Source and header file split

It is sometimes complicated to split the header and the source file, here are some hints:

The header MUST contain what is necessary from the outside of the source file.
The header SHOULD NOT contain, what is not necessary.
- There is no reason to pollute the namespace of the whole project.
- Keeping the interface small and as clean as possible will make team work simpler.
The header file MUST prevent multiple inclusion
A header file SHOULD be complete (it defines or includes all it needs).
- Example, if you use a uint32_t parameter in a function, the header should include <stdint.h>
A header file SHOULD not include files only used in source file
The header SHOULD be commented enough so there is no need to open the source file.
The source file MUST include the header
- This will ensure constistency

Temperature sensor example

Here is a simple main :

#include <stdio.h>
#