Simple two button control with a Teensy #3

TeensyTwoButtons.ino

/*
 * Button.pde
 *
 * Created in collaboration with Basti Böhm
 *
 */

void setup() {
  Serial.begin(9600);
  pinMode(10, INPUT_PULLUP);
  pinMode(9, INPUT_PULLUP);
  delay(4000);
}

void loop() {
  if (digitalRead(10) == HIGH) {
    delay(10);
  } 
  else {
    Keyboard.set_modifier(0);
    Keyboard.set_key1(KEY_SPACE);
    Keyboard.send_now();
    releasekey();
    delay(500);
  }

  if (digitalRead(9) == HIGH) {
    delay(10);
  } 
  else {
    Keyboard.set_modifier(0);
    Keyboard.set_key1(KEY_ESC);
    Keyboard.send_now();
    releasekey();
    delay(500);
  }
  delay(10);
}

void releasekey() {
  Keyboard.set_modifier(0);  
  Keyboard.set_key1(0);
  Keyboard.send_now();
}