from machine import Pin
import utime
red =Pin(2,Pin.OUT)
green=Pin(3,Pin.OUT)
blue =Pin(4,Pin.OUT)
while True:
    red.value(1)
    utime.sleep(1)
    red.value(0)
    green.value(1)
    utime.sleep(1)
    green.value(0)
    blue.value(1)
    utime.sleep(1)
    blue.value(0)
    utime.sleep(1)