// https://wokwi.com/projects/419438907998692353

# include <Key.h>
# include <Keypad.h>

const byte ROWS = 4;
const byte COLS = 4;

char keyMatrix[ROWS][COLS] = {
 {'A', 'B', 'C', 'D'},
 {'E', 'F', 'G', 'H'},
 {'J', 'I', 'K', 'L'},
 {'M', 'N', 'O', 'P'},
};

byte rowPins[ROWS] = {46, 47, 48, 49};
byte colPins[COLS] = {50, 51, 52, 53};

Keypad myKeypad = Keypad(makeKeymap(keyMatrix), rowPins, colPins, ROWS, COLS);

void setup() {
  Serial.begin(9600);
  Serial.println("\nJello Whirled!\n");

  DDRF = 0xf0;
}

void loop() {

  char theKeyPress = myKeypad.getKey();

  if (theKeyPress) { 
    Serial.println(theKeyPress);

    PORTF &= 0xf0;
    PORTF |= theKeyPress - 'A';
  }
}