Arduino code for interfacing 4x4 Matrix Keypad with Arduino UNO and displaying the result on 16x2 LCD Display.

Arduino_4x4_Keypad_Interface.ino

#include <Keypad.h>
#include <LiquidCrystal.h>

const byte ROWS = 4; //four rows
const byte COLS = 4; //four columns
//define the cymbols on the buttons of the keypads
char hexaKeys[ROWS][COLS] = {
                             {'1','2','3','A'},
                             {'4','5','6','B'},
                             {'7','8','9','C'},
                             {'*','0','#','D'}
                                              };
byte rowPins[ROWS] = {0, 1, 2, 3}; //connect to the row pinouts of the keypad
byte colPins[COLS] = {4, 5, 6, 7}; //connect to the column pinouts of the keypad

//initialize an instance of class NewKeypad
Keypad customKeypad = Keypad( makeKeymap(hexaKeys), rowPins, colPins, ROWS, COLS); 
LiquidCrystal lcd(13, 12, 11, 10, 9, 8);


void setup() 
{
  lcd.begin(16, 2);
  lcd.print("Electronics Hub");
  delay(2000);
  lcd.clear();
  lcd.setCursor(0, 0);
}


void loop()
{
  
  char customKey = customKeypad.getKey();
  
  if (customKey) 
  {
    lcd.print(customKey);
  }
}