from machine import Pin #从机械输出pin（引脚）
import time
led_1 = Pin(16,Pin.OUT)  #定义一个端口（引脚5）为输出端口（out）并赋值给变量led_1
led_2 = Pin(17,Pin.OUT)
led_3 = Pin(5,Pin.OUT)
led_4 = Pin(18,Pin.OUT)
led_5 = Pin(19,Pin.OUT)

while 1:
    led_1.value(1)
    time.sleep(1)
    led_1.value(0)
    time.sleep(1)
    led_2.value(1)
    time.sleep(1)
    led_2.value(0)
    time.sleep(1)
    led_3.value(1)
    time.sleep(1)
    led_3.value(0)
    time.sleep(1)
    led_4.value(1)
    time.sleep(1)
    led_4.value(0)
    time.sleep(1)
    led_5.value(1)
    time.sleep(1)
    led_5.value(0)
    time.sleep(1)