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Hello in my arduino code i simple want to include another file like this:

#include "letters.h"

but it says 

 error: letters.h: No such file or directory

the letters.h is definitely there, right next to the ino file from which i compile.

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You don't need to include, just call functions from another file. It handles for you.

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yep, but only if the other files also ends with .ino – clamp Feb 26 at 12:34
Arduino says that the programming language of platform is "Arduino Programming Language", not C or C++ (they gotta be kidding =) ). But it parses your .pde (or .ino) files to a .cpp file under temp folder of your OS. .h files may not be added. One possible way can be moving your header files to "ardunio include directory" and using angle brackets instead. But changing the file extension might be easier. – Onur Feb 26 at 12:59
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