Design Reference
Input Sibling Boards
Design references for researching our 32u4-based input boards. Blogs, schematics, datasheets and CAD files
Julian Hartline's "Designing and Building an Arduino-Compatible PCB" - Accessed Jan. 13, 2018 Link
Adafruit Itsy 32u4 Board Schematic - Accessed Jan 13, 2018 Link
Adafruit ATMega32u4 Breakout Board Tutorial Download Page (includes Eagle PCB files) - Accessed Jan. 13, 2018 Link
NumberOne's 32u4 uBBB schematic on Hackaday (micro/ultra Bare Bones Board) - Accessed Jan. 13, 2018 Link
Microchip's complete datasheet for ATMega32u4 - Accessed Jan. 13, 2018 Link
Example of layout and capacitor use for ATMega8u2 on AVRFreaks Link
Discussion on decoupling capacitors on Vcc pins of ATMega32u4 Link
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