from machine import Pin,PWM
from utime import sleep

print("Hello, ESP32!")

# ✅ 初始化蜂鸣器：接在 GPIO32
buzzer = PWM(Pin(12))
buzzer.freq(623)   # 设定频率 623Hz
buzzer.duty(512)    # 设定响度（0~1023，512 是一半）

led = Pin(15, Pin.OUT)
while True:
  led.on()
  sleep(0.5)
  led.off()
  sleep(0.5)