Add PCB layout and panel design

PCB: - 28x100mm 2-layer board outline - Mounting holes for M3 screws - Component placement guide with coordinates - Routing guidelines and design rules Panel: - 6HP (30x128.5mm) Eurorack panel specification - SVG design with hole positions - Supports aluminum, PCB, or acrylic manufacturing Updated main README with full project documentation.
2026-01-23 03:40:00 +01:00
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+# SN-L00 PCB Layout Guide
+
+## Board Dimensions
+
+| Parameter | Value | Notes |
+|-----------|-------|-------|
+| Width | 28.0mm | 6HP panel = 30mm, PCB 1mm clearance each side |
+| Height | 100.0mm | Fits standard 3U with clearance |
+| Thickness | 1.6mm | Standard PCB |
+| Layers | 2 | Front + Back copper |
+| Depth (mounted) | ~22mm | Skiff-friendly (<25mm) |
+
+## Mounting Holes
+
+| Hole | Position | Size |
+|------|----------|------|
+| MH1 (top) | 14.0, 5.0 | 3.2mm (M3) |
+| MH2 (bottom) | 14.0, 95.0 | 3.2mm (M3) |
+
+## Component Placement (Top to Bottom)
+
+```
+     0mm                    28mm
+      │←────── 28mm ───────→│
+      ┌────────────────────┐ ─┬─ 0mm
+      │    ○ MH1 (M3)      │  │
+      │                    │  │ 5mm
+      ├────────────────────┤ ─┤
+      │                    │  │
+      │  ┌──────────────┐  │  │
+      │  │    OLED      │  │  │ 10-25mm
+      │  │   MOD2       │  │  │
+      │  │  (128x32)    │  │  │
+      │  └──────────────┘  │  │
+      │                    │  │
+      ├────────────────────┤ ─┤
+      │       [BTN]        │  │ 28-35mm
+      │        SW1         │  │
+      ├────────────────────┤ ─┤
+      │                    │  │
+      │  ┌──────────────┐  │  │
+      │  │  RP2040-Zero │  │  │ 38-55mm
+      │  │    MOD1      │  │  │
+      │  │  (18x23mm)   │  │  │
+      │  └──────────────┘  │  │
+      │                    │  │
+      ├────────────────────┤ ─┤
+      │  SMD Components    │  │
+      │  U1 U2 U3          │  │ 58-75mm
+      │  C1-C5 R1-R6       │  │
+      │  D1-D4 D2(LED)     │  │
+      ├────────────────────┤ ─┤
+      │                    │  │
+      │  ○ J2    ○ J3      │  │ 78-88mm
+      │  TRIG   RETURN     │  │
+      │                    │  │
+      ├────────────────────┤ ─┤
+      │  ═══════════════   │  │ 88-95mm
+      │       J1           │  │
+      │  (Eurorack 2x5)    │  │
+      ├────────────────────┤ ─┤
+      │    ○ MH2 (M3)      │  │ 95mm
+      └────────────────────┘ ─┴─ 100mm
+```
+
+## Detailed Placement Coordinates
+
+### Modules (Hand-solder)
+
+| Ref | Component | Center X | Center Y | Rotation |
+|-----|-----------|----------|----------|----------|
+| MOD2 | OLED 128x32 | 14.0 | 17.5 | 0° |
+| MOD1 | RP2040-Zero | 14.0 | 46.5 | 0° |
+
+### User Interface
+
+| Ref | Component | Center X | Center Y | Rotation |
+|-----|-----------|----------|----------|----------|
+| SW1 | Tactile 6x6mm | 14.0 | 31.5 | 0° |
+| D2 | Power LED | 24.0 | 31.5 | 0° |
+| R2 | LED resistor 1K | 24.0 | 36.0 | 90° |
+
+### Connectors
+
+| Ref | Component | Center X | Center Y | Rotation |
+|-----|-----------|----------|----------|----------|
+| J2 | Thonkiconn TRIG | 7.0 | 83.0 | 0° |
+| J3 | Thonkiconn RETURN | 21.0 | 83.0 | 0° |
+| J1 | 2x5 Eurorack | 14.0 | 92.0 | 0° |
+
+### Power Section (Back side recommended)
+
+| Ref | Component | Center X | Center Y | Rotation | Side |
+|-----|-----------|----------|----------|----------|------|
