/*
author  : Rajeev TR
date    : 30/08/2024
https://github.com/HoNtErBoT
*/


#include <Keypad.h>

// Define the number of rows and columns on the keypad
const byte ROWS = 4;
const byte COLS = 4;

// Define the keymap for your keypad
char keys[ROWS][COLS] = {
  {'1','2','3','A'},
  {'4','5','6','B'},
  {'7','8','9','C'},
  {'*','0','#','D'}
};


byte rowPins[ROWS] = {2, 3, 4, 5};   // Connect keypad ROW0, ROW1, ROW2, ROW3 to Arduino pins 2, 3, 4, 5
byte colPins[COLS] = {6, 7, 8, 9};   // Connect keypad COL0, COL1, COL2, COL3 to Arduino pins 6, 7, 8, 9
Keypad keypad = Keypad(makeKeymap(keys), rowPins, colPins, ROWS, COLS);      // Create the Keypad object

void setup() 
{
  Serial.begin(9600);               // Initialize the serial communication
}

void loop() 
{
  char key = keypad.getKey();       // Read the key
  if (key)
  {
      Serial.println(key); // Print the key pressed to the serial monitor
  }
}