#include "HID-Project.h" const int pinLed = LED_BUILTIN; //Built-in LED for confidence monitoring const int pinBut1 = 9; //Mute const int pinBut2 = 10; //Play/Pause const int pinBut3 = 11; //Next Track void setup() {   pinMode(pinLed, OUTPUT);   pinMode(pinBut1, INPUT_PULLUP);   pinMode(pinBut2, INPUT_PULLUP);   pinMode(pinBut3, INPUT_PULLUP);    Consumer.begin(); } void loop() {   if (!digitalRead(pinBut1)) {     digitalWrite(pinLed, HIGH);     Consumer.write(MEDIA_VOLUME_MUTE);     delay(300);     digitalWrite(pinLed, LOW);   }   if (!digitalRead(pinBut2)) {     digitalWrite(pinLed, HIGH);     Consumer.write(MEDIA_PLAY_PAUSE);     delay(300);     digitalWrite(pinLed, LOW);   }   if (!digitalRead(pinBut3)) {     digitalWrite(pinLed, HIGH);     Consumer.write(MEDIA_NEXT);     delay(300);     digitalWrite(pinLed, LOW);   }   }