import time
import neopixel
from machine import Pin, PWM

np = neopixel.NeoPixel(Pin(22, Pin.OUT), 16)

buzzer = PWM(Pin(23))
melody = [262, 294, 330, 349, 392, 440, 494, 523]  

def crossfade(color1, color2, steps):
    r_step = (color2[0] - color1[0]) / steps
    g_step = (color2[1] - color1[1]) / steps
    b_step = (color2[2] - color1[2]) / steps
    for i in range(steps):
        r = color1[0] + (r_step * i)
        g = color1[1] + (g_step * i)
        b = color1[2] + (b_step * i)
        np.fill((int(r), int(g), int(b)))
        np.write()
        time.sleep(0.05)

def play_melody():
    for note in melody:
        buzzer.duty(50)
        buzzer.freq(note)
        time.sleep(0.3)
        buzzer.duty(0)
        time.sleep(0.1)

while True:
    crossfade((255, 0, 0), (0, 255, 0), 50)
    play_melody()
    crossfade((0, 255, 0), (0, 0, 255), 50)
    play_melody()
    crossfade((0, 0, 255), (255, 0, 0), 50)
    play_melody()