DFPlayer Mini - Grinding Audio
MaxxPowers 2025-07-31 07:41:51 974 Views4 Replies I need help before I pull out what little hair I have left. I cannot get normal audio playback from my DFMini player. Using the sample code and the wiring schematic from https://wiki.dfrobot.com/dfplayer_mini_sku_dfr0299 (also ensuring the SD card is Fat32, has an "mp3" folder with 3 tracks “0001.mp3, 0002.mp3, 0003.mp3) I get ”Time Out!" in the serial monitor.
When I test the code with a speaker I get a grinding sound that plays for 3 seconds, then pauses, then starts again. It is attempting to change tracks but produces a loud, digital grinding sound. If I pull the RX and TX pins I can hear the audio playing cleanly (quietly) and it stops chaning tracks, which is expected.
I have two DFMiniplayers and they exhibit the exact same issue, Ive also tried this with an Arduino Mega and Arduino Uno with the same result.
Can anyone help me? I tried using AI to help diagnose the issue and… it kept going in circles.
Sounds like the DFPlayer Mini is throwing a digital tantrum—classic RX/TX noise interference. Your wiring or grounding is almost certainly the culprit. Many readers in the soundboard scene hit this same snag.
SoundBoardW.Com Solved it!
.mp3 is case sensitive. The files need to be .MP3
MaxxPowers I'm having the exact same issue. When I remove the Tx/Rx it plays perfectly.
How did you change the extension from lower to upper case? I tried in File Explorer and it automatically changes it back to lower case.
I fixed it with a 1k resistor between the DFPlayer Rx and the Arduino Tx (in my case, pin 11)
