Media Control Buttons

This is a very (very) simple Arduino sketch to control playing media with physical buttons. It uses 3 pins on the Arduino (Leonardo in my case) to control media next, media previous, and media play/pause. It has been tested on Linux and Android, but it should work on anything that can use a usb HID. This sketch depends on HID-Project by NicoHood, which can be installed from the library manager in the IDE.

Download: Zipped .ino
media_control.zip MD5: 0e59c85f7c5114792aa8e33371f72107


// Media control buttons
// 09/13/2020 grim@shnisugah.com

#include "HID-Project.h"

const int buttons[] = {7, 8, 9};
const int debounce = 300;

int readkey() {
  int buttonstate;
  for (int i=0; i<3; i++) {
    buttonstate = digitalRead(buttons[i]);
    if (buttonstate == 0) {
      return buttons[i];
    }
  }
  return 0;
}

void keydec(int key) {
  if (key == buttons[0]) {
    // previous
    Consumer.write(MEDIA_PREVIOUS);
  } 
  if (key == buttons[1]) {
    // playpause
    Consumer.write(MEDIA_PLAY_PAUSE);
  } 
  if (key == buttons[2]) {
    // next
    Consumer.write(MEDIA_NEXT);
  }
}

void setup() {
  for (int i=0; i<3; i++) {
    pinMode(buttons[i], INPUT_PULLUP);
  }

  Consumer.begin();
}

void loop() {
  int kstat = readkey();
  if ( kstat > 0 ) {
    keydec(kstat);
    delay(debounce);
  }
}