print("Hello, ESP32!")
import time
from machine import Pin, PWM

# 创建 LED 控制对象
led = Pin(12,Pin.OUT)
led1 = Pin(14,Pin.OUT)
led2 = Pin(15,Pin.OUT)
led3 = Pin(2,Pin.OUT)

leds = [led,led1,led2,led3]

while True:
    for n in range(4):
        leds[n].off()
    for n in range(4):
        leds[n].on()
        time.sleep_ms(50)
        leds[n].off()
        time.sleep_ms(50)