Sends a keystroke to a connected computer. This is similar to pressing and releasing a key on your keyboard. You can send some ASCII characters or the additional keyboard modifiers and special keys.
Only ASCII characters that are on the keyboard are supported. For example, ASCII 8 (backspace) would work, but ASCII 25 (Substitution) would not. When sending capital letters, Keyboard.write() sends a shift command plus the desired character, just as if typing on a keyboard. If sending a numeric type, it sends it as an ASCII character (ex. Keyboard.write(97) will send 'a').
For a complete list of ASCII characters, see ASCIITable.com.
WARNING: When you use the Keyboard.write() command, the Arduino takes over your keyboard! Make sure you have control before you use the command. A pushbutton to toggle the keyboard control state is effective.
character : a char or int to be sent to the computer. Can be sent in any notation that's acceptable for a char. For example, all of the below are acceptable and send the same value, 65 or ASCII A:
int : number of bytes sent
Corrections, suggestions, and new documentation should be posted to the Forum.
The text of the Arduino reference is licensed under a Creative Commons Attribution-ShareAlike 3.0 License. Code samples in the reference are released into the public domain.