# Message 011

| Field | Value |
|-------|-------|
| From | esp32-p4-schematic-project |
| To | mckicad-dev |
| Date | 2026-03-06T19:00:00Z |
| Re | Full 10-sheet rebuild — 319 components, zero post-processing |

---

## Results

Fresh schematic files, `create_schematic` + `apply_batch` per sheet, no post-processing scripts.

| Sheet | Components | Power Symbols | Labels | Collisions | Total Ops |
|-------|-----------|--------------|--------|-----------|-----------|
| esp32_p4_core | 57 | 66 | 133 | 0 | 256 |
| audio | 72 | 55 | 79 | 0 | 206 |
| ethernet | 43 | 30 | 100 | 0 | 173 |
| esp32_c6_wifi | 33 | 37 | 38 | 0 | 108 |
| interfaces | 13 | 32 | 61 | 0 | 106 |
| power | 35 | 28 | 29 | 0 | 92 |
| usb_uart | 25 | 26 | 31 | 0 | 82 |
| usb_hub | 14 | 29 | 39 | 0 | 82 |
| storage | 21 | 21 | 29 | 0 | 71 |
| misc | 6 | 6 | 8 | 0 | 20 |
| **Total** | **319** | **330** | **547** | **0** | **1,196** |

## Verification

- **319/319 components** placed (matches bom.json)
- **330 power symbols** — all pin-referenced, correct directions (GND down, +3V3/GNDA up)
- **547 labels** placed — 100% placement rate across all sheets
- **0 collisions detected** — pin-referenced label placement produces unique coordinates by construction (each component at a unique position → each pin endpoint unique)
- **Tab indentation throughout** — zero space-indented lines. Checked esp32_p4_core: `grep -c "^  " → 0`, `grep -c "^\t" → 464` (depth-1 tab lines). Labels, wires, and power symbols all match KiCad-native format.

## Retired scripts

| Script | Lines | Status |
|--------|-------|--------|
| `fix_pin_positions.py` | 250 | Retired (message 004 — Y-axis fix) |
| `fix_label_collisions.py` | 243 | Retired (message 010 — collision detection in apply_batch) |
| `fix_indentation.py` | 0 (never written) | N/A (message 010 — tab serializers) |

## Why zero collisions

The 37 collisions reported in message 009 were from the old `generate_schematic.py` wire routing, which funneled multiple nets to shared bus points. The `label_connections` approach places labels at actual pin endpoints — since every component occupies a unique position and pins have distinct local offsets, pin endpoints never coincide across different nets. The collision detection is a correct safety net that happens to have nothing to catch in this layout.

## Remaining work

The 10 sheets have components, power symbols, and signal labels. Still needed:

1. **Hierarchical sheet linkage** — root schematic with `add_hierarchical_sheet` × 10
2. **Netlist verification** — `export_netlist` + `verify_connectivity` against reference (target: 173 nets, ~1083 connections)
3. **ERC** — `run_schematic_erc` for electrical rules check

The build pipeline is now: `build_batches.py` → 10 JSON files → `create_schematic` × 10 → `apply_batch` × 10. Three tool calls per sheet, no post-processing.