lunchkey

Control Novation Launchkey MIDI keyboard with LED animations and MIDI functionality.

Description

lunchkey is a Python library and command-line tool for controlling Novation Launchkey MIDI keyboards. It provides functionality to:

• Connect to Launchkey devices via MIDI
• Control LED lights on the keyboard
• Run animated LED patterns
• Switch between Basic and InControl modes
• Automatically detect Launchkey models (MK1, MK2, MK3)

Features

• MIDI Integration: Uses mido and python-rtmidi for robust MIDI communication
• LED Control: Full control over all 18 LED lights (9 per row)
• Animation System: Built-in LED sweep animation with customizable colors
• Model Detection: Automatic detection of Launchkey model for proper MIDI channel usage
• Port Management: Smart MIDI port connection with fallback strategies
• Command Line Interface: Easy-to-use CLI for quick testing and control

Requirements

• Python 3.10 or higher
• Novation Launchkey MIDI keyboard (MK1, MK2, or MK3)
• MIDI drivers installed on your system

Installation

Using uv (Recommended)

uv is a fast Python package installer and resolver.

1. Install uv (if not already installed):

   # On Windows (PowerShell)
   powershell -c "irm https://astral.sh/uv/install.ps1 | iex"
   
   # On macOS/Linux
   curl -LsSf https://astral.sh/uv/install.sh | sh
   

2. Clone and install the project:

   git clone https://github.com/aminya/lunchkey.git
   cd lunchkey
   uv sync
   

3. Run Python scripts directly with uv:

   # Run the main script
   uv run python -m lunchkey.main
   
   # Or activate the virtual environment for interactive use
   uv shell
   

Usage

Command Line Interface

The main script provides several command-line options:

# List available MIDI ports
uv run python -m lunchkey.main --list-ports

# Connect to a specific MIDI port
uv run python -m lunchkey.main --port "MIDIOUT2"

# Connect without running animation (useful for testing)
uv run python -m lunchkey.main --port "MIDIOUT2" --no-animation

# Use default port (MIDIOUT2)
uv run python -m lunchkey.main

Python API

from mido.backends.backend import Backend
from lunchkey.main import Launchkey

# Initialize and connect
backend = Backend(name="mido.backends.rtmidi", load=True)
launchkey = Launchkey(backend)

# Connect to MIDI port
launchkey.connect_midi_output("MIDIOUT2")

# Detect model and enable InControl mode
launchkey.detect_launchkey_model()
launchkey.set_incontrol_mode(True)

# Control individual LEDs
launchkey.write_led(96, 127)  # Turn on first LED with full brightness

# Turn off all LEDs
launchkey.turn_off_all_leds()

# Clean up
launchkey.close()

MIDI Port Configuration

The tool automatically tries to connect to MIDI ports in this order:

1. Direct connection: Uses the specified port name/index
2. Pattern matching: Searches for ports containing the specified name
3. Fallback: Attempts to connect to port index 0

Common MIDI port names for Launchkey devices:

• MIDIOUT2 (Windows)
• Launchkey MK3 (macOS/Linux)
• Launchkey MK2 (macOS/Linux)

Launchkey Models

The tool automatically detects your Launchkey model:

• MK1: Uses MIDI channel 0 for InControl mode
• MK2/MK3: Uses MIDI channel 15 for InControl mode

LED Layout

The Launchkey has 18 LEDs arranged in two rows:

• Row 1: Notes 96-104 (9 LEDs)
• Row 2: Notes 112-120 (9 LEDs)

LED colors are controlled via velocity values (0-127), with specific ranges for different colors.

Development

Project Structure

lunchkey/
├── lunchkey/
│   └── main.py          # Main implementation
├── pyproject.toml       # Project configuration
├── uv.lock             # Dependency lock file
└── README.md           # This file

Dependencies

• mido>=1.3.3: MIDI library for Python
• python-rtmidi>=1.5.8: Real-time MIDI backend

Running Tests

# Run tests directly with uv (recommended)
uv run pytest

# Or activate virtual environment first
uv shell
pytest

Troubleshooting

Common Issues

1. "No MIDI ports found"

   • Ensure MIDI drivers are installed
   • Check that your Launchkey is connected and powered on
   • Try running --list-ports to see available ports

2. "Failed to open port"

   • Verify the port name with --list-ports
   • Ensure no other applications are using the MIDI port
   • Try using port index instead of name

3. LEDs not responding

   • Check that InControl mode is enabled
   • Verify MIDI channel settings for your Launchkey model
   • Ensure the device is in the correct mode

MIDI Setup

• Windows: Install Novation USB MIDI drivers
• macOS: Use built-in Core MIDI support
• Linux: Install timidity or similar MIDI utilities

Contributing

1. Fork the repository
2. Create a feature branch
3. Make your changes
4. Add tests if applicable
5. Submit a pull request

License

This project is licensed under the terms specified in the LICENSE file.

Acknowledgments

• Novation for the Launchkey hardware and the programmer's guide
• The mido and python-rtmidi projects for MIDI functionality