Jack, W8TEE writes....? 19 April 2017
All:
First,
once you have a library installed properly, there is no reason to
delete it. Libraries are only loaded into a program when that library's
code is needed.?
Second,
I find it useful to install any newer version of the Arduino IDE in its
own directory. For example, I use drive E for all my programs, so the
latest release on my system is:
? ?E:\Arduino1.8.2
As
it is right now, I have 17 installed versions and can go back to
release 1.05 if I need to. In the past, hiccups in a new version allows
me to easily revert to the previous version.
If you have trouble installing libraries, keep these things in mind:
? ?1. Libraries need to be installed in the?libraries?subdirectory. For me, that means they must end up in:
? ? ???E:\Arduino1.8.2\libraries
? ?2. The new library name?MUST?share the same name as the *.h file in that library. Many new libraries are downloaded as a ZIP
?
? ? ?file and when installed you end up with something like
Rotary_master.ZIP expanding to a subdirectory named Rotary_master.?
? ? ? ?If you look inside Rotary_Master, you see:
? ? ? ? ? ? ? ? ? Examples ? ? ? ? ? ? ?// A subdirectory
? ? ? ? ? ? ? ? ? Keywords.txt ? ? ? ? // A file of keywords use for highlighting in the IDE
?? ? ? ? ? ? ? ?? README.md ? ? ? ?// Info about the library
?? ? ? ? ? ? ? ?? rotary.cpp ? ? ? ? ? ? // The C++ source code for the library
?? ? ? ? ? ? ? ?? rotary.h ? ? ? ? ? ? ? ? // The header file for the library
? ? ? Therefore, this library?MUST?be named?rotary?and be located as:
? ? ? ???? E:\Arduino1.8.2\libraries\rotary\Examples ? ? ? ? ? ? ?// A subdirectory
?
? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?Keywords.txt
? ? ? ? // A file of keywords use for highlighting in the IDE
? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?README.md ? ? ? ?// Info about the library
? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?rotary.cpp ? ? ? ? ? ? // The C++ source code for the library
? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?rotary.h ? ? ? ? ? ? ? ? // The header file for the library
? ?3. Any header file used in the program as: ?#include <rotary.h>?is going to look in the?E:\Arduino1.8.2\libraries?subdirectory for?
? ? ? ?that header file. If you use:?#include "rotary.h"?(note the quotes instead of brackets) in your code, it will look in the directory
?
? ? ?where the program's *.INO file is first to find that header file.
If it can't find it there, only then will it look in the default?libraries
? ? ? ?directory. Keep in mind that C is case-sensitive, so?<rotary.h>?is not the same as?<Rotary.h>?(note the uppercase 'R').
? ?4. Unfortunately, some new Arduino libraries that are functionally different "reuse" the same name of existing libraries. The
? ? ? ?Liquid_Crystal?library is an example. Sometimes you just have to experiment until you find the one you need.
Finally,
Release 1.8.2 of the IDE generates a lot of warning messages,
especially for libraries. As a general rule, if the IDE compiles and
uploads the code to your controller, you can ignore the warnings. If it
can't upload the program, there is an error rather than a warning and it
needs to be fixed.
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