int col[] = {2,3};
int row[] = {4,5};

const int NUM_COLS = sizeof(col) / sizeof(col[0]); //stevilo col pinov
const int NUM_ROWS = sizeof(row) / sizeof(row[0]); //stevilo row pinov

bool LBS[NUM_COLS][NUM_ROWS]; //array za last button state

void setup() {
Serial.begin(9600);

for (int i = 0; i < NUM_COLS; i++){
  pinMode(col[i], OUTPUT);     //vse col da na out
  digitalWrite(col[i], HIGH);  //vse col da na high(inactive)
}
for (int j = 0; j < NUM_ROWS; j++){
  pinMode(row[j], INPUT_PULLUP);  //vse row da na inpul
}

for (int i = 0; i < NUM_COLS; i++) {  //cel LBS array zapise kot 0
  for (int j = 0; j < NUM_ROWS; j++) {
    LBS[i][j] = false;
  }
}
}

void loop() {

for (int a = 0; a < NUM_COLS; a++){  //ciklira med col
  digitalWrite(col[a], LOW); //ta col da na low (za branje)
 //           pr vsakmu col nardi:
  for (int b = 0; b < NUM_ROWS; b++){  //ciklira med row
   //na vsaki tocki v array se nardi:
    bool CBS = (digitalRead(row[b]) == LOW); //current button state

    if (CBS != LBS[a][b]) { //ce se trenutni pritisnjen gump razlikuje od prej
      if (CBS) {
        // gump je bil pritisnjen
        Serial.print("btn");
        Serial.print((a * NUM_ROWS) + b + 1); //enacba za array gumb
        Serial.println(",on");
      } else {
        // gumb je bil spuscen
        Serial.print("btn");
        Serial.print((a * NUM_ROWS) + b + 1);
        Serial.println(",off");
      }
      LBS[a][b] = CBS;
    }    
  }
  digitalWrite(col[a], HIGH); //ta col da nazaj na high po branju
}
delay(5); //debounce
}