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New third mode alongside photos/calendar: fetches a .whiteboard file over plain WebDAV (Basic auth -- generic, not Nextcloud-specific) and renders it via a small Node.js sidecar using Excalidraw's own real export code (@excalidraw/utils + @resvg/resvg-js, no headless browser), since a .whiteboard file turns out to be Excalidraw scene JSON, not an image. The sidecar runs as a second process inside this same container (Dockerfile installs Node, start.sh backgrounds it before exec'ing uvicorn) rather than a separate docker-compose service -- lightweight, stateless, reachable only at 127.0.0.1 from the Python process, nothing worth independently scaling. The rendered PNG is treated exactly like a photo from there on -- composed/quantized through the existing image_pipeline (letterboxed, never cropped) rather than a second parallel rendering pipeline. WebDAV credentials support the common "it's actually the same Nextcloud account as my CalDAV" case (an explicit opt-in checkbox, not silently inferred) while still working with any WebDAV server generically. Frame-level source (URL + owning account) follows the same owner- controls-their-own-data permission split as calendar sources and the week view's task list: only the account owner can point a frame at it, anyone linked can clear it. Honest limitation: this environment has no Node.js/npm, so render-service/ is written carefully against each library's documented API (verified via the npm registry, including transitive dependency licenses after the CalDAV/AGPL surprise earlier this session) but has never actually been executed. First real docker build is the first true test -- see render-service/README.md.
ESPresso Frame
A DIY e-ink photo frame: an ESP32-C6 pulls photos from your Immich library and displays them on a 7.3" full-color e-paper panel, waking on a timer to refresh and spending the rest of its time in deep sleep.
- No cables to a computer, no SD card shuffling. Provisioning is a captive portal with a QR code drawn on the panel itself -- scan, join, fill in your WiFi and server address, done.
- The frame never decodes an image. A small self-hosted server does all the work (pulling from Immich, cropping, dithering, packing into the panel's exact pixel format) and hands the device a stream it can write straight to SPI. The ESP32-C6 has no PSRAM and not much SRAM to spare -- keeping it a dumb display client is what makes that workable.
- Crops toward faces, not just the center, using face bounding boxes Immich already computed for its own People feature -- no bundled face detector.
- Refresh interval and album are configurable from a web UI, no reflashing needed to change them.
Hardware
- ESP32-C6 dev board (8MB flash)
- Waveshare 7.3" E Ink Spectra 6 (E6) panel -- 800x480, 6-color, SPI
See docs/hardware.md for wiring and
docs/architecture.md for how the two halves talk
to each other.
Getting started
server/-- run the FastAPI server first (Docker Compose, points at your Immich instance). Seeserver/README.md.firmware/-- build and flash the ESP32-C6, then scan the QR codes it draws on first boot to provision it. Seefirmware/README.md.
Repo layout
firmware/ ESP-IDF project for the ESP32-C6
server/ FastAPI server: Immich -> crop/dither/pack -> the frame
docs/ Wiring and architecture notes
License
MIT -- see LICENSE. A few small pieces of vendored
third-party code (a QR code generator, a bitmap font table) keep their
own permissive licenses; see LICENSE for details.
Built with substantial assistance from Claude Code.