## 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.