from utime import sleep
from machine import Pin

sleep(0.1) # Wait for USB to become ready

print("Hello, Pi Pico!")

'''
d0 = Pin(0, Pin.OUT)
d1 = Pin(26, Pin.OUT)
d2 = Pin(27, Pin.OUT)
d3 = Pin(28, Pin.OUT)

digits = (d0, d1, d2, d3)
'''

pins = (0, 26, 27, 28)
digits = [Pin(p, Pin.OUT) for p in pins]

while True:
  for x in digits:
    for y in range(2):
      x.toggle()
      sleep(0.1)