Not exactly schematics, but [Duckman] has some Arduino pinout diagrams he made using ASCII-art. These could be useful when pasted into source code as comments, documenting the pinouts for your ...

There should be no soft assets – including source code, diagrams, presentations, documents, etc. – that are not committed to the source control system. Third, pick a source control system.

From breaking down sprawling repositories into digestible chapters to generating diagrams that map ... maintaining unfamiliar code, collaborating on open source projects, or seeking inspiration ...