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Purely a server-side decision: GET /frame/config hands back a longer refresh_interval_s while quiet hours are in effect (exactly the seconds until they end), and clamps the normal interval so the device's next wake lands at the boundary instead of wandering into the window, when outside it but approaching. A device already mid-sleep when quiet hours begin can still land one wake inside the window -- unavoidable without touching the firmware, since it has no wall-clock awareness -- but from that wake on it sleeps straight through to the end. Window is "HH:MM"-"HH:MM", wrap-past-midnight aware (e.g. 22:00-07:00), in the server's local timezone -- added tzdata to the Dockerfile since python:3.12-slim doesn't include it and TZ would otherwise silently resolve to nothing and fall back to UTC. Also fixed the "overdue" device-status check to account for quiet hours: without this it would falsely flag a device sleeping through a long quiet window as unreachable.
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.