from machine import Pin
import time

# Pines de conexión al 74HC595
DATA = Pin(15, Pin.OUT)   # DS
LATCH = Pin(13, Pin.OUT)  # ST_CP
CLOCK = Pin(14, Pin.OUT)  # SH_CP

# Tabla de segmentos (común cátodo)
# Bit 0 -> a, Bit 1 -> b, ..., Bit 6 -> g
digits = [
    0b00111111,  # 0
    0b00000110,  # 1
    0b01011011,  # 2
    0b01001111,  # 3
    0b01100110,  # 4
    0b01101101,  # 5
    0b01111101,  # 6
    0b00000111,  # 7
    0b01111111,  # 8
    0b01101111   # 9
]

def shift_out(value):
    """Envía 8 bits al 74HC595"""
    for i in range(8):
        bit = (value >> (7 - i)) & 1
        DATA.value(bit)
        CLOCK.value(1)
        CLOCK.value(0)

def display_number(num):
    """Muestra un dígito (0–9)"""
    LATCH.value(0)
    shift_out(digits[num])
    LATCH.value(1)

# --- Programa principal ---
while True:
    for n in range(10):
        display_number(n)
        print("Mostrando:", n)
        time.sleep(1)