USB-C 12-Channel Servo Controller

12-channel USB-C servo controller, Pololu Maestro compatible, with an MCP server so AI agents (Claude, etc.) can drive servos. $18 on Tindie · product page.

_{▶ 2-minute video: wiring, current monitoring, GUI and the controller driving a real MG995}

Open-source alternative to the Pololu Mini Maestro 12 that speaks the Maestro serial protocols, so Maestro libraries work unchanged — plus USB-C, servo-rail current and voltage sensing, on-board scripts. Built for JLCPCB turnkey assembly, ≈ $4.43 per board at 100 units against $29.95 for the Maestro.

AI agents (MCP server)

tools/servo_mcp.py is an MCP server that lets an AI agent move servos, run poses and sequences, and read rail current/voltage, with guardrails: per-channel limits, ramped moves, overcurrent stop. pip install -r tools/requirements.txt, then:

Claude Code

claude mcp add servo -- python /path/to/UsbServoController/tools/servo_mcp.py

Claude Desktop (claude_desktop_config.json)

{
  "mcpServers": {
    "servo": {
      "command": "python",
      "args": ["/path/to/UsbServoController/tools/servo_mcp.py"]
    }
  }
}

Add "--port", "COM5" to pick a port, or "--mock" to try it without hardware. Close the GUI first: only one program can hold the serial port.

The server is also on PyPI, so any MCP client can run it without cloning the repo: command uvx, args ["ucan-servo-mcp"] (plus --config path/to/servogui.json to use the limits, poses and sequences saved by the GUI).

1. Quick start

pip install -r tools/requirements.txt
python tools/servogui.py              # GUI (or --mock with no hardware)
python tools/servoctl.py set 0 1500   # CLI
cd embedded-ch32 && make flash        # build + flash over USB, ~3 s, no jumper

Downloads: firmware images and the prebuilt GUI for Windows and Linux are on the Releases page. To build the GUI yoursel

... View full README on GitHub