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A custom STM32G0B1-based telescope controller board focused on focuser and rotator control. Firmware is a port of OnStepX to a custom PCB, with added SHT31 weather sensor support and DFU bootloader management.
AstroUniBoard/
├── FW/ # Firmware (PlatformIO / Arduino / OnStepX)
│ ├── src/ # OnStepX source tree + custom config
│ ├── platformio.ini # Build configuration
│ └── tools/ # Firmware manager MCP server (DFU upload)
├── HW/ # Hardware (PCB designs, schematics — KiCad)
└── docs/
├── HARDWARE.md # Pin assignments and hardware overview
└── FIRMWARE.md # Build and upload guide
| MCU | STM32G0B1CBT6 (ARM Cortex-M0+ @ 64 MHz) |
| Flash / RAM | 128 KB / 144 KB SRAM |
| Package | 48-pin LQFP |
| Stepper Drivers | 2× TMC2209 (UART, shared bus) |
| NV Storage | 24AA64 I2C EEPROM (8 KB) |
| Weather Sensor | SHT31 (temperature + humidity, I2C) |
| Interface | USB CDC (native USB PA11/PA12) |
| Upload | DFU bootloader (ROM) |
| Axis | Function | Driver | UART Address |
|---|---|---|---|
| AXIS3 | Rotator | TMC2209 | 1 |
| AXIS4 | Focuser | TMC2209 | 0 |
Mount axes (AXIS1/AXIS2) are disabled — this board is focuser/rotator only.
See docs/HARDWARE.md for full pin assignments.
Based on OnStepX — advanced telescope controller firmware with LX200 protocol compatibility, ASCOM support, and stepper motor control.
STM32G0B1.h — HAL implementation for STM32G0B1CBT6Pins.AUB_FocRot.h — Custom pinmap (model AUB_FOCROT = 25):EDFU# command — jump to DFU ROM bootloader for firmware updates-Os -std=gnu++17FW/ folder in VS CodeCtrl+Alt+B (environment: nucleo_g0b1re)Ctrl+Alt+U:EDFU# via serial to enter DFU, then uploadSee docs/FIRMWARE.md for full build and upload instructions.
| Command | Action |
|---|---|
:EDFU# | Jump to DFU ROM bootloader (firmware upload) |
:ERESET# | Reset MCU |
:ENVRESET# | Wipe NV memory (takes effect on next boot) |
Plus the full OnStepX LX200 command set.
FW/tools/firmware_manager/server.py — MCP server that automates DFU firmware updates from Claude Code or any MCP client.
pip install -r FW/tools/firmware_manager/requirements.txt
python FW/tools/firmware_manager/server.py
Key tool: enter_dfu_and_upload(port, firmware_path) — sends :EDFU#, waits for re-enumeration, uploads via dfu-util.
Firmware is licensed under the GPL (inherited from OnStepX). See FW/src/LICENSE.
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