zmk-steno-engine

Clean-room stenography engine for ZMK Firmware. Dictionary-based lookup with multi-stroke support, optimized for nRF52840 flash constraints.

Status: Early development — basic single/multi-stroke lookup works, formatter not yet implemented.

Features

• Standard 23-key steno layout
• Sorted-array dictionary with binary search lookup
• Multi-stroke support with configurable timeout
• All-up chord detection
• HID keyboard output (ASCII)
• Build-time dictionary compilation from Plover JSON
• Test dictionary included for development

Building

Add as a ZMK module in your west.yml:

manifest:
  remotes:
    - name: zmk-steno-engine
      url-base: https://github.com/afiqzudinhadi
  projects:
    - name: zmk-steno-engine
      remote: zmk-steno-engine
      revision: optimize-dict

Enable in your .conf:

CONFIG_STENO_ENGINE=y

Use in your keymap:

#include <dt-bindings/zmk/steno_keys.h>

/ {
    keymap {
        steno_layer {
            bindings = <
                &steno STENO_SL  &steno STENO_TL  &steno STENO_PL  ...
            >;
        };
    };
};

Dictionary Compiler

# Compile test dictionary
python3 tools/compile_simple.py dicts/test.json -o steno_dict.bin --stats

# Compile Plover dictionary (trimmed)
python3 tools/compile_simple.py plover-main.json -o steno_dict.bin --max-entries 120000 --stats

License

PolyForm Noncommercial 1.0.0