Teensey as usb keyboard

Hello there,

recently I bought a new Teensey 3.6. I need it to work like a usb keyboard for my project. Therefore I tried to follow the steps on this website: https://www.pjrc.com/teensy/usb_keyboard.html , but the function usb_keyboard_press(key, modifier) doesn't work for me.

Here is the code I tried to write:

#include <print.h>
#include <usb_keyboard.h>

//int keyboard_keys[6];

const int buttonPin = 1;
const int buttonPin2 = 2;
const int buttonPin3 = 3;
const int buttonPin4 = 4;
const int buttonPin5 = 5;
const int buttonPin6 = 6;

boolean wasON = false;
int buttonState = 0;
int buttonState2 = 0;
int buttonState3 = 0;
int buttonState4 = 0;
int buttonState5 = 0;
int buttonState6 = 0;

void setup() {

pinMode(buttonPin, INPUT_PULLUP);
pinMode(buttonPin2, INPUT_PULLUP);
pinMode(buttonPin3, INPUT_PULLUP);
pinMode(buttonPin4, INPUT_PULLUP);
pinMode(buttonPin5, INPUT_PULLUP);
pinMode(buttonPin6, INPUT_PULLUP);

/* keyboard_keys[0] = 0;
keyboard_keys[1] = 0;
keyboard_keys[2] = 0;
keyboard_keys[3] = 0;
keyboard_keys[4] = 0;
keyboard_keys[5] = 0;
*/

}

void loop() {

buttonState = digitalRead(buttonPin);
buttonState2 = digitalRead(buttonPin2);
buttonState3 = digitalRead(buttonPin3);
buttonState4 = digitalRead(buttonPin4);
buttonState5 = digitalRead(buttonPin5);
buttonState6 = digitalRead(buttonPin6);

if (buttonState == LOW) {
usb_keyboard_press(KEY_A, KEY_SHIFT);
}
}

Thanks for your help!

That's for the oldest Teensy boards only.

For Teensy 3.6, use Arduino with Teensyduino. After running the installer, select Teensy 3.6 in Arduino's Tools > Boards menu. Then click File > Examples > Teensy > USB_Keyboard > Buttons to get started.

Before uploading, you also need to select Keyboard from Tools > USB Type, but you'll find that mentioned in the example's comments, and if you leave the default to Serial the error message should tell you about this too.