#include <Keypad.h>

const uint8_t ROWS = 4;
const uint8_t COLS = 4;
char keys[ROWS][COLS] = {
  { 'A', 'B', '#', '$' },
  { '%', '^', '&', '*' },
  { '1', '6', '8', '9' },
  { 'C', 'V', 'B', 'N' }
};

byte rowPins[ROWS] = {16, 4, 0, 2};
byte colPins[COLS] = {19, 18, 5, 17};

Keypad keypad = Keypad(makeKeymap(keys), rowPins, colPins, ROWS, COLS);

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

void loop() {
  char key = keypad.getKey();

  if (key != NO_KEY) {
    Serial.println(key);
  }
}