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CLAUDE.md is local-only by convention. It held the full hardware design reference, now relocated to hardware/DESIGN.md. README updated to reflect the actual repo state: no schematic or layout exists yet, so drop the aspirational schematic hierarchy and structure entries, drop (WIP) from the title, and add an accurate status line. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
83 lines
2.7 KiB
Markdown
83 lines
2.7 KiB
Markdown
# OpenVTX
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Open-source 5.8GHz analog video transmitter with software-defined OSD, based on [OpenOSD-X](https://github.com/OpenOSD-X) firmware.
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Early stage: parts are selected and project-local libraries are in place. Schematic and layout are not started yet. The full design reference lives in [hardware/DESIGN.md](hardware/DESIGN.md).
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## Planned Features
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### RF
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- **RTC6705** 5.8GHz FM synthesizer: 40+ channels (A/B/E/F/R bands)
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- **SKY85743-21** FEM: PA with integrated power detector, ~500mW CW output
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- IPEX/u.FL antenna connector
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### OSD
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- Software-defined analog OSD via STM32G4 OPAMP/DAC/DMA, no MAX7456 needed
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- SD (30x13/16) and HD (45x26/32) character modes
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- NTSC/PAL auto-detection
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### MCU
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- **STM32G431KBU6**: ARM Cortex-M4F @ 170MHz, QFN-32
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- MSP DisplayPort protocol (Betaflight native)
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- SmartAudio V2.1 fallback for legacy FCs
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### Power
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- **2S-6S direct input** (7-36V) via LMR51420 buck to 5V
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- 5V regulated output for camera
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- 3.3V LDO (TLV757, low-noise) for MCU and RF synth
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- Reverse polarity protection
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- TVS input transient protection
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### Safety
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- NTC thermistor on PA for thermal auto-throttle
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- Boot-to-pit-mode
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- VPD closed-loop power control with logarithmic detector
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## Repository Structure
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```
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OpenVTX/
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├── README.md
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├── hardware/
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│ ├── DESIGN.md ← Full design document (BOM, pinouts, RF chain, PCB specs)
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│ ├── OpenVTX.kicad_pro
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│ ├── lib.kicad_sym ← 14 symbols (project-local)
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│ ├── lib.pretty/ ← 14 footprints (project-local)
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│ ├── lib.3dshapes/ ← 3D models
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│ └── tools/ ← Python scripts
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└── reference/
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├── 043_OpenOSD-X_REFERENCE.pdf
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├── vpd_table.pdf
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├── Connection.png
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├── analog-vtx-market-analysis-2025-2026.md
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└── datasheets/ ← Component datasheets
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```
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## User Interface
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| Pad/Connector | Function |
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|---------------|----------|
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| +BATT / GND | Battery input (2-6S) |
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| 5V / GND | 5V output for camera |
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| VIN / GND | Video input (CVBS) |
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| TX / RX | UART to FC (MSP DisplayPort) |
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| SA | SmartAudio (single-wire fallback) |
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| IPEX | Antenna (5.8GHz via pigtail) |
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| BTN | Channel/power cycle button |
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| LED | WS2812 status indicator |
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| SWD | Debug test points (SWDIO, SWCLK, NRST) |
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## Key ICs
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| IC | Part | LCSC | Package |
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|----|------|------|---------|
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| MCU | STM32G431KBU6 | C529358 | QFN-32 5x5mm |
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| RF Synth | RTC6705 | C913074 | QFN-40 6x6mm |
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| FEM | SKY85743-21 | C5348950 | LGA-24 3x5mm |
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| Buck | LMR51420YDDCR | C5383002 | SOT-23-6 |
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| LDO | TLV75733PDRVR | C2868428 | WSON-6 2x2mm |
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## License
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Licensed under [CERN-OHL-S-2.0](https://ohwr.org/cern_ohl_s_v2.txt).
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