Single-Layer PCB Design优化

flux

Work done
  • 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.
Success criteria review
  • ✅ 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.
Next steps
Continue with component re-placement inside the 100mm × 100mm boundary, keeping connectors at the edges and C1 near the LM2596 output path, then autoroute under the bottom-layer-only rules and re-check DRC/ERC until the airwires are cleared.

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

flux

I’m unable to continue executing the remaining layout optimization right now. Current project state from the prior work: the PCB outline is constrained to 100mm × 100mm, bottom-layer routing rules have been applied to all nets, key power/return nets have strengthened width rules, and the layout requirements were documented; however, the board is still very dense and routing is incomplete with airwires remaining. Remaining work is to retry placement optimization with valid edge/proximity constraints, keep connectors edge-accessible, cluster the LM2596/C1 power section and analog/Arduino groups, then autoroute bottom-layer-only and iterate DRC/ERC until there are 0 airwires, no top-layer traces, and no manufacturability violations.
RG
Resistance
150 Ω
RD
Resistance
10KΩ
RD
Resistance
10KΩ
RD
Resistance
10KΩ
R1
Resistance
10KΩ
R2
Resistance
100 Ω
RD
Resistance
10KΩ
R1
Resistance
10KΩ
12V
0V
3.3V
0V
12V
A
0V
5V
SDA
0V
12V
Vin
B
A
0V
12V
0V
0V
GND
SCK
GND
B
Signal
Vin
12V
Signal
SCK
5V
PT100-T1
C2
Capacitance
0.1uF
VR3
Resistance
5kΩ
U2
Manufacturer Part Number
LM358P
24V-2A
OLED I2C
LM2596
VR1
Resistance
5kΩ
U3
Manufacturer Part Number
LM358P
PT100-T2
C1
Capacitance
10uF
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