#include <Wire.h>
//#include <LiquidCrystal_I2C.h>
#include <Keypad.h>
#include <LCD_I2C.h>
#include<stdio.h>

LCD_I2C lcd(0x27); // Default address of most PCF8574 modules, change according

const byte ROWS = 4;
const byte COLS = 10;
char data[100];
int i = 0;
char hexaKeys[ROWS][COLS] = {
  {'1', '2', '3', '4', '5', '6', '7', '8', '9', '0'},
  {'Q', 'W', 'E', 'R', 'T', 'Y', 'U', 'I', 'O', 'P'},
  {'A', 'S', 'D', 'F', 'G', 'H', 'J', 'K', 'L', 'x'},//x delete
  {'Z', 'X', 'C', 'V', 'B', 'N', 'M', ',', '.', ' '},//. send
};

byte rowPins[ROWS] = {14, 15, 16, 17};
byte colPins[COLS] = {13, 12, 11, 10, 9, 8, 7, 6, 5, 4};

Keypad customKeypad = Keypad(makeKeymap(hexaKeys), rowPins, colPins, ROWS, COLS);



void setup()
{
  lcd.begin();
  lcd.backlight();


}
void data_send() {
  lcd.setCursor(0, 1);
  lcd.print("Data send");
}

void clear() {
  i = i - 1;
  lcd.clear();
  data[i] = ' ';
  lcd.setCursor(0, 0);

  lcd.print(data);

}
void loop() {
  char customKey = customKeypad.getKey();
  if (customKey)
  {
    switch (customKey)
    {
      case '.':
        data_send();
        break;
      case 'x':
        clear();
        break;

      default:

        data[i] = customKey;
                i += 1;
        lcd.clear();
        lcd.setCursor(0, 0);
        lcd.print(data);
    }


  }
}