/*
Demonstrate a basic matrix
Diodes : no
Ghosting : yes
https://wokwi.com/projects/400927180393138177
*/

#include <Keypad.h>

const byte ROWS = 3;
const byte COLS = 5;


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

byte rowPins[ROWS] = {2,3,6};
byte colPins[COLS] = {4,5,7,8,9};

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:
                      Serial.print(kpd.key[i].kchar);
                }
            }
        }
    }
}  // End loop