Introduction

BLE MIDI service for CircuitPython

Dependencies

This driver depends on:

Adafruit CircuitPython

Please ensure all dependencies are available on the CircuitPython filesystem. This is easily achieved by downloading the Adafruit library and driver bundle.

Installing from PyPI

Note

This library is not available on PyPI yet. Install documentation is included as a standard element. Stay tuned for PyPI availability!

On supported GNU/Linux systems like the Raspberry Pi, you can install the driver locally from PyPI. To install for current user:

pip3 install adafruit-circuitpython-ble-midi

To install system-wide (this may be required in some cases):

sudo pip3 install adafruit-circuitpython-ble-midi

To install in a virtual environment in your current project:

mkdir project-name && cd project-name
python3 -m venv .venv
source .venv/bin/activate
pip3 install adafruit-circuitpython-ble-midi

Usage Example

"""
This example sends MIDI out. It sends NoteOn and then NoteOff with a random pitch bend.
"""
import time
import random
import adafruit_ble
from adafruit_ble.advertising.standard import ProvideServicesAdvertisement
import adafruit_ble_midi
import adafruit_midi
from adafruit_midi.control_change import ControlChange
from adafruit_midi.note_off import NoteOff
from adafruit_midi.note_on import NoteOn
from adafruit_midi.pitch_bend import PitchBend
# Use default HID descriptor
midi_service = adafruit_ble_midi.MIDIService()
advertisement = ProvideServicesAdvertisement(midi_service)
# advertisement.appearance = 961
ble = adafruit_ble.BLERadio()
if ble.connected:
    for c in ble.connections:
        c.disconnect()
midi = adafruit_midi.MIDI(midi_out=midi_service, out_channel=0)
print("advertising")
ble.start_advertising(advertisement)
while True:
    print("Waiting for connection")
    while not ble.connected:
        pass
    print("Connected")
    while ble.connected:
        midi.send(NoteOn(44, 120))  # G sharp 2nd octave
        time.sleep(0.25)
        a_pitch_bend = PitchBend(random.randint(0, 16383))
        midi.send(a_pitch_bend)
        time.sleep(0.25)
        # note how a list of messages can be used
        midi.send([NoteOff("G#2", 120), ControlChange(3, 44)])
        time.sleep(0.5)
    print("Disconnected")
    print()
    ble.start_advertising(advertisement)

Documentation

API documentation for this library can be found on Read the Docs.

For information on building library documentation, please check out this guide.

Contributing

Contributions are welcome! Please read our Code of Conduct before contributing to help this project stay welcoming.