from time import sleep
from machine import Pin
y = Pin(0,Pin.OUT)
r = Pin(1,Pin.OUT)
while True:
    for i in range (0,3):
        y.value(1)
        y.value(0)
        sleep(0.5)
    for j in range(0,3):
        r.value(1)
        r.value(0)
        sleep(0.5)