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Picture of Portable MP3 AUX Music Box
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This process analysis showcases how to build a MP3 player with Arduino Nano, the files are 16-bit MP3 and do work unlike tradition Arduino music players which are limited to an 8-bit WAV.

Another portion of this tutorial demonstrates creating laser-cut cases using various websites and applications.

The box has a total of 21 songs along with a stop button as well.

Step 1: In Action!

Have your audio on, this shows just the intro to a few songs, and how the dial changes the buttons to new songs.