> For the complete documentation index, see [llms.txt](https://www.clomads.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://www.clomads.com/concepts/origami/design-reference.md).

# 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](http://blog.julianhartline.com/archives/64)
* Adafruit Itsy 32u4 Board Schematic - Accessed Jan 13, 2018 [Link](https://learn.adafruit.com/assets/49818)
* Adafruit ATMega32u4 Breakout Board Tutorial Download Page (includes Eagle PCB files) - Accessed Jan. 13, 2018 [Link](https://learn.adafruit.com/atmega32u4-breakout/design)
* NumberOne's 32u4 uBBB schematic on Hackaday (micro/ultra Bare Bones Board) - Accessed Jan. 13, 2018 [Link](https://cdn.hackaday.io/images/7383101437163354862.png)
* Microchip's complete datasheet for ATMega32u4 - Accessed Jan. 13, 2018 [Link](http://ww1.microchip.com/downloads/en/DeviceDoc/Atmel-7766-8-bit-AVR-ATmega16U4-32U4_Datasheet.pdf)
* Example of layout and capacitor use for ATMega8u2 on AVRFreaks [Link](http://www.avrfreaks.net/forum/capacitors-32u4)
* Discussion on decoupling capacitors on Vcc pins of ATMega32u4 [Link](http://www.avrfreaks.net/forum/which-decoupling-caps-atmega32u4)