5