Есть servonaut, есть usm. Может появилось ещё что-то, но это самые известные
А взять модуль плеера стоит копейки с UART и еще там какой то интерфейс (но собственно почти любой начинающий сможет его заюзать не сложнее датчика температуры), заливаешь файлы отправляешь имя файла и параметры воспроизведения.
Будьте внимательнее при выборе модуля.Там 3 вида прошивки и не все работают в mp3, там 3 вида прошивки модуля и не все работают в mp3. И запускать его можно без приблуд, тупо подавая питание.Так же, если поискать, есть хорошие мануалы на более доступном языке…
Владимир
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