from machine import Pin
from time import sleep 
red = Pin(6, Pin.OUT)
green = Pin(7, Pin.OUT)
blue = Pin(8, Pin.OUT)
while True:
    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)