print("Hello, ESP32!")
from machine import Pin
import time
# 1. 配置引脚
led = Pin(27, Pin.OUT) # LED 引脚设为输出
key = Pin(19, Pin.IN, Pin.PULL_UP) # 按键引脚设为输入+内部上拉
# 2. 主循环
while True:
if key.value() == 0: # 按下按键 → 引脚被拉低为 0
led.on() # 点亮 LED
else: # 松开按键 → 引脚恢复高电平 1
led.off() # 熄灭 LED
time.sleep(0.05) # 简易消抖 + 降低 CPU 占用