default settings GPIO PA4 PA6 PA3 PB5

hc

2024-02-19 890e1df1bec891d9203724541e81f8fbe5183388

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- Original image: https://pixabay.com/en/fractal-digital-spiral-1231400/
  (Licensed under the terms of the Pixabay License: https://pixabay.com/en/service/license/)
 
- Modified by jdgleaver