OpenFlexure Motor Board stage — device market

Install

Three ways to run this device. Each one serves its fake backend: no instrument, no simulator install and no upstream checkout.

OpenAI4S (one command)

shell

openai4s lab add labs/rwb27__openflexure_nano_motor_controller

Installs the device into the OpenAI4S Lab on its fake backend and starts it. First time? See setup below.

Or, in the workbench, open the Lab tab → Market → Install.

Standalone MHS endpoint

shell

git clone --depth 1 https://github.com/PKU-YuanGroup/OpenMHS.git && cd OpenMHS
PYTHONPATH=MHS/sdk/src python3 -m mhs serve labs/rwb27__openflexure_nano_motor_controller --port 7400
# in a second terminal, from the same directory:
PYTHONPATH=MHS/sdk/src python3 -m mhs describe --endpoint http://127.0.0.1:7400

Serves the device as an MHS endpoint on port 7400 from an OpenMHS clone (Python 3.10 or later, standard library only); describe prints what it offers.

Any MCP host (Claude Desktop, Cursor, …)

mcp configuration

{
  "mcpServers": {
    "openflexure-nano-motor-controller": {
      "command": "python3",
      "args": [
        "-m",
        "mhs",
        "serve",
        "labs/rwb27__openflexure_nano_motor_controller",
        "--mcp"
      ],
      "env": {
        "PYTHONPATH": "/path/to/OpenMHS/MHS/sdk/src"
      }
    }
  }
}

Add this server to the host's MCP configuration and replace /path/to/OpenMHS with the path of your OpenMHS clone. The host starts the server and talks to it on stdin and stdout.

What it does

Measures

firmware
position
step_time
ramp_time
endstop_status
endstop_maxima

Adjusts

Nothing declared.

Actions

move_relative: Move the stage by a relative displacement in integer motor steps
move_absolute: Move the stage to an absolute position in integer motor steps
focus_relative: Move the focus axis (Z) by a relative displacement in integer motor steps
home: Home the selected axes to their minimum, maximum or both endstops
release_motors: De-energise the stepper motor coils with the firmware release command

Names as the driver declares them. Units, limits and the safety declaration are in the package's REFERENCE.md.

First-time setup

The OpenAI4S workbench with the OpenMHS lab, from a source checkout:

shell

# OpenAI4S workbench with the OpenMHS lab (source checkout)
git clone --recursive https://github.com/PKU-YuanGroup/OpenAI4S.git
cd OpenAI4S && ./setup.sh && source .venv/bin/activate
openai4s lab add labs/rwb27__openflexure_nano_motor_controller
openai4s serve        # open the Lab tab

The standalone endpoint and the MCP server need only an OpenMHS clone and Python 3.10 or later. More in the market's getting-started guide and on the OpenAI4S host page.

Source and evidence

Upstream: rwb27/openflexure_nano_motor_controller
Pinned commit: 18a19977dde0
Licence: GPL-3.0
Stars: 15
Evidence: contract_checked on the fake backend
Backends: fake, hardware

The driver package MHS/drivers/labs/rwb27__openflexure_nano_motor_controller wraps the upstream code at the pinned commit. Its REFERENCE.md documents the full contract: every value, action, unit, limit and the safety declaration.