Arduino/build/shared/examples/09.USB/Keyboard/KeyboardSerial/KeyboardSerial.ino

/*
  Keyboard test

  For the Arduino Leonardo, Micro or Due

  Reads a byte from the serial port, sends a keystroke back.
  The sent keystroke is one higher than what's received, e.g.
  if you send a, you get b, send A you get B, and so forth.

  The circuit:
  - none

  created 21 Oct 2011
  modified 27 Mar 2012
  by Tom Igoe

  This example code is in the public domain.

  http://www.arduino.cc/en/Tutorial/KeyboardSerial
*/

#include "Keyboard.h"

void setup() {
  // open the serial port:
  Serial.begin(9600);
  // initialize control over the keyboard:
  Keyboard.begin();
}

void loop() {
  // check for incoming serial data:
  if (Serial.available() > 0) {
    // read incoming serial data:
    char inChar = Serial.read();
    // Type the next ASCII value from what you received:
    Keyboard.write(inChar + 1);
  }
}