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A report was flagged as "the battery got recharged" (resetting battery_history and stats_recharge_cycles, and re-arming the low-battery alert) whenever it came in >= RECHARGE_JUMP_PCT above the single immediately-previous report. That's exactly what a real recharge looks like, but it's also exactly what a normal reading looks like right after one noisy low report: e.g. 60, 59, 58, then a stray 53, then back to a perfectly normal 58 -- 58 >= 53+5 falsely read as a recharge. Now compared against the max of the last RECHARGE_LOOKBACK (3) reports instead of just the one before it, so a lone stray reading doesn't get to set the bar a normal reading then trips. A real recharge still needs to clear all of them, so genuine recharges are still caught immediately (verified: 18% -> 90% still triggers, history still resets). Paired with the firmware-side battery.c change (trimmed-mean ADC sampling) that reduces how often a stray reading like the 53 above happens in the first place.
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.