4x2 macro keyboard with attiny85 based digispark.
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Arduino IDE and Digispark https://digistump.com/wiki/digispark/tutorials/connecting
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DigisparkKeyboardExtend library https://github.com/hsgw/DigisparkKeyboardExtend
Digispark is licensed under CC BY-SA 3.0 http://creativecommons.org/licenses/by-sa/3.0/
(c) Digistump
Remnant is licensed under CC BY-SA 3.0 http://creativecommons.org/licenses/by-sa/3.0/
(c) 2019, Takuya Urakawa, dm9records.com