from machine import Pin
import utime

data_pin = Pin(2, Pin.OUT)   # GP0 - DS
clock_pin = Pin(3, Pin.OUT)  # GP1 - SHCP
latch_pin = Pin(4, Pin.OUT)  # GP2 - STCP

def enviar_datos(valor):
    bits = [((valor >> i) & 1) for i in range(8)]
    for bit in reversed(bits):
        data_pin.value(bit)
        clock_pin.on()
        clock_pin.off()

def actualizar_registro():
    latch_pin.on()
    latch_pin.off()

# Probar el 74HC595
for i in range(256):
    enviar_datos(i)
    actualizar_registro()
    utime.sleep_ms(500)