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
parent 64f9e34fc3
commit c4e1a43dfa
7 changed files with 739 additions and 17 deletions
@@ -1,35 +1,117 @@
-# SN-L00
+# SN-L00 Latency Tester

-Eurorack latency testing module by SubModular.
+Eurorack module for measuring round-trip latency in audio/CV signal chains.

-## Overview
+**Organization**: [SubModular](https://git.sub-net.at/submodular) / Sub-Net e.U.

-SN-L00 measures round-trip latency in Eurorack signal chains. Useful for testing delay through effects, digital modules, audio interfaces, and DAW processing.
+## Features
+
+- Measures latency from 0.01ms to 999ms
+- 128×32 OLED display showing milliseconds
+- Three modes: Single shot, Continuous, Statistics
+- Skiff-friendly depth (<25mm)
+- USB serial output for logging
+
+## Specifications
+
+| Parameter | Value |
+|-----------|-------|
+| Width | 6 HP (30mm) |
+| Depth | <25mm |
+| Power +12V | ~25mA |
+| Power -12V | 0mA |
+| Resolution | 0.01ms |
+| Output | 0-3.3V trigger |
+| Input | 0-10V tolerant |

 ## Project Structure

 ```
-hardware/
-  kicad/      # Schematics and PCB
-  panel/      # Front panel design
-firmware/     # Microcontroller code (if applicable)
-docs/         # Documentation and user manual
+SN-L00/
+├── hardware/
+│   ├── BOM.md              # Bill of materials with LCSC part numbers
+│   ├── kicad/              # KiCad schematic and PCB
+│   │   ├── SN-L00.kicad_pro
+│   │   ├── SN-L00.kicad_sch
+│   │   ├── SN-L00.kicad_pcb
+│   │   ├── README.md       # ASCII schematic reference
+│   │   └── PCB_LAYOUT.md   # Placement guide
+│   └── panel/
+│       ├── PANEL_SPEC.md   # Dimensions and specifications
+│       └── SN-L00_panel.svg # Panel design
+├── firmware/
+│   ├── CMakeLists.txt      # Pico SDK build
+│   ├── README.md           # Build instructions
+│   ├── include/            # Header files
+│   └── src/                # Source files
+└── docs/
+    └── DESIGN.md           # Technical design document
 ```

-## Specifications
+## Hardware

- Width: TBD HP
- Power: TBD mA (+12V), TBD mA (-12V)
- Depth: TBD mm
+### Components

-## Status
+| Part | Description |
+|------|-------------|
+| MCU | RP2040-Zero (Waveshare) |
+| Display | 0.91" OLED 128×32 I2C |
+| Output buffer | 74LVC1G17 Schmitt trigger |
+| Input buffer | MCP6001 op-amp |
+| Regulator | AMS1117-3.3 LDO |

-Early development - concept phase.
+Full BOM with LCSC part numbers in [hardware/BOM.md](hardware/BOM.md).
+
+### Manufacturing
+
+- PCB: 2-layer, 28×100mm
+- Assembly: PCBWay or similar (SMD parts)
+- Hand-solder: RP2040-Zero module, OLED module
+- Panel: Aluminum or PCB (6HP)
+
+## Firmware
+
+Built with Raspberry Pi Pico SDK.
+
+```bash
+export PICO_SDK_PATH=/path/to/pico-sdk
+cd firmware
+mkdir build && cd build
+cmake .. && make
+```
+
+Flash `sn_l00.uf2` via USB bootloader.
+
+See [firmware/README.md](firmware/README.md) for details.
+
+## Usage
+
+1. Connect **TRIG OUT** to your signal chain input
+2. Connect your signal chain output to **RETURN IN**
+3. Press button to measure latency
+4. Long press to toggle continuous mode
+
+### Modes
+
+- **SINGLE**: Press to measure once
+- **CONT**: Auto-measures every 500ms, shows live reading
+- **STATS**: Shows min/max/average after continuous mode
+
+## Typical Latency Values
+
+| Source | Expected Latency |
+|--------|------------------|
+| Analog modules | <0.1ms |
+| Digital Eurorack (DSP) | 1-5ms |
+| Audio interface round-trip | 3-20ms |
+| DAW + plugins | 5-50ms+ |

 ## License

 TBD

---
+## Links

-*SubModular - Eurorack hardware by Sub-Net e.U.*
+- Repository: https://git.sub-net.at/submodular/SN-L00
+- Organization: https://git.sub-net.at/submodular
+- Parent: [Sub-Net e.U.](https://sub-net.at)