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4. Arduino Technical Details - Arduino: A Technical Reference [Book]
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Arduino UNO R3 female pin headers spacing? - Projects - KiCad.info Forums
![4. Arduino Technical Details - Arduino: A Technical Reference [Book]](https://www.oreilly.com/library/view/arduino-a-technical/9781491934319/assets/aian_0414.png "4. Arduino Technical Details - Arduino: A Technical Reference [Book]")