/*
references: Lesson_23
*/
#include <Keypad.h>
 
const byte ROWS = 4;
const byte COLS = 4;
char hexaKeys[ROWS][COLS] = 
{
  {'1','2','3','A'},
  {'4','5','6','B'},
  {'7','8','9','C'},
  {'*','0','#','D'}
};
byte rowPins[ROWS] = {13, 12, 11, 10}; //connect to the row pinouts of the keypad
byte colPins[COLS] = {9, 8, 7, 6}; //connect to the column pinouts of the keypad
 
Keypad customKeypad = Keypad(makeKeymap(hexaKeys), rowPins, colPins, ROWS, COLS); 
 
void setup(){
  Serial.begin(9600);//Open serial
}
   
void loop(){
  
  char customKey = customKeypad.getKey(); 
  if (customKey){
    Serial.println(customKey);
  }
  
  
}