#include <Keyboard.h>
#include <Keypad.h>

const byte ROWS = 4; //four rows
const byte COLS = 4; //three columns
char keys[ROWS][COLS] = {
  {'1','2','3','A'},
  {'4','5','6','B'},
  {'7','8','9','C'},
  {'*','0','#','D'}
};
byte rowPins[ROWS] = {13,12,11,10}; //connect to the row pinouts of the keypad
byte colPins[COLS] = {9, 8, 7, 6}; //connect to the column pinouts of the keypad

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

bool lightsOn = false;

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

void loop(){
  char key = keypad.getKey();
  if (key != NO_KEY){
    if (key == 'A') {
      if (lightsOn) {
        lightsOn = false;
        Keyboard.print('J');
      } else {
        lightsOn = true;
        Keyboard.print('J');
        delay(200);
        Keyboard.print('J');
        delay(200);
        Keyboard.print('J');
        delay(200);
        Keyboard.print('K');
        delay(200);
        Keyboard.print('L');
      }
    } else if (key == 'B') {
      Keyboard.press('G');
      delay(200);
      Keyboard.release('G');
    } else if (key == 'C') {
      Keyboard.print('K');
    } else if (key == 'D') {
      Keyboard.print('L');
    } else if (key == '*') {
      lightsOn = false;
    }
  }
}