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  • Nice answer. One most important topic, though, didn't became clear to me yet: why everybody says "you are probably best off to follow normal practice: .h + .cpp"? Why is it better? Why the probably part? And most important: how can I don't do it, that is, have both interface and implementation (thas is, the whole class code) in the same, single .cpp file? Thank you very much for now! :o) Commented Jul 6, 2015 at 11:55
  • Added another couple of paragraphs to answer why "probably" you should have separate files. Commented Jul 6, 2015 at 21:06
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    How do you not do it? Just put them all together as illustrated in my answer, however you may find that the preprocessor works against you. Some perfectly valid C++ class definitions fail if they are put in the main .ino file. Commented Jul 6, 2015 at 21:07
  • They also will fail if you include a .H file in two of your .cpp files and that .h file contains code, which is a common habit of some. Its open source, just fix it yourself. If you are not comfortable doing that, you probably shouldn't be using open source. Beautiful explanation @Nick Gammon, better than anything I have seen so far. Commented Jul 6, 2015 at 22:37
  • @Spiked3 Is not so much a matter of choosing what I'm most comfortable with, for now, it is a matter of knowing what's available for me to choose from in the first place. How could I make a sensible choice if I don't even know what my options are, and why each option is the way it is? Like I said, I have no previous experience with C++, and it looks like C++ in Arduino might require extra care, as shown in this very answer. But I'm sure eventually I'm getting a grasp of it and get my stuff done without reinventing the wheel (at least I hope so) :) Commented Jul 7, 2015 at 12:34