Daten von RFID-Karten (versuchen zu) lesen.

include/controller.h

@@ -17,7 +17,8 @@ class Controller {
 	uint8_t button_pressed = 0;
 	unsigned long button_pressed_since = 0;
 	bool button_already_processed = false;
-
+	String read_rfid_data();
+	
 	public:
 	void handle();
 	void next_track();