from machine import Pin, PWM
import time
beeper = PWM(Pin(27, Pin.OUT))
notes = [523, 523, 587, 523, 698, 659, 
         523, 523, 587, 523, 784, 698,
         523, 523, 1046, 880, 698, 659, 587,  
         932, 932, 880, 698, 784, 698]
for note in notes:
  if note == 0:
    beeper.duty(0)
  else:
    beeper.duty(512)  #音量，最大為1024
    beeper.freq(note)
  time.sleep(0.2)
  beeper.duty(0)
  time.sleep(0.1)