import machine
from machine import Pin, Timer
import time
from time import sleep

SerA = machine.Pin(32)
SerB = machine.Pin(33)
SerC = machine.Pin(22)
SerD = machine.Pin(23)

pwmSerA = machine.PWM(SerA)
pwmSerB = machine.PWM(SerB)
pwmSerC = machine.PWM(SerC)
pwmSerD = machine.PWM(SerD)

pwmSerA.freq(50)
pwmSerB.freq(50)
pwmSerC.freq(50)
pwmSerD.freq(50)

Key_Up = const(0)
Key_Down = const(1)

Numpad = [['1', '2', '3'],
    ['4', '5', '6'],
    ['7', '8', '9'],
    ['*', '0', '#']]

Rows = [19, 18, 5, 17]
Cols = [16, 4, 0]

pines_Rows = [Pin(pin_name, mode = Pin.OUT) for pin_name in Rows]

pines_Cols = [Pin(pin_name, mode = Pin.IN, pull = Pin.PULL_DOWN) for pin_name in Cols]

def Start():
    for Row in range(0, 4):
        for Col in range(0, 3):
            pines_Rows[Row].value(0)

def Scan(Row, Col):
    """ Escaneo de teclado """
    pines_Rows[Row].value(1)
    key = None

    if pines_Cols[Col].value() == Key_Down:
        key = Key_Down

    if pines_Cols [Col].value() == Key_Up:
        key = Key_Up
    pines_Rows[Row].value(0)

    return key

print("iniciando .............Presione una tecla: ")
    
Start()

while True:
    for Row in range(4):
        for Col in range(3):
            Key = Scan(Row, Col)
            if Key == Key_Down:
                print("Tecla: ", Numpad[Row][Col])
                last_key_press = Numpad[Row][Col]
                if Numpad[Row][Col] != '1':
                    pwmSerA.duty(25)
                    pwmSerB.duty(25)
                    pwmSerC.duty(25)
                    pwmSerD.duty(25)
                    print("CLOSE")
                else:
                    pwmSerA.duty(75)
                    pwmSerB.duty(75)
                    pwmSerC.duty(75)
                    pwmSerD.duty(75)
                    print("OPEN")
                sleep(0.2)