===== I/O-Gadget: MP3 Notification (serial) =====

IMPORTANT: There are some MP3-modules which look similar to the "DFPlayer Mini" like "WTV020-SD-16P SD" but have different pinout and different protocol. Mismatch can damage the module!

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==== Suggestions for notification sound files ====

  * https://notificationsounds.com/notification-sounds (free)
  * https://www.zedge.net/find/ringtones/notification (free)
  * https://freesound.org/search/?q=notification (free)
  * https://appraw.com/ringtones/notification-sound (free)
  * http://www.orangefreesounds.com (free)
  * https://www.soundsnap.com/tags/notification (pay)