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/* Arduino USB Keyboard HID demo
* Volume+/Volume-/Mute keys
*/
uint8_t buf[8] = {
0 }; /* Keyboard report buffer */
#define PIN_VOLUME_UP 5
#define PIN_VOLUME_DOWN 6
#define PIN_MUTE 7
int state = 1;
void setup()
{
Serial.begin(9600);
pinMode(PIN_VOLUME_UP, INPUT);
pinMode(PIN_VOLUME_DOWN, INPUT);
pinMode(PIN_MUTE, INPUT);
// enable internal pull-ups
digitalWrite(PIN_VOLUME_UP, 1);
digitalWrite(PIN_VOLUME_DOWN, 1);
digitalWrite(PIN_MUTE, 1);
delay(200);
}
void loop()
{
state = digitalRead(PIN_VOLUME_UP);
if (state != 1) {
buf[2] = 128; // Volume up key
Serial.write(buf, 8); // Send keypress
releaseKey();
}
state = digitalRead(PIN_VOLUME_DOWN);
if (state != 1) {
buf[2] = 129; // Volume down key
Serial.write(buf, 8); // Send keypress
releaseKey();
}
state = digitalRead(PIN_MUTE);
if (state != 1) {
buf[2] = 127; // Mute key
Serial.write(buf, 8); // Send keypress
releaseKey();
}
}
void releaseKey()
{
buf[0] = 0;
buf[2] = 0;
Serial.write(buf, 8); // Release key
}
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