from machine import Pin
from time import sleep
LED1=Pin(1,Pin.OUT)
LED2=Pin(11,Pin.OUT)
LED3=Pin(28,Pin.OUT)
LED4=Pin(18,Pin.OUT)
while True:
    LED1.value(1)
    sleep(1)
    LED2.value(1)
    sleep(2)
    LED3.value(1)
    sleep(3)
    LED4.value(1)
    sleep(4)
    LED1.value(0)
    sleep(1.5)
    LED2.value(0)
    sleep(2.5)
    LED3.value(0)
    sleep(3.5)
    LED4.value(0)
    sleep(4.5)