arduino keyboard emulator


All I had mentioned earlier we’re going to look at the arduino leonardo and some of its USB emulation capabilities. Now remember this is different than you know. The processor is different. This is the 32: u 4, which means it has built in USB capabilities and the lovely people that arduino have been nice enough to build into their processing language. Some libraries, which let us emulate certain devices today we’re gon na, be looking at keyboard, emulation, seeing what that can do now. It is a good idea to use a jumper in this I’m gon na be using pin 2, and let me explain why what we’re doing is we’re creating a switch here that allows us to turn on and off the USB mu emulation, because when you plug this In and it starts acting like a keyboard, the computer is only going to recognize it as a keyboard. So if you’re going to try and reprogram it as it’s acting as a keyboard, the IDE might have a little trouble and you might end up with just four useless boards. So by adding this jumper and we will set the pull up on the so it’s connected to ground, pin 2 so by using the jumper we’re helping prevent against this just becoming a useless board. So with that let’s go ahead and look at the code, so I’ve gone ahead and written in the two basic functions you need to start the code set up and loop now remember: we’ve got to put in pull up on, pin 2 in order to stop it And started acting like a keyboard, so it’s pin mode to input and to set the pull up.

Resistor we’re going to write, pin too high and remember that sets it to a logic, high level, so we’re going to have to check when it changes to logic. Low logic, high logic, low, okay to start keyboard, emulation again, it’s very key board is very similar to serial commands. So to start it you’re just going to start with keyboard dot begin, and that starts keyboard emulation. So we’re going to wait for, pin two to go low and then we’re gon na start giving it keyboard commands. Now I set it similar to the serial commands in that there’s keyboard print key. A keyboard spell keyboard print, Ln and keyboard keyboard that right now, keyboard, dot print, will print a character or a string of characters. Println will print a character, a string of characters followed by the return key and then right will write a specific ASCII character. So those are basic commands. There are more keyboard commands in the sense that you can say keyboard, press and then put in a specific key, say V and key, and that will press the N key in order to get to release that key. All you have to do say, release and key and that’s it or, if you’re, pressing, multiple use, you can just say, release all now with the press command with the press command, you can. There are special key codes that are built in to the keyboard library that are available on the arduino reference page.

I can link to that in the description such as key dot backspace, i think there’s key, a key underscore shift key underscore control that sort of thing. So, with all that in mind, let’s write a little bit of a demo program, so let’s start with keyboard. Dot print LM hello world put in a little bit of a delay of, say a thousand milliseconds that’s one second keyboard println, I am Alive, got no idea. What I’m writing here? I will Det lay another thousand, milliseconds and we’ll say: keyboard dot, right, 48, that’s, character, 0 and then we’ll just delay for a little bit of time, more time and then we’ll say keyboard, dot, press, the backspace key and we’ll. Let it backspace for a while remember that if you hold the backspace key it’ll back up a few times and it’s anything and we’ll, let that run for say 500 milliseconds. I have no idea what that’ll do and then I’ll just say: keyboard dot, release all and that’s, really it so again. It’S going to print hello world it’s, going to put in a new line it’s going to print. I am live print, a new line, then it’s going to put in character 0 that’s 0. The number then it’s going to wait and then it’s going to hit the backspace key for 500 milliseconds that’s, one half of a second and so that’s, really it so I’m. Going to go ahead and plug in my Leonardo and upload the code 1, okay, so it’s gone ahead and uploaded I’m going to open up.

You can open up any code. Any word editing program I’m, just going to open up notepad because it loads quicker than word and I’ve got. Remember: I’ve got the wire connected from ground to pin 2. So if I go ahead and do that, it prints in our text and then up there because it starts hitting the backspace key and 500 milliseconds was just enough to backspace over the 0 character, so that’s, really it for Leonardo keyboard device, emulation and that’s. The first video I’m going to do on the Leonardo’s USB emulation capabilities – I’m – probably gon na – do others on mouse and joystick and maybe combinations of those too, which will really focus more on reading sensor input and then making changes based upon that which is going to Capitalize on this waiting for you to start and stop that and you’ll see why it’s important.


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  1. A week ago I followed your example. Thanks for teaching. Today my windows 7 PC does not see the Leonardo. It just shows COM 1 (generic). I plugged in a Uno and it shows up as COM4. Any thoughts?

    1. as far as i know uno uses serial to connect to the computer etc. it doesn’t connect direcly to the pc

  2. I have a german keyboard so when tell the arduino leonardo to write a hyphen it puts something else how can i change the keyboard layout in the arduino ide?

  3. Will it works with Arduino Mega ? Because its gives me this compilation error “exit status 1
    ‘Teclado’ no encontrado. Tu sketch incluye la linea ‘#include ‘?”

  4. i did every thing u said it give this msg (exit status 1
    ‘Keyboard’ not found. Does your sketch include the line ‘#include
    ‘?) what should i do and im working with arduino
    leaonardo !

  5. GREAT walkthrough for beginners on Keyboard/Mouse emulation! Thank you for the video!
    NOTE: You must have a leonardo board (or other ATmega32u4 processor board) selected in ArduinoIDE to be able to compile this.

    How did you get it to compile without “#include “Keyboard.h””??

  6. So let me get this straight when you shorted it out did you short ground or the digital pin? Trying to understand a key press would activate the key input on the digital input.

  7. void setup()



    Keyboard.println(“HELLO WORLD”);
    Keyboard.println(“I AM ALIVE”);
    Keyboard.write(48); //character 0

    void loop()

  8. So many thanks for everything. I was trying to automatize some RPG games and I had an Leonardo, and it seems soooo easy now to automatie everything…. Thanks!

  9. Hello , good video ! thanks for you time.
    How print or write “arroba” (or “at” in english )?? I need write a email
    I have tried different ways but I can not get it.
    can you help me ?

    1. I resolve the problem to print “at”; // send Hex value for RETURN key; // send Hex value for RETURN key

  10. how to emulate keypress F1? and key combination like ctrl + alt? and with a potentiometer emulate key left right changing?


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