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Button Pad Hookup Guide - SparkFun Learn
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![4. Arduino Technical Details - Arduino: A Technical Reference [Book]](https://www.oreilly.com/api/v2/epubs/9781491934319/files/assets/aian_0408.png "4. Arduino Technical Details - Arduino: A Technical Reference [Book]")
4. Arduino Technical Details - Arduino: A Technical Reference [Book]
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