from machine import Pin
from time import sleep 
LED1=Pin(1,Pin.OUT)
LED2=Pin(2,Pin.OUT)
LED3=Pin(3,Pin.OUT)


while True:
    LED1.value(1)
    sleep(0.2)
    LED2.value(1)
    sleep(0.5)
    LED3.value(1)
    sleep(0.7)
    LED1.value(0)
    LED2.value(0)
    LED3.value(0)
    sleep(0.7)