/*
Demonstrate a basic matrix
Diodes : no
Ghosting : limited
https://wokwi.com/projects/400921600619685889

https://github.com/Chris--A/Keypad/blob/master/examples/MultiKey/MultiKey.ino
*/

#include <Keypad.h>

const byte ROWS = 5;
const byte COLS = 5;

byte rowPins[ROWS] = {2,3,4,5,6};
byte colPins[COLS] = {8,9,10,11,12};

char customKeys[ROWS][COLS] = 
{
  { 'q',NO_KEY,'d','v',NO_KEY},
  { NO_KEY,'w',NO_KEY,'f','b'},
  { 'a','x',NO_KEY,'r',NO_KEY},
  { NO_KEY,'s','c',NO_KEY,'t'},
  { 'z',NO_KEY,'e',NO_KEY,'g'}
};

Keypad kpd = Keypad( makeKeymap(customKeys), rowPins, colPins, ROWS, COLS); 

void setup() {
    Serial.begin(9600);
    Serial.print("listening...");
}

void loop() {
    if (kpd.getKeys())
    {
        for (int i=0; i<LIST_MAX; i++)   // Scan the whole key list.
        {
            if ( kpd.key[i].stateChanged )   // Only find keys that have changed state.
            {
                switch (kpd.key[i].kstate) {  // Report active key state : IDLE, PRESSED, HOLD, or RELEASED
                    case PRESSED:
                    if(kpd.key[i].kchar != NO_KEY){
                      Serial.print(kpd.key[i].kchar);
                    }
                }
            }
        }
    }
}  // End loop