I have a Teensy set up as a keyboard, joystick, and I'm giving keyboard commands. Letter and number keys are going fine. But when I try sending ENTER, I get some extra code in my Linux terminal:

$ 16424
16424: command not found

the code I have to give the ENTER key goes like this:

void setup() {
  pinMode(0, INPUT_PULLUP);
  pinMode(1, INPUT_PULLUP);

void loop() {
  // read the digital inputs and set the buttons
  Joystick.button(1, digitalRead(0));

where is this "16424" coming from, and how do I send an ENTER keypress? I am using a Teensy 2.0, on Linux, with Arduino IDE 1.6.7.

  • Keyboard.println((char) KEY_ENTER); might be the problem? Commented Apr 15, 2016 at 7:11

1 Answer 1


You can't just "print" a key like that. You use print for sending text.

When you use println it sends an enter key along with your text, so you can do :

Keyboard.println("ls -al");

and it will send the text ls -al and press enter for you.

If you want to do it in the 'raw' way you will need to press and then release the key:


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