#include <Keyboard.h>

void setup() {
  pinMode(2, INPUT_PULLUP);
  pinMode(3, INPUT_PULLUP);
  pinMode(4, INPUT_PULLUP);
  pinMode(5, INPUT_PULLUP);
  pinMode(6, INPUT_PULLUP);
  pinMode(7, INPUT_PULLUP);
  pinMode(8, INPUT_PULLUP);
  pinMode(9, INPUT_PULLUP);
  pinMode(10, INPUT_PULLUP);
  pinMode(14, INPUT_PULLUP);
  pinMode(15, INPUT_PULLUP);
  pinMode(16, INPUT_PULLUP);
  pinMode(18, INPUT_PULLUP);
  pinMode(19, INPUT_PULLUP);
  pinMode(20, INPUT_PULLUP);
  pinMode(21, INPUT_PULLUP);
}

void loop() {
  Keyboard.begin();
  if (digitalRead(2) == 0)
  {
    Keyboard.press(KEY_F13);
  }
  else if (digitalRead(2) == 1) {
    Keyboard.release(KEY_F13);
  }

  if (digitalRead(3) == 0) {
    Keyboard.press(KEY_F14);
  }
  else if (digitalRead(3) == 1) {
    Keyboard.release(KEY_F14);
  }

  if (digitalRead(4) == 0) {
    Keyboard.press(KEY_F15);
  }
  else if (digitalRead(4) == 1) {
    Keyboard.release(KEY_F15);
  }

  if (digitalRead(5) == 0) {
    Keyboard.press(KEY_F16);
  }
  else if (digitalRead(5) == 1) {
    Keyboard.release(KEY_F16);
  }

  if (digitalRead(6) == 0)
  {
    Keyboard.press(KEY_F17);
  }
  else if (digitalRead(6) == 1) {
    Keyboard.release(KEY_F17);
  }

  if (digitalRead(7) == 0) {
    Keyboard.press(KEY_F18);
  }
  else if (digitalRead(7) == 1) {
    Keyboard.release(KEY_F18);
  }

  if (digitalRead(8) == 0) {
    Keyboard.press(KEY_F19);
  }
  else if (digitalRead(8) == 1) {
    Keyboard.release(KEY_F19);
  }

  if (digitalRead(9) == 0) {
    Keyboard.press(KEY_F20);
  }
  else if (digitalRead(9) == 1) {
    Keyboard.release(KEY_F20);
  }

  if (digitalRead(10) == 0)
  {
    Keyboard.press(KEY_F21);
  }
  else if (digitalRead(10) == 1) {
    Keyboard.release(KEY_F21);
  }

  if (digitalRead(14) == 0) {
    Keyboard.press(KEY_F22);
  }
  else if (digitalRead(14) == 1) {
    Keyboard.release(KEY_F22);
  }

  if (digitalRead(15) == 0) {
    Keyboard.press(KEY_F23);
  }
  else if (digitalRead(15) == 1) {
    Keyboard.release(KEY_F23);
  }

  if (digitalRead(16) == 0) {
    Keyboard.press(KEY_F24);
  }
  else if (digitalRead(16) == 1) {
    Keyboard.release(KEY_F24);
  }

  if (digitalRead(18) == 0)
  {
    Keyboard.press(KEY_F5);
  }
  else if (digitalRead(18) == 1) {
    Keyboard.release(KEY_F5);
  }

  if (digitalRead(19) == 0)
  {
    Keyboard.press(KEY_F6);
  }
  else if (digitalRead(19) == 1) {
    Keyboard.release(KEY_F6);
  }

  if (digitalRead(20) == 0)
  {
    Keyboard.press(KEY_F7);
  }
  else if (digitalRead(20) == 1) {
    Keyboard.release(KEY_F7);
  }

  if (digitalRead(21) == 0)
  {
    Keyboard.press(KEY_F8);
  }
  else if (digitalRead(21) == 1) {
    Keyboard.release(KEY_F8);
  }

  Keyboard.end();
}