from machine import Pin
import time
zelena=pin13=Pin(13, Pin.OUT)
rumena=pin15=Pin(15, Pin.OUT)
sleeptime=120
def blink(cas):
     for i in range(10):
          zelena.value(0)
          rumena.value(1)
          time.sleep_ms(cas)
          zelena.value(1)
          rumena.value(0)
          time.sleep_ms(cas)
          print(i)
blink(500)