Post-merge bookkeeping so the next session's TODO is accurate. Next: M2
(WiFi manager + on-device REST API).
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Implements the first working feature: the device records audio to the microSD
card, toggled by the button, with LED status and per-recording JSON metadata.
What changed:
- firmware/src/audio.{h,cpp}: mic capture via the core-bundled ESP_I2S. Dev board
uses I2S standard mode (INMP441/ICS-43434); XIAO uses PDM mode (onboard mic).
Presents 16-bit PCM mono to callers regardless of board.
- firmware/src/storage.{h,cpp}: microSD on a dedicated HSPI bus + a streaming
WavWriter that writes a 44-byte PCM header and patches RIFF/data sizes on close;
plus sidecar JSON metadata writer.
- firmware/src/recorder.{h,cpp}: idle/recording state machine; creates
/recordings/<id>.wav, pumps mic chunks in on update(), finalises + writes
<id>.json (Recording schema from api/openapi.yaml) on stop.
- firmware/src/ux.{h,cpp}: debounced button (short press toggles) + status LED
patterns (idle/recording/error), active-low aware.
- firmware/src/main.cpp: wires ux + recorder; loop toggles on button and drains
the mic while recording.
- firmware/include/audio_config.h: 16 kHz mono 16-bit, chunk size, rec dir.
- firmware/include/pins.h: added XIAO PDM mic + onboard SD pins, LED active-low flag.
- state/: TODO, ARCHITECTURE, NOTES updated for M1 and the deferred follow-ups.
Why:
- Recording is the foundation every later milestone (transfer, upload, transcription)
builds on. Kept dependency-free (only core-bundled ESP_I2S + SD) for simple CI builds.
Notes:
- Not compiled locally (no PlatformIO on the dev host) or hardware-verified; Forgejo
Actions CI builds both board profiles. Follow-ups tracked in state/TODO.md:
INMP441 16-bit level calibration, and real NTP timestamps (ids are uptime-based
until M2 brings WiFi/NTP).
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Bootstrap of the project (M0). Sets up the monorepo, design docs, hardware BOM,
the open API contract, component skeletons, licensing and CI, following the
Default Workflow SOP.
What changed:
- CLAUDE.md + docs/: copied the Default Workflow so sessions load the SOP.
- state/: PROJECT, ARCHITECTURE, DECISIONS, TODO, NOTES filled in for OpenScribe.
ARCHITECTURE captures the four-part design (firmware, server, app, case) and the
three sync paths; DECISIONS records the hardware, AI-stack, storage, app and
licensing choices; TODO lays out milestones M1-M9.
- hardware/BOM.md: two build options (compact XIAO ESP32-S3 Sense; dev ESP32-S3 +
I2S mic + SD), wiring/pinout, indicative cost.
- api/openapi.yaml: the completely open API (device + server surfaces), including
recording list/download/delete and exports (wav/ogg/txt/srt/vtt/md/json).
- firmware/: PlatformIO ESP32-S3 project, two board profiles, pin map, boot scaffold
with module seams for M1-M4.
- server/: FastAPI skeleton mirroring the OpenAPI, config for self-hosted MinIO,
faster-whisper and Ollama; stub routes browsable at /docs.
- app/, case/: Flutter app plan; parametric OpenSCAD enclosure.
- Licensing: GPL-3.0 (code), CERN-OHL-S-2.0 (hardware), CC-BY-SA-4.0 (case/docs),
REUSE-style LICENSES/ with SPDX headers; LICENSING.md explains the split.
- CI: Forgejo Actions workflow builds firmware (both profiles) and lints/imports server.
Why:
- Everything self-hosted and openly licensed per the user's requirements: an open
API, three sync paths (BLE control, WiFi transfer, independent WiFi upload on
charge to generic cloud storage), and a full self-hosted transcription+summary stack.
Notes:
- No custom PCB in v1; off-the-shelf modules. Physical verification waits on parts.
- Component code is stubs at M0; features land milestone by milestone, each as its
own branch/PR per the workflow.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
