import smbus
import time
from pad4pi import rpi_gpio

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

ROW_PINS = [4, 14, 15, 17] # BCM numbering
COL_PINS = [18, 27, 22] # BCM numbering

factory = rpi_gpio.KeypadFactory()

# Try factory.create_4_by_3_keypad
# and factory.create_4_by_4_keypad for reasonable defaults
keypad = factory.create_keypad(keypad=KEYPAD, row_pins=ROW_PINS, col_pins=COL_PINS)

def printKey(key):
    try:
        writeNumber(key)
        print('Wyslano do Arduino: ', key)
        number = readNumber()
        print('Potwierdzenie od Arduino, odebrano: ', number)
        print
    except:
        keypad.cleanup



keypad.registerKeyPressHandler(printKey)

# for RPI version 1, use "bus = smbus.SMBus(0)"
bus = smbus.SMBus(1)

# This is the address we setup in the Arduino Program
address = 0x04

def writeNumber(value):
 bus.write_byte(address, value)
# bus.write_byte_data(address, 0, value)
 return -1

def readNumber():
 number = bus.read_byte(address)
# number = bus.read_byte_data(address, 1)
 return number

while (True):
    time.sleep(0.2)