DFPlayer MP3 Module Troubleshooting: SD Card and Code

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If the module refuses to play a file, try to reformat your SD card. (The LED on the module will fully light up if it is playing a file) If the LED does not turn on, try a different SD.

To clarify, the pin of the Arduino that connects to the RX pin of the DFPlayer is referred to as TX (transmitter) for the Arduino. The pin that connects to the TX pin of the DFPlayer is referred to as the RX (receiver).

Connecting 5v to the RX pin of the DFPlayer will cause the module to no longer work. Be very careful when soldering and use a 10k resistor when connecting the RX pin of the DFPlayer.

When coding, I recommend using the example code from the DFPlayer library you chose. Libraries differ in command names so it is best to use an example that the library author had created.
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