runtimeprojects.com has a tutorial on how to install and use Arduino libraries.
Libraries are an essential part in the Arduino world. They are what makes Arduino so easy to use. Libraries are written to encapsulate complex functions and expose them as simple function calls to the user. For example to switch a pixel on and off in an LED monitor. This is relatively very complex but, fortunately some folks at Adafruit created a library that enables us to handle an LEd monitor with simple functions like, draw lines, text, circles, rectangles, etc… Normally these libraries include a readme file with some explanations about the various functions, and examples of how to use the library.
Mike is the founder and editor of Electronics-Lab.com, an electronics engineering community/news and project sharing platform. He studied Electronics and Physics and enjoys everything that has moving electrons and fun. His interests lying on solar cells, microcontrollers and switchmode power supplies. Feel free to reach him for feedback, random tips or just to say hello :-)
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