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This directory is intended for project specific (private) libraries.PlatformIO will compile them to static libraries and link into executable file.The source code of each library should be placed in a an own separate directory("lib/your_library_name/[here are source files]").For example, see a structure of the following two libraries `Foo` and `Bar`:|--lib|  ||  |--Bar|  |  |--docs|  |  |--examples|  |  |--src|  |     |- Bar.c|  |     |- Bar.h|  |  |- library.json (optional, custom build options, etc) https://docs.platformio.org/page/librarymanager/config.html|  ||  |--Foo|  |  |- Foo.c|  |  |- Foo.h|  ||  |- README --> THIS FILE||- platformio.ini|--src   |- main.cand a contents of `src/main.c`:```#include <Foo.h>#include <Bar.h>int main (void){  ...}```PlatformIO Library Dependency Finder will find automatically dependentlibraries scanning project source files.More information about PlatformIO Library Dependency Finder- https://docs.platformio.org/page/librarymanager/ldf.html
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