from machine import *
from utime import *
from neopixel import NeoPixel

np = NeoPixel(Pin(22), 16)

for i in range(16):
    np[i] = 255, 0, 0
np.write()

NOTES = ('a', 'a#', 'b', 'c', 'c#', 'd', 'd#', 'e', 'f', 'f#', 'g', 'g#')

buz_pin = 33

def freq(note):
    if len(note) == 3:
        octave = int(note[2])
    else:
        octave = int(note[1])
        
    key_no = NOTES.index(note[:-1])
    
    if key_no < 3:
        key_no = key_no + 12 + ((octave - 1) * 12) + 1
    else:
        key_no = key_no + ((octave - 1) * 12) + 1
        
    return 440 * (2 ** ((key_no - 49) / 12))

def tone(pin, freq, time):
    buzzer = PWM(Pin(pin), freq=freq, duty=512)
    sleep_ms(time)
    buzzer.deinit()
song = ['d3', 'd3', 'e3', 'd3', 'f#3']

for note in song:
    tone(buz_pin, int(freq(note)), 300)
    sleep_ms(100)