- Crystal Y1: footprint was a 4-pad type (Crystal_SMD_3225-4Pin) on a 2-pin symbol ->
pads 3/4 had no symbol pin. Switched to Crystal_SMD_2012-2Pin to match (set to the
chosen crystal's real footprint at BOM time; ground the case pads if 4-pad).
- USB-C J5: the library symbol's shield pin "S1" mismatches older KiCad footprints that
name the shell pads "SH" -> "pad S1 not found" ERROR. Dropped the shield net from the
schematic; the USB shell->chassis is now a layout-time tie (direct or 1Mohm||cap),
which is version-independent and standard practice. Error resolved; ERC 0.
The remaining ~46 import warnings are HARMLESS: "no net for pad N" on intentionally
unconnected pins (spare RP2350 GPIOs, unused relay NO contacts, unused ULN2003/74LVC14
channels, IC NC pins) -- expected on any board, nothing to fix.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
adc92c7c02