from machine import Pin
import utime
Ledgreen = Pin(0, Pin.OUT)
Ledyellow =Pin(3, Pin.OUT)
Ledred =Pin(8, Pin.OUT)
#MAIN
while True:
    Ledgreen.value(2.5)
    utime.sleep(2.5)
    Ledgreen.value(0)
    utime.sleep(0)

    Ledyellow.value(2.5)
    utime.sleep(2.5)
    Ledyellow.value(0)
    utime.sleep(0)

    Ledred.value(2.5)
    utime.sleep(2.5)
    Ledred.value(0)
    utime.sleep(0)

    Ledyellow.value(2.5)
    utime.sleep(2.5)
    Ledyellow.value(0)
    utime.sleep(0)