from machine import Pin, PWM
import utime

melody_buzzer = PWM(Pin(19, Pin.OUT), freq=1, duty=512)
melody_buzzer.duty(0)

frequency_list = [261, 293, 329, 349, 392, 440, 493, 523]

while True:
    for frequency in frequency_list:
        melody_buzzer.duty(512)
        melody_buzzer.freq(int(frequency)) # 실수형이라도 정수형으로 바꿈
        utime.sleep_ms(500)
        melody_buzzer.duty(0)
        utime.sleep_ms(100)