First engineering source prerelease — 2026-10-22

My very first PCB project: an ESP32-C6 temperature/humidity sensor developed as compact and thermally isolated layouts from one shared electrical platform.

This first public release is an engineering source prerelease for review and reproduction. It is not fabrication approval, a tested physical prototype, or a qualified product.

Source checkpoint: aaa5db3ede24c54f5a96b9b793e4cab32fdc7381 on master.

Included work

• Shared KiCad schematic, two generated PCB layouts and parametric enclosures.
• Reviewed local regulator/charger supply paths, regulator controls and connector mounting grounds.
• Ordinary via/paste separation guards, with the U4 exposed-pad assembly-process gate retained.
• Radio-disabled bring-up firmware and serialized fixture-log capture.
• Manufacturer research and the remaining prototype-to-production plan.

Verified at this checkpoint

• All 15 local pipeline stages passed, including 112 host regressions and 22 actual KiCad tests.
• Generated sources reproduce byte-identically; enclosure model checks and draft export checks pass.
• ERC: zero violations. Both boards: zero DRC errors, warnings and schematic/PCB parity differences.
• A fresh ESP32-C6 firmware build passed using pinned ESP-IDF v5.5.4.

These are local development checks; they do not claim that GitHub CI or physical qualification has completed.

Known limitations

• Routing remains incomplete: 42 unconnected items on A / 34 on B. USB and remaining power/control/test branches need completion and review.
• No physical boards, battery-pack samples or bench measurements have been qualified. All five prototype review records and seven product qualification records remain open.
• Supplier/assembler acceptance, exact procurement, U4 via-in-pad processing and physical electrical/mechanical/thermal/RF checks remain open.
• Firmware is bring-up only: radio, charging and USB500 remain disabled; product journal, provisioning, MQTT/TLS and signed OTA remain unfinished.

Download the automatically provided Source code ZIP or tarball below to inspect this exact source revision. No qualified manufacturing package is attached. Do not submit draft exports for fabrication.

See docs/01-execution-plan.md, docs/93-routing-checkpoint-review.md and docs/65-prototype-to-production.md in the tagged source for the review record and remaining gates.