Even if you don’t need a network-connected MP3 player or GPS information display, we bet browsing the source code would be useful.

A digital music player that supports the MP3 audio format. Starting in the 2000s, MP3 players caused a revolution in online music downloads and distribution (see MP3). All portable music players ...

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We think [Brek Martin] set out to build a handheld GPS and ended up adding an mp3 Player to it. Regardless, it’s beautifully constructed. Hand built circuit boards and even a custom antenna ...