hh, but I haven't tested this in the latest Arduino IDE. So you need to fix this.įolder foo.cpp and (optionally, but recommended, to show it is a C++ header file) foo.h -> foo.hh. hpp.Įnsure you put your custom header and source files in the same directory as your project.

Last I checked years ago, Arduino also prefers header files to end in. Your files are already fine in this regard. So, to include your own custom header files, you must:Įnsure all source files have the. How to properly include C/C++ headers and source files in your Arduino Project Quick summaryĪrduino is C++, with some C source code and object files mixed in, but they have added some preprocessing steps to their build system which make it behave slightly differently from normal C++. What I would expect to happened is a way to link the cpp folder without having to put all the files in the same root folder of the project. home/temporary/project/project.ino:9: undefined reference to `bar()'Ĭollect2: error: ld returned 1 exit status (Which I downloaded recently)Įrror /tmp/: In function `loop': But same as above, that setting does not exist in my ide. I looked at this but I do not have a setting for sketch/import library (however I do have sketch/include library, however I did not see anything close to using a custom folder location) When I try to compile the code using the Arduino IDE, it fails with error However while the header provides the prototype of the function, the function definition is in the cpp file. I have a #include 'folder/foo.h at the top of project.ino. I am trying to add a cpp file to arduino project that has the following setup.

Arduino wire cpp library