually installed to {sketchbook folder}/hardware. The best way to find it is to do:

As I said above, the sketchbook location can be modified in your preferences. However, when the Arduino IDE is running in normal mode, the preferences are stored under your user folder. The way to work around that is to run the Arduino IDE in portable mode:

Windows 10 is very restrictive of the C:\Program Files and C:\Program Files (x86) folders, so you should use the "Windows ZIP file for non admin install" version of the Arduino IDE and install it to a location outside of those folders.

After this, the preferences will be stored under the portable folder of the Arduino IDE, thus every user will share the same preferences and the same sketchbook location. By default, when running in portable mode, the sketchbook will be located under the portable folder, meaning it could be lost when you update the IDE if you didn't remember to move the portable folder first. However, you can change the sketchbook folder location in File > Preferences to somewhere safe.

Yes, but there have been some reports of this making the IDE slow or not start if the drive is offline. I'm not sure exactly what the conditions are or whether it's restricted to specific IDE versions, but it's something to keep in mind in case you end up having problems after doing that.

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