Playing and controlling MP3s works great. \o/

include/controller.h

@@ -1,17 +1,18 @@
 #pragma once
 
+#include <Arduino.h>
+#include "config.h"
 #include "player.h"
-#include "sd_card.h"
+#include <MFRC522.h>
 
 class Controller {
 private:
+	MFRC522* _rfid;
+	bool _rfid_enabled = true;
+	void _check_rfid();
+	void _check_serial();
 	Player* _player;
-	SDCard* _sd_card;
-
 public:
-	Controller(Player* p, SDCard* c) : _player(p), _sd_card(c) {}
-	void vol_up();
-	void vol_down();
-	void track_next();
-	void track_prev();
+	Controller(Player* p);
+	void loop();
 };