Project with multiple source code files

As per title, is it possible to have a "sketch" containing multiple source files?

Yes. Look top/right in the IDE and you will see a down arrow (at least you will in Windows). The drop down allow you to add a new tab to the project which will create a new file in your sketch directory. If you add .ino files to the directory manually by copying them in they will each appear on their own tab in the IDE.

There have been a number of recent threads on this subject such as Arduino - How to split project in multiple file - Programming Questions - Arduino Forum

Thanks. I now know how to do it: leave the main file blank - that has seemed to work.

akis_t:
Thanks. I now know how to do it: leave the main file blank - that has seemed to work.

It is not necessary to leave the main file blank.

...R