3 Sound Modes for the BBC Microbit

microbit_module.py

import speech
import random
import music
import time
import math
from microbit import pin1, pin2, display, button_a, button_b, sleep

# See https://www.youtube.com/watch?v=DOlMiNbmLWg

def scale(x, lo1, hi1, lo2, hi2) :
    if lo1 == hi1 : return lo2
    if x == 0 : return 0
    return ((float(math.log(x)-math.log(lo1)) / (math.log(hi1)-math.log(lo1))) * (hi2-lo2))+lo2
      

class CalibratedParameter :
    
    def __init__(self,min=10000,max=-100000) :
        self.min = min
        self.max = max
        self.val = 0
        self.changed = False
        self.threshold = 2
        
    def set(self,x) :
        if abs(x - self.val) > self.threshold :
            self.changed = True
        self.val = x
      

        if x > self.max : 
            self.max = x
        if x < self.min :
            self.min = x

    def projectTo(self,targetLo,targetHi) :
        return scale(self.val, self.min, self.max, targetLo, targetHi)

    def safeProjectTo(self,targetLo,targetHi) :
        x = int(self.projectTo(targetLo,targetHi))
        if x == targetHi : 
            x = x - 1
        return x
        
    def getVal(self) :
        return self.val

    def isChanged(self) :
        c = self.changed
        self.changed = False
        return c
        
    def report(self) :
        return "%s in %s -- %s" % (self.val,self.min,self.max)
        
V1 = CalibratedParameter()
V2 = CalibratedParameter()

solfa = [
            "#115DOWWWWWW",   # Doh
            "#103REYYYYYY",   # Re
            "#94MIYYYYYY",    # Mi
            "#88FAOAOAOAOR",  # Fa
            "#78SOHWWWWW",    # Soh
            "#70LAOAOAOAOR",  # La
            "#62TIYYYYYY",    # Ti
            "#58DOWWWWWW",    # Doh
        ]

phones = ["uy", "ui", "nt", "ui"]


pot1 = pin1
pot2 = pin2

mode = 0
wait = 50


def make_phasor(n) :
    x=0
    yield x
    while True :
        x = (x + 1) % n
        yield x

phas1 = make_phasor(len(phones))

while (True) :
    
    # Input Handlers
    
    if button_a.is_pressed():
        wait=((wait+100) % 600)+50
        display.set_pixel(0,0,5)

    if button_b.is_pressed():
        mode = (mode + 1) % 4
        display.set_pixel(4,0,5)

    V1.set(pot1.read_analog())
    V2.set(pot2.read_analog())
    
    print("%s, %s" % (V1.report(),V2.report()))
    
    # Output
    
    display.clear()

    # Mode Handlers        
        
    if mode == 0 :
        display.set_pixel(V1.safeProjectTo(0,5),mode,4)        
        display.set_pixel(V1.safeProjectTo(0,5),V2.safeProjectTo(0,5),3)
        sleep(wait)

        
    if mode == 1 :
        display.set_pixel(V1.safeProjectTo(0,5),mode,5)
        if (V1.safeProjectTo(0,1200) > 1000) :
            freq = random.randint(200,1000)
        else:           
            freq = int(V1.projectTo(0,1000))
        wait = V2.safeProjectTo(30,1000)

        music.pitch(freq, duration=wait)
        sleep(wait)
        
    if mode == 2 :
        display.set_pixel(V1.safeProjectTo(0,5),mode,5)

        index = V1.safeProjectTo(0,8)
        wait = V2.safeProjectTo(30,300)
        
        speech.sing(solfa[index], speed=wait)
        sleep(wait)

    if mode == 3 :
        display.set_pixel(V1.safeProjectTo(0,5),mode,5)

        s = V1.safeProjectTo(0,255)
        p = V2.safeProjectTo(0,255)
        t = random.randint(1,255)
        m = random.randint(1,255)

        speech.say(phones[next(phas1)], speed=s, pitch=p, throat=t, mouth=m)
        sleep(wait)