update readme
convert readme.org to README.md; add LICENSE
save schematic and pcb in kicad 6
A keyboard based on the Atreus, powered by an Atmega328 microcontroller. It uses the 44 key layout of the Keyboardio Atreus, rather than the 42 key original.
There are two 3d printed 'cases' to glue the keyswitches into, one for each side. They are drawn with OpenSCAD. In case.scad you can set the show = "layout" to see the finished layout, or printable_left or printable_right to export .stl files. (The .stl files are also in the repo.)
The KiCAD files for the pcb are in atmega328_board/. It is single-sided and fairly simple, so I acid-etched it. Since the Atmega328 doesn't have built-in USB, V-USB is used for software USB. As described here, USB data lines are expected to be max 3.6v, but the USB supplies power at 5v. I use the zener diode solution to clamp the voltage on the data lines.
How to Build a Custom Keyboard by Matt3o
A modern handwiring guide - stronger, cleaner, easier
USBaspLoader for the bootloader. In Makefile.inc set DEVICE = atmega328p and PROGRAMMER = -c usbtiny or whatever programmer you're using. In firmware/bootloader.cfg, set the pin numbers to match the pcb with #define USB_CFG_DMINUS_BIT 3 and #define JUMPER_BIT 5. Run make, hook up your programmer to the Atmega328, make flash, make fuse, and it should be ready for QMK.