# Changelog

All notable changes to this project are documented here.
The format follows [Keep a Changelog](https://keepachangelog.com/en/1.1.0/).

## [1.0.0] - 2026-10-19

First public release of the ESP32-C3 CO₂ & environment sensor board (prototype v1).

### Added

- **Hardware design** (KiCad 10): schematic, 2-layer board layout, custom symbol
  library (`esp_sensair_stuff.kicad_sym`) and footprint library
  (`esp_sensair_stuff.pretty/`) for the ESP32-C3 module, Sensirion S8 and BME280.
- Project-local library tables (`fp-lib-table`, `sym-lib-table`) so the design
  opens with all custom parts resolved on a fresh clone.
- **Fabrication data** in `gerber/`: Gerber X2 plot, Excellon PTH/NPTH drills,
  Gerber job/stackup file, and a ready-to-upload `esp-sensair.zip`.
- **Bill of materials** (`bom/esp-sensair-bom.csv`) plus the human-readable BOM
  in the README.
- **Documentation** in `docs/`: schematic PDF, top/bottom layer plots, 3D render.
- **Firmware** (`firmware/`): ESPHome configuration and secrets templates
  (`*.example`) for the ESP32-C3 (esp-idf), BME280 over I²C and Sensirion S8
  over UART, with Home Assistant API (noise encryption) and OTA.
- **Licensing**: CERN-OHL-S-2.0 for hardware (`LICENSE`), MIT for firmware, BOM
  and docs (`LICENSE.MIT`).
- `.gitignore` covering KiCad local history/backups/lock files, ESPHome build
  artifacts, live firmware credentials, and OS/editor noise.

### Known issues

See the "Known issues and lessons learned (v1 → v2)" section of the
[README](README.md). Highlights: power delivered through the module's USB-C 5 V
path, single decoupling capacitor, no mounting holes, no populated I²C pull-ups,
unannotated schematic, leaded HASL, and a `+` in the project name that leaks
into Gerber file names.