import machine
import time

data = machine.Pin(27,machine.Pin.OUT)
latch = machine.Pin(26,machine.Pin.OUT)
clock = machine.Pin(22,machine.Pin.OUT)

renglones = [machine.Pin(p, machine.Pin.OUT) for p in range(12,16)]
columnas = [machine.Pin(p, machine.Pin.IN,machine.Pin.PULL_DOWN) for p in range(16,20)]



digits = [
    [1, 1, 1, 1, 1, 1, 0, 0], 
    [0, 1, 1, 0, 0, 0, 0, 0],
    [1, 1, 0, 1, 1, 0, 1, 0],
    [1, 1, 1, 1, 0, 0, 1, 0],
    [0, 1, 1, 0, 0, 1, 1, 0],
    [1, 0, 1, 1, 0, 1, 1, 0],
    [1, 0, 1, 1, 1, 1, 1, 0],
    [1, 1, 1, 0, 0, 0, 0, 0],
    [1, 1, 1, 1, 1, 1, 1, 0],
    [1, 1, 1, 0, 0, 1, 1, 0],
    [1, 1, 1, 0, 1, 1, 1, 0],
    [0, 0, 1, 1, 1, 1, 1, 0],
    [1, 0, 0, 1, 1, 1, 0, 0],
    [0, 1, 1, 1, 1, 0, 1, 0],
]

letras = [
    ["1","2","3","A"],
    ["4","5","6","B"],
    ["7","8","9","C"],
    ["*","0","#","D"]
]

def leer_tecla():
    for r in range(4):
        renglones[r].value(1)
        for c in range(4):
            if columnas[c].value():
                renglones[r].value(0)
                return letras[r][c]
        renglones[r].value(0)
    return("")

def mostrar_tecla(letra):
    if (letra != "*" and letra != "#" and letra != ""):
        mostrar = 0
        if (letra == "A"):
            mostrar= 10
        if (letra == "B"):
            mostrar = 11
        if (letra == "C"):
            mostrar = 12
        if (letra == "D"):
            mostrar = 13
        if letra == "0":
            mostrar = 0
        if letra == "1":
            mostrar = 1
        if letra == "2":
            mostrar = 2
        if letra == "3":
            mostrar=3
        if letra == "4":
            mostrar=4
        if letra == "5":
            mostrar=5
        if letra == "6":
            mostrar=6
        if letra == "7":
            mostrar=7
        if letra == "8":
            mostrar=8
        if letra == "9":
            mostrar=9

        latch.value(0)
        datos=digits[mostrar]

        for x in datos:
            data.value(x)
            clock.value(1)
            clock.value(0)
        latch.value(1)

while True:
    letra = leer_tecla()
    mostrar_tecla(letra)
    time.sleep(0.005)