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Replying to @josecastillo

admittedly I had a big assist from Adafruit here; the L21 Feather is _very_ similar to the Feather M0 Basic. The pinout is mostly the same, which should keep things simple; all the differences have to do with three analog pins. CC-BY-SA design files here: https://github.com/joeycastillo/feather_low_energy

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