from machine import Pin
from time import sleep
Red=Pin(16,Pin.OUT)
Green=Pin(17,Pin.OUT)
Blue=Pin(18,Pin.OUT)
while True:
    sleep(1)
    Red.value(0)
    Green.value(0)
    Blue.value(0)
    sleep(1)
    Red.value(1)
    Green.value(0)
    Blue.value(0)
    sleep(1)
    Red.value(0)
    Green.value(1)
    Blue.value(0)
    sleep(1)
    Red.value(0)
    Green.value(0)
    Blue.value(1)
    sleep(1)