See kamaji.cc for assembly instructions and additional information.

Directories:

• firmware: main source code;
• demo: code samples;
• 3d: OpenSCAD models for the enclosure;
• pcb: schematic and printed circuit board layout in KiCAD format;
• misc: the rest.

We use PlatformIO with Arduino framework. It should also be possible to compile the code with the official Arduino IDE.

For v1 and v3 custom fuses must be programmed before first flashing.

pio run -e v1 -t fuses

Select the correct board version (v1, v2, v3) and flash it with:

pio run -e v1 -t upload

The recommended version for new builds is "Classic V1".

• V1 uses an ATmega328p running at 8MHz without an external oscillator. USBasp can be used for programming.
• V2 uses ATmega32u4 and a 128x64 graphics screen.
• V3 runs on ATmega328p with a 16MHz oscillator and and utilizes a PCF8574 I/O extender chip.
• "Classic V1" is an updated revision of V1. Fully compatible from software point of view.
• "Headless" is a USB MIDI device without a screen or buttons. Built around "Pro Micro" boards (ATMega32U4).

Let's stick to Google C++ Style Guide.