from machine import Pin, PWM
import time
# 設定蜂鳴器腳位
buzzer = PWM(Pin(28))
while True:
# 高音
buzzer.freq(1000) # 頻率 1000Hz
buzzer.duty_u16(30000) # 音量(0~65535)
time.sleep(0.5)
# 低音
buzzer.freq(600) # 頻率 600Hz
buzzer.duty_u16(30000)
time.sleep(0.5)