src subdirectory

Projects Programming
2

If your sketch is structured like this:

TEST2
|_TEST2.ino
|_src
|_blah
|_blah.h
|_blah.cpp

Then the #include directive in TEST2.ino should look like this:

#include "src/blah/blah.h"

and the #include directive in blah.cpp should look like this:

#include "blah.h"

It doesn't matter what you have your sketchbook location set to, or whether the sketch is in the sketchbook.