Using Digilent Pmod Keypad and LCD with Arduino Uno

/************************************************************************

  Test of the Pmods KYPD and CLS

*************************************************************************

  Description: Pmod_KYPD_CLS
  Buttons pressed will be shown on the LCD

  Material
  1. Arduino Uno
  2. Pmod KYPD
  3. Pmod CLS
  http://playground.arduino.cc/Code/Keypad

  Wiring
  KYPD<----------> Arduino <--------> CLS
  VCC        to                5V        to      VCC
  GND       to               GND      to      GND
  -              to               13         to      RX
  COL4      to               9           to       -
  COL3      to               8           to       -
  COL2      to               7           to       -
  COL1      to               6           to       -
  ROW4    to               5           to       -
  ROW3    to               4           to       -
  ROW2    to               3           to       -
  ROW1    to               2           to       -

************************************************************************/

#include <SoftwareSerial.h> //include libraries
#include <Keypad.h>

SoftwareSerial lcd(12, 13); //define object for LCD.  RX is pin 12 and TX is pin 13. We don't need to connect RX pin 12 from Arduino Uno to Pmod CLS. 

byte row_pins[] = {2, 3, 4, 5}; //row pins of the keypad
byte column_pins[] = {6, 7, 8, 9}; //column pins of the keypad

//Declaration of the keys of the keypad
char hexaKeys[sizeof(row_pins) / sizeof(byte)][sizeof(column_pins) / sizeof(byte)] =
{
  {'1', '2', '3', 'A'},
  {'4', '5', '6', 'B'},
  {'7', '8', '9', 'C'},
  {'0', 'F', 'E', 'D'}
};

Keypad kypd = Keypad( makeKeymap(hexaKeys), row_pins, column_pins, sizeof(row_pins) / sizeof(byte), sizeof(column_pins) / sizeof(byte)); //define object for the keypad

int counter = 0;  //variable to count keypresses

void setup()
{
  lcd.begin(9600); // initialization of serial communication of LCD display
  lcd.write("\x1b[j"); // Erase display. Use the command in Pmod CLS
  lcd.write("\x1b[0h"); // configuration of the display (write on 2 lines). Use the command in Pmod CLS
  lcd.write("\x1b[0;0H"); // cursor is on line 1 and columm 1. Use the command in Pmod CLS
}

void loop()
{
  char current_key = kypd.getKey();  //get keypad state
  if (current_key != 0) { //if a key is pressed
    counter++;  //increment counter
    if (counter == 33) { //if the LCD is full
      counter = 1;  //reset counter
      lcd.write("\x1b[j"); // Erase display
      lcd.write("\x1b[0;0H"); // cursor is on line 1 and columm 1
    }
    lcd.print(current_key); //display key
  }
}