Microbit Choir

Early experiment in creating a choir for three or more microbits.

Code

from microbit import *
import radio
import music

def separate_note(note):
    return note.split(':')

def note_to_midi(note):
    note_map = {
        'C': 0, 'C#': 1, 'D': 2, 'D#': 3, 'E': 4, 'F': 5, 'F#': 6,
        'G': 7, 'G#': 8, 'A': 9, 'A#': 10, 'B': 11
    }

    # Extract the note and octave from the input
    if len(note) == 2:
        note_name = note[0]
        octave = int(note[1])
    elif len(note) == 3:
        note_name = note[:2]
        octave = int(note[2])
    else:
        raise ValueError("Invalid note format")

    # Calculate the MIDI value
    midi_value = note_map[note_name] + (octave + 1) * 12
    return midi_value

def midi_to_note_name(midi_value):
    note_names = ['C', 'C#', 'D', 'D#', 'E', 'F', 'F#', 'G', 'G#', 'A', 'A#', 'B']

    note_name = note_names[midi_value % 12]
    octave = (midi_value // 12) - 1

    return f"{note_name}{octave}"

def is_rest(note):
    return note == 'R' or note == 'r'

def harmonize(note, interval):
    parts = separate_note(note)

    if is_rest(parts[0]):
        return note

    root = note_to_midi(parts[0])
    harmony = root + interval
    harmony_note = midi_to_note_name(harmony)

    if len(parts) == 2:
        return f"{harmony_note}:{parts[1]}"

    return harmony_note

def harmonize_all(notes, interval):
    
    if interval == 0:
        return notes
    
    harmonized = []
    
    for note in notes:
        harmony = harmonize(note, interval)
        harmonized.append(harmony)
    
    return notes
  
def encode_notes_message(notes):
    commalist = ','.join(score)
    return "NOTES={}".format(commalist)

def decode_notes_message(message):
    _, notes = message.split("=")
    return notes.split(',')
    
# notes are
score = ['C4:4', 'D4:4', 'E4:4', 'F4:4', 'G4:4', 'A4:4', 'B4:4']

# choir leader
leader = False
# position = 0

# harmonizer
semi_tones = 0

wallpaper = Image.MUSIC_CROTCHET

display.scroll('Harmony')
display.show(wallpaper)

radio.on()

while True:

    if accelerometer.was_gesture('shake'):
        leader = not leader

        wallpaper = Image.ALL_ARROWS if leader else Image.MUSIC_CROTCHET
        display.show(wallpaper)
            
    if leader:
        
        # send out notes
        # send out go signal
        if button_a.was_pressed():
            message = encode_notes_message(score)
            radio.send(message)
            
        if button_b.was_pressed():
            message = "PLAY"
            radio.send(message)
    else:

        # harmonizer
        if button_a.was_pressed():
            semi_tones = max(0, semi_tones - 1)
        if button_b.was_pressed():
            semi_tones = max(semi_tones + 1, 12)

        # is this a set of notes?
        # is this a control signal
        message = radio.receive()

        if message:
            if message.startswith("NOTES"):
                score = decode_notes_message(message)
            elif message.startswith("PLAY"):
                harmony = harmonize_all(score, semi_tones)
                music.play(harmony)
            

# print(harmonize('C5', 12))