Arduino Code and Video 4x4 matrix black keypad

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This is the Arduino code for 4x4 keypad (black).

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Resources for this code

1. Library code for 4x4 Keypad
2. Get Schematic diagram for this sketch from Arduino Course on Udemy
3. Learn Arduino step by step from beginner to Advance (Coruse)
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 /*
 * Original sourse: https://playground.arduino.cc/Code/Keypad
 * This is the Arduino code for 4x4 black keypad
 * watch the video for details and demo https://youtu.be/1rfrvOTxtrg	
 *  * 
 * Written by Ahmad S. for Robojax Video channel www.Robojax.com
 * Date: April 15, 2018, in Ajax, Ontario, Canada
 * Permission granted to share this code given that this
 * note is kept with the code.
 * Disclaimer: this code is "AS IS" and for educational purpose only.
 * this code has been downloaded from http://robojax.com/learn/arduino/
 * 
 */
/* @file HelloKeypad.pde
|| @version 1.0
|| @author Alexander Brevig
|| @contact alexanderbrevig@gmail.com
||
|| @description
|| | Demonstrates the simplest use of the matrix Keypad library.
|| #
*/
#include <Keypad.h>

const byte ROWS = 4; //four rows
const byte COLS = 4; //three columns
char keys[ROWS][COLS] = {
  {'1','2','3','A'},
  {'4','5','6','B'},
  {'7','8','9','C'},
  {'*','0','#','D'}
};

// connect the pins from right to left to pin 2, 3, 4, 5,6,7,8,9
byte rowPins[ROWS] = {5,4,3,2}; //connect to the row pinouts of the keypad
byte colPins[COLS] = {9,8,7,6}; //connect to the column pinouts of the keypad

Keypad keypad = Keypad( makeKeymap(keys), rowPins, colPins, ROWS, COLS );

void setup(){
  Serial.begin(9600);
}
  
void loop(){
  char key = keypad.getKey();
    // just print the pressed key
   if (key){
    Serial.print("Key ");
    Serial.print(key);
    Serial.println(" is pressed");
  } 
  
  // this checks if 4 is pressed, then do something. Here  we print the text but you can control something.
  if (key =='4'){
    // do something here is 4 is pressed
    Serial.println("Key 4 is pressed -> Action");
  }
}