## Keyboard Serial This example listens for a byte coming from the serial port. When received, the board sends a keystroke back to the computer. The sent keystroke is one higher than what is received, so if you send an "a" from the serial monitor, you'll receive a "b" from the board connected to the computer. A "1" will return a "2" and so on. NB: When you use the Keyboard.print() command, the Leonardo, Micro or Due board takes over your computer's keyboard! To insure you don't lose control of your computer while running a sketch with this function, make sure to set up a reliable control system before you call Keyboard.print(). This sketch is designed to only send a Keyboard command after the board has received a byte over the serial port. ### Hardware Required * Arduino Leonardo, Micro, or Due board ### Circuit Connect your board to your computer with a micro-USB cable. Once programmed, open your serial monitor and send a byte. The board will reply with a keystroke that is one number higher. [](https://www.arduino.cc/en/uploads/Tutorial/KeyboardSerial_bb.png) image developed using [Fritzing](http://www.fritzing.org/). For more circuit examples, see the [Fritzing project page](http://fritzing.org/projects/) ### Code /*   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);   } } [[Get Code]](https://www.arduino.cc/en/Tutorial/KeyboardSerial?action=sourceblock&num=1) ### See Also * [Keyboard.write](https://www.arduino.cc/en/Reference/KeyboardWrite)() * [Keyboard.print](https://www.arduino.cc/en/Reference/KeyboardPrint)() * [Keyboard.println](https://www.arduino.cc/en/Reference/KeyboardPrintln)() * [ASCIITable](https://www.arduino.cc/en/Tutorial/ASCIITable) - Demonstrates Arduino's advanced serial output functions. * [KeyboardLogout](https://www.arduino.cc/en/Tutorial/KeyboardLogout) - Logs out the current user with key commands. * [KeyboardMessage](https://www.arduino.cc/en/Tutorial/KeyboardMessage) - Sends a text string when a button is pressed. * [KeyboardReprogram](https://www.arduino.cc/en/Tutorial/KeyboardReprogram) - Opens a new window in the Arduino IDE and reprograms the Leonardo with a simple blink program. * [KeyboardAndMouseControl](https://www.arduino.cc/en/Tutorial/KeyboardAndMouseControl) - Demonstrates the Mouse and Keyboard commands in one program. * [ButtonMouseControl](https://www.arduino.cc/en/Tutorial/ButtonMouseControl) - Control cursor movement with 5 pushbuttons. * [JoystickMouseControl](https://www.arduino.cc/en/Tutorial/JoystickMouseControl) - Controls a computer's cursor movement with a Joystick when a button is pressed.