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ROAD TO THE BOOK #3! This one is so much fun. In which we solder the countdown clock to a perma-proto; build a simple SAMD11 microcontroller board from scratch; and then power the one with the other. Next week: the protoboard moves to a Feather-shaped PCB. http://oddlyspecific.org/2020/03/05/road-to-book-3-prototyping-a-feather/

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