from machine  import Pin
import utime

red = Pin(16, Pin.OUT)
green = Pin(18, Pin.OUT)
blue = Pin(20, Pin.OUT)

#def countdown():
while True:
    red.value(0) # red
    green.value(1)
    blue.value(1)
    utime.sleep(1)
    red.value(0) # yellow
    green.value(0)
    blue.value(1)
    utime.sleep(1)
    red.value(1) # green
    green.value(0)
    blue.value(1)
    utime.sleep(1)
    for i in range(8):
        red.value(1) 
        green.value(1)
        blue.value(1)
        utime.sleep(0.1)
        red.value(1)
        green.value(0)
        blue.value(1)
        utime.sleep(0.1)
  
    utime.sleep(1)

#countdown()