Single-Layer PCB Design优化
- Updated Camila’s PCB board size to the required 100mm × 100mm maximum.
- Applied routing defaults so all schematic nets are constrained to the bottom layer, with 0.25mm minimum trace/clearance and 0.25mm minimum trace-corner radius.
- Strengthened known power/ground routing rules for Net 1, Net 4, Net 7, Net 16, and GND to 0.5mm preferred / 0.4mm minimum trace width on the bottom layer.
- Recorded the strict layout requirements in the project file: Camila Embedded System Layout Requirements.
- Checked current validation: 40 airwire errors remain, so the board is not fully routed yet.
- ✅ Board size requirement applied: 100mm × 100mm.
- ✅ Bottom-layer-only net routing rules applied to all nets.
- ✅ Power/ground trace robustness rules applied to key rails.
- ❌ Compact placement/routing optimization could not be completed in this run.
- ❌ Full electrical connectivity is not achieved yet: 40 airwires remain.
- ❌ Final DRC/ERC clean validation is still pending.
Started implementing a plan
Goal: Update Camila’s PCB layout to fit within **100mm × 100mm max** and achieve a **fully routed, manufacturable** layout using **bottom-layer-only routing** (no top traces), prioritizing compact placement, short power/ground paths, edge-accessible connectors, minimal crossovers, **zero-via preference**, and **45° routing** where possible.
Work completed
- Resized PCB outline to **100mm × 100mm** and kept **Standard 2 Layer** stackup (pads may exist on both sides; routing will be constrained to bottom).
- Applied board-level manufacturability constraints: **0.25mm keepout/clearance**, **0.25mm min trace width**, **0.25mm min corner radius**.
- Enforced **bottom-layer default** on all nets by setting net routing layer to **Bottom**; strengthened power/return nets (**Net 1, Net 4, Net 7, Net 16, GND**) to **0.5mm trace width / 0.4mm min**, bottom-layer, high auto-layout priority.
- Updated project documentation with the agreed layout constraints and objectives in [Doc 1](https://www.flux.ai/inotreal/camilas-project~7g/files/camila-embedded-system-layout-requirements~sj).
- Verified current layout status: board is extremely dense (component area ~78.6% of 100×100), and **airwires remain** (routing incomplete).
Implementation plan (remaining)
1. Re-optimize PCB component placement for 100mm × 100mm single-layer routing
1. Run automated placement constrained to keep **24V-2A**, **PT100-T1**, **PT100-T2**, and **OLED I2C** on board edges.
2. Cluster the **LM2596 power section** and keep **C1** close to LM2596 output/return loop.
3. Group Arduino UNO (U1) with the LM358 stages (U2, U3) and the Wheatstone/trim network (R*, VR1/VR3) to reduce crossovers for bottom-only routing.
4. If density prevents routing, move small passives to the opposite side (bottom) while keeping connectors accessible and respecting the “no top traces” rule.
2. Configure routing policy for bottom-layer-only autorouting with minimal vias
1. Set autorouter available layers to **Bottom** only and select a strategy that minimizes/avoids vias.
2. Ensure routing style is 45° where supported (via corner radius/angle constraints).
3. Autoroute all nets and validate
1. Run autorouting to achieve **full electrical connectivity** (0 airwires).
2. Run DRC/ERC (at least: airwires, invalid layers, overlaps, missing footprints, acute-angle/corner checks) and fix issues by iterating placement + reroute.
4. Final manufacturability pass
1. Confirm there are **no top-layer traces** (pads allowed; routing must remain bottom).
2. Confirm power/ground routes are short and robust (0.5mm or wider on selected nets) and connectors remain at edges.
Notes / blockers
- Placement optimization tool call failed due to malformed proximity constraint schema (needs `near` and likely `nearPin` if using pin-targeted constraints). Must retry placement with valid constraint structures.
- Board density is flagged CRITICAL at 100×100; may require careful placement and/or bottom-side placement of passives to allow a bottom-only route.
Execution stopped due to insufficient credits.
0:20
- Arduino UNO
- OLED I2C
- LM2596 buck converter
- Wheatstone bridge
- LM358 amplifier stages
- 24V 2A power supply input
- Board size must be capped at 100mm x 100mm maximum.
- All routed traces must be on the bottom copper layer only; no top-layer traces are allowed.
- Prefer zero vias. Use vias only if absolutely unavoidable.
- Keep connectors accessible at board edges, including 24V-2A, PT100-T1, PT100-T2, and OLED I2C.
- Keep power and ground paths robust and short.
- Group the LM2596 power section together and keep C1 close to the LM2596 output path.
- Placement should be compact, connectivity-aware, and should minimize crossovers for single-layer routing.
- Routing should avoid acute angles and prefer 45-degree routing where possible.
- Maintain manufacturable clearances and trace widths.
Components
Current PCB Layout Requirements
