HID/examples/KeyboardLed/KeyboardLed.ino

/*
  Copyright (c) 2014-2015 NicoHood
  See the readme for credit to other people.

  KeyboardLed example

  Press a button to toogle caps lock.
  Caps lock state is represented by the onboard led.
  Leds are only supported on single report HID devices.

  See HID Project documentation for more information.
  https://github.com/NicoHood/HID/wiki/Keyboard-API
*/

#include "HID-Project.h"

const int pinLed = LED_BUILTIN;
const int pinButton = 2;

void setup() {
  pinMode(pinLed, OUTPUT);
  pinMode(pinButton, INPUT_PULLUP);

  // Sends a clean report to the host. This is important on any Arduino type.
  BootKeyboard.begin();
}


void loop() {
  // Update Led equal to the caps lock state.
  // Keep in mind that on a 16u2 and Arduino Micro HIGH and LOW for TX/RX Leds are inverted.
  if (BootKeyboard.getLeds() & LED_CAPS_LOCK)
    digitalWrite(pinLed, HIGH);
  else
    digitalWrite(pinLed, LOW);

  // Trigger caps lock manually via button
  if (!digitalRead(pinButton)) {
    BootKeyboard.write(KEY_CAPS_LOCK);

    // Simple debounce
    delay(300);
  }
}