#include <I2CKeyPad.h>
#include <Keypad.h>
#include <Wire.h>
#include <LiquidCrystal_I2C.h>

#define KEYPAD_ADDR 0x20
#define LCD_ADDR 0x22

LiquidCrystal_I2C lcd(LCD_ADDR, 16, 2);

const byte ROW_NUM    = 4;  // Four rows
const byte COLUMN_NUM = 4;  // Four columns

char keys[ROW_NUM][COLUMN_NUM] = {
  {'1','2','3','A'},
  {'4','5','6','B'},
  {'7','8','9','C'},
  {'*','0','#','D'}
};
byte rowPins[ROW_NUM] = {0, 1, 2, 3};  // Assign the row pins connected to PCF8574 (P0-P3)
byte colPins[COLUMN_NUM] = {4, 5, 6, 7}; // Assign the column pins connected to PCF8574 (P4-P7)

Keypad keypad = Keypad(makeKeymap(keys), rowPins, colPins, ROW_NUM, COLUMN_NUM);


void setup()
{
  Wire.begin();
  
  // Start the Serial Monitor
  Serial.begin(9600);
  
}

void loop()
{
}