Preprocessor directives are an old secret. With the information given in this video, maybe you discover a new use for them? Even beginners can use them and save time or add comfort during programming.
This video will show you three areas of usage:

1. Flexible Debugging with debug levels
2. Same sketch for different microprocessors
3. Optional components

Links:
Sketches and DebugUtil folder: https://github.com/SensorsIot/Pre-Com...

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