play random melody in scale, w/ LEDS & LCD accompaniment (CircuitPython on Adafruit FunHouse) video: https://twitter.com/todbot/status/1416139823383941120

random_notes_scale2.py

# random_notes_scale2.py - play random melody in scale, w/ LEDS & LCD accompaniment
# 16 Jul 2021 - @todbot
import time, random, math
import board, digitalio, pwmio
import adafruit_dotstar  # or neopixel
import displayio, terminalio
from adafruit_display_text import label
leds = adafruit_dotstar.DotStar(board.DOTSTAR_CLOCK, board.DOTSTAR_DATA, 5, brightness=0.1)
mylabel = label.Label(terminalio.FONT, text="Music???", x=40,y=50, scale=4, color=0xff00ff)
display = board.DISPLAY
display.rotation=0
display.show(mylabel)
f0 = 220 # A3
fr = 2**(1/12) # freqency spacing between notes, approx 1.06
scale = ( 0, 2, 4, 5, 7, 9, 10)  # mixolydian
out1 = pwmio.PWMOut(board.SPEAKER,frequency=f0,duty_cycle=45000,variable_frequency=True)
while True:
    octave = random.randint(-1,1)
    nsemi = random.choice(scale) - 5 + 12*octave # pick random semitone from scale
    f_new = min(max(f0 * fr**nsemi, f0//2), f0*4) # get new note freqency, A2 to A5, approx
    out1.frequency = int(f_new)
    crand = int(random.randint(0,0xffffff)) # random color 
    leds[ int(f_new) % len(leds) ] = crand  # put rand color on LED based on frequency
    print(time.monotonic(),out1.frequency,nsemi,octave)
    mylabel.x = random.randint(5,50)   # move label around a bit for fun
    mylabel.y = random.randint(10,200)
    mylabel.color = crand
    display.refresh()
    time.sleep(0.12)