MP3-player YX5300
Control your YX5300 MP3 player with the SerialMP3Player library. And: how to (voice-) control the MP3 player with the smartphone. Also: SD card problems?
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Controlling Arduino boards with your smartphone
Arduino boards (or other MCUs) can be controlled via Bluetooth with your smartphone. There are pre-built apps for this or you can develop them yourself with MIT App Inventor.
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