+| D1 | SS14 Schottky | 7.0 | 65.0 | 0° | Back |
+| U1 | AMS1117-3.3 | 14.0 | 65.0 | 0° | Back |
+| C1 | 10uF input | 10.0 | 60.0 | 0° | Back |
+| C2 | 10uF output | 18.0 | 60.0 | 0° | Back |
+| C3 | 100nF output | 21.0 | 60.0 | 0° | Back |
+
+### Signal Conditioning
+
+| Ref | Component | Center X | Center Y | Rotation | Side |
+|-----|-----------|----------|----------|----------|------|
+| U2 | 74LVC1G17 | 7.0 | 72.0 | 0° | Front |
+| C4 | 100nF (U2) | 7.0 | 68.0 | 0° | Front |
+| R3 | 100R trig | 7.0 | 76.0 | 90° | Front |
+| U3 | MCP6001 | 21.0 | 72.0 | 0° | Front |
+| C5 | 100nF (U3) | 21.0 | 68.0 | 0° | Front |
+| R4 | 10K input | 21.0 | 76.0 | 90° | Front |
+| R5 | 10K divider | 18.0 | 76.0 | 90° | Front |
+| R6 | 22K divider | 18.0 | 72.0 | 90° | Front |
+| D3 | BAT54 clamp | 24.0 | 70.0 | 90° | Front |
+| D4 | BAT54 clamp | 24.0 | 74.0 | 90° | Front |
+
+### Button
+
+| Ref | Component | Center X | Center Y | Rotation |
+|-----|-----------|----------|----------|----------|
+| R1 | 10K pullup | 10.0 | 35.0 | 0° |
+
+## Routing Guidelines
+
+### Net Classes
+
+| Class | Width | Clearance | Via Drill |
+|-------|-------|-----------|-----------|
+| Default | 0.25mm | 0.2mm | 0.3mm |
+| Power | 0.5mm | 0.3mm | 0.4mm |
+| Signal | 0.2mm | 0.2mm | 0.3mm |
+
+### Power Routing
+
+1. **+12V** path: J1 pin 4 → D1 → C1 → U1 VIN
+2. **+3.3V** path: U1 VOUT → C2/C3 → distribute to all ICs
+3. **GND**: Use ground pour on back layer, via stitch near decoupling caps
+
+### Signal Routing Priority
+
+1. I2C (SDA/SCL): Keep short, parallel, 0.5mm spacing
+2. TRIG_OUT: Direct from RP2040 GP2 → U2 → R3 → J2
+3. RETURN_IN: J3 → R4 → divider → U3 → RP2040 GP3
+4. BTN: RP2040 GP4 → R1 → SW1 → GND
+
+### Ground Plane
+
+- Fill back copper with GND zone
+- Via stitch every 5-10mm
+- Keep clear around power input for thermal relief
+- Connect GND pins of J2/J3 directly to plane
+
+## Design Rules (PCBWay Compatible)
+
+| Parameter | Value |
+|-----------|-------|
+| Min trace width | 0.15mm (0.2mm preferred) |
+| Min clearance | 0.15mm (0.2mm preferred) |
+| Min via drill | 0.3mm |
+| Min via diameter | 0.6mm |
+| Min hole size | 0.3mm |
+| Min annular ring | 0.15mm |
+
+## Silkscreen
+
+### Front
+
+- Component references (small, 0.8mm text)
+- Jack labels: "TRIG" and "RETURN"
+- "SN-L00 v0.1" at bottom
+- "SubModular" at top
+
+### Back
+
+- "SN-L00" centered
+- Pin 1 indicators for ICs
+- Polarity markers for D1, power header
+- "git.sub-net.at/submodular/SN-L00"
+
+## Gerber Output
+
+When exporting for PCBWay:
+
+```
+Required files:
+- F.Cu (Front copper)
+- B.Cu (Back copper)
+- F.SilkS (Front silkscreen)
+- B.SilkS (Back silkscreen)
+- F.Mask (Front soldermask)
+- B.Mask (Back soldermask)
+- Edge.Cuts (Board outline)
+- *.drl (Drill file)
+
+Settings:
+- Format: Gerber X2
+- Drill: Excellon
+- Units: mm
+- Coordinate format: 4.6
+```
+
+## Assembly Notes
+
+1. PCBWay can assemble all SMD parts on both sides
+2. Hand-solder: MOD1 (RP2040-Zero), MOD2 (OLED)
+3. Jacks (J2, J3) can be assembled or hand-soldered
+4. Power header (J1) usually hand-soldered for alignment
+
+## Checking Before Order
+
+- [ ] DRC passes with no errors
+- [ ] All nets connected (no airwires)
+- [ ] Mounting holes align with panel
+- [ ] Jacks align with panel holes
+- [ ] Power header polarity marked
+- [ ] Silkscreen readable and not over pads
+- [ ] Ground plane connected properly