This project demonstrates how to connect a MIDI controller to a Raspberry Pi, read MIDI input, and display mapped parameter values on a 1.3” Waveshare OLED screen. The parameters are configured via a JSON file, allowing for customizable control and display of various settings.
- Overview
- Features
- Requirements
- Setup
- Running the Script
- Configuration
- Project Structure
- Usage
- License
- Roadmap/Todo
This project reads MIDI input from a connected MIDI controller, maps the MIDI messages to configurable parameters, and displays the parameter names and values on an OLED screen. The parameters are categorized into three sections: global, background, and foreground, and can be of type range, toggle, or step.
• MIDI Input Handling: Reads MIDI input from a connected MIDI controller via USB.
• Parameter Mapping: Maps MIDI control change (CC) and note messages to configurable parameters.
• OLED Display: Displays the parameter name and value on a 1.3” Waveshare OLED screen.
• Configurable JSON File: Allows customization of parameters, including their types, ranges, and MIDI mappings.
• Real-time Updates: Updates the display in real-time as MIDI messages are received.
• Raspberry Pi (with Raspbian OS installed)
• MIDI Controller (USB connection)
• 1.3” Waveshare OLED Screen (SPI connection)
• Python 3
• Pygame (for MIDI)
• SH1106 OLED driver (bundled with this repo)
• Pillow (Python Imaging Library)
sudo apt-get update
sudo apt-get install python3-pil python3-numpy python3-spidev python3-smbus python3-pygame python3-websocketssudo raspi-config- Navigate to Interfacing Options -> SPI and enable it.
- Also configure WiFi and enable SSH
echo ‘gpio=6,19,5,26,13,21,20,16=pu’ >> /boot/firmware/config.txtReboot
cd midimapper
• Connect the MIDI controller via USB.
• Connect the OLED screen to the Raspberry Pi via SPI (refer to the Waveshare documentation for wiring details).
- Update the JSON Configuration: Modify the parameters.json file to configure your parameters. Refer to the Configuration section for details.
- Run the Main Script:
python3 main.pyThe script will start reading MIDI input and displaying the mapped parameters on the OLED screen.
The parameters.json file defines the parameters and their mappings to MIDI messages. The file is structured into three sections: global, background, and foreground. Each parameter can be of type range, toggle, or step.
Example parameters.json
{
"global": {
"brightness": {
"min": 0,
"max": 255,
"default": 80,
"description": "Global brightness setting",
"type": "range",
"cc": 19
},
"bpm": {
"min": 0,
"max": 260,
"default": 80,
"description": "System Beats per Minute",
"type": "range",
"cc": 23
},
"blendTime": {
"min": 0,
"max": 10000,
"default": 4000,
"description": "Blend time, in milliseconds",
"type": "range",
"cc": 27
},
"preset": {
"default": 0,
"description": "Preset preconfigured with all settings",
"type": "step",
"values": [0, 1, 2, 3, 4, 5],
"cc": 26
},
"autoAdvancePalette": {
"min": 0,
"max": 1,
"default": 1,
"description": "Auto advance palette?",
"type": "toggle",
"cc": 1
},
"autoAdvanceDelay": {
"min": 10,
"max": 180,
"default": 60,
"description": "Auto advance delay in seconds",
"type": "range",
"cc": 31
},
"fixMode": {
"default": "NONE",
"description": "Animation fixed mode",
"type": "step",
"values": ["RADAR", "RADIATE", "PAUSE", "NONE"],
"cc": 3
}
},
"background": {
"bgPaletteIndex": {
"min": 0,
"max": 60,
"default": 0,
"description": "Background palette index",
"type": "range",
"cc": 16
},
"bgRotSpeed": {
"min": 0,
"max": 255,
"default": 85,
"description": "Background rotation speed. 128 = stop",
"type": "range",
"cc": 17
},
"bgLineWidth": {
"min": 1,
"max": 15,
"default": 4,
"description": "Background line width. Higher = thinner lines.",
"type": "range",
"cc": 18
}
},
"foreground": {
"fgAnimationEnable": {
"min": 0,
"max": 1,
"default": 1,
"description": "Enable foreground animation pattern",
"type": "toggle",
"cc": 4
},
"fgPaletteIndex": {
"min": 0,
"max": 2,
"default": 0,
"description": "Foreground palette; red stripe or green stripe",
"type": "range",
"cc": 20
},
"fgRotSpeed": {
"min": 0,
"max": 255,
"default": 170,
"description": "Foreground rotation speed. 128 = stop",
"type": "range",
"cc": 21
},
"fgLineWidth": {
"min": 1,
"max": 14,
"default": 8,
"description": "Foreground line width. Higher = thinner lines.",
"type": "range",
"cc": 22
}
}
}- config_loader.py: Contains the function to load and parse the JSON configuration.
- midi.py: Contains functions related to MIDI data formatting and mapping.
- oled.py: Contains functions related to initializing and displaying text on the OLED.
- main.py: Main script that ties everything together and handles MIDI input and display.
- parameters.json: Configuration file for defining parameters and their MIDI mappings.
- Customize parameters.json:
- Define your parameters and their mappings in the parameters.json file.
- Each parameter can be of type range, toggle, or step.
- Run the Main Script:
- Execute the main.py script to start reading MIDI input and displaying the mapped parameters.
- Monitor Console Output:
- The console will display the raw MIDI data and the mapped parameters for debugging and monitoring purposes.
This project is licensed under the MIT License. See the LICENSE file for more details.
- tap tempo by midi button
- set colors of knobs
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