#include <Keyboard.h>

int btnPins[] = {5,4,3,2,6};
char btnKeys[] = {'y', 'r', 'a', 'n', 'q'};
bool state;

char ctrlKey = KEY_LEFT_GUI;

void setup() {

  for (int i = 0; i < 5; i++) {
    pinMode(btnPins[i], INPUT_PULLUP);
    Keyboard.begin();
  }

  if (btnPins[4] == LOW) state = true;
  if (btnPins[4] == HIGH) state = false;

}

void loop(){

  for (int i = 0; i < 4; i++) {
    if (digitalRead(i) == LOW) {
      PressKey(btnKeys[i]);
    }
  }

  if ((digitalRead(btnPins[4]) == LOW && state == false) || (digitalRead(btnPins[4]) == HIGH && state == true)) {
    PressKey(btnKeys[4]);
    state = !state;
  }

}

void PressKey(char key) {
  Keyboard.press(key);
  delay(200);
  Keyboard.release(key);
  delay(500);
}