#include <Keypad.h>

const byte ROWS = 3;
const byte COLS = 3;
char hexaKeys[ROWS][COLS] = {
{'1','2','3'}, 
{'4','5','6'},
{'7','8','9'}
};

byte rowPins[ROWS] = {A0, A1, A2};
byte colPins[COLS] = {A3, A4, A5};

Keypad customKeypad = Keypad( makeKeymap(hexaKeys), rowPins, colPins, ROWS, COLS);

void setup() {
  Serial.begin(9600);
  Serial.println("salam");
}

void loop() {
  char customKey = customKeypad.getKey();

  if (customKey){
    Serial.println(customKey);
  }
}