39 lines
1.8 KiB
Markdown
39 lines
1.8 KiB
Markdown
# USB/reset/LED autoroute — run on your Mac, then import the .ses
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**DSN:** `hbox-watchdog-v3-PROD-usb.dsn` — the current 132-part board **with your existing
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routing already in it** (1069 wires) + the 9 new nets unrouted. So FreeRouting starts with
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"incomplete" ≈ the 9 new connections and should drive to **0** almost immediately — it's only
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routing USB_VBUS/DP/DM, USB_CC1/CC2, MODEM_RST, MODEM_LED(_A). GND rides the In1 plane.
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Clearance 0.2 mm, width 0.2 mm (fine for these low-current USB/signal nets).
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## 1. Route it
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Headless (simplest):
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```bash
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cd "/Users/leo/Documents/Claude/Projects/Drogheda/03-Architecture-Hardware/kicad"
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java -jar freerouting-1.9.0.jar \
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-de hbox-watchdog-v3-PROD-usb.dsn \
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-do hbox-watchdog-v3-PROD-usb.ses \
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-mp 30
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```
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Or GUI (more control): `java -jar freerouting-1.9.0.jar` → **File → Open Design** →
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`hbox-watchdog-v3-PROD-usb.dsn` → watch the **incomplete** count fall to 0 → **File → Export
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Specctra Session File** → `hbox-watchdog-v3-PROD-usb.ses`.
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> The DSN carries your existing traces, so FreeRouting mostly just fills in the 9 new nets. If you
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> want to be conservative and let it touch the existing routing as little as possible, stop as soon
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> as incomplete hits 0 (GUI) — no need to let it grind optimization passes.
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## 2. Bring it back into KiCad
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Open the board → **File → Import → Specctra Session** → `hbox-watchdog-v3-PROD-usb.ses` →
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press **B** to refill the In1 GND plane → **Inspect → Design Rules Checker**.
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Paste me the DRC summary and I'll help clear anything real before you fab. **Do not run F8** —
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the parts are already placed; you're only importing routing now.
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## 3. Fab
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Re-export the JLCPCB package (Gerbers + drill + BOM + CPL), order as **4-layer** (F.Cu / In1 GND /
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In2.Cu / B.Cu, JLC 1.6 mm standard).
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