from machine import Pin
from utime import sleep

red = Pin(0, Pin.OUT)
green = Pin(1, Pin.OUT)

def blink(pin, counter):
    for i in range(counter):
        pin.toggle()
        sleep(0.5)
        pin.toggle()
        sleep(0.5)

counter = 0

while True:
    blink(red, counter)
    blink(green, counter)
    counter += 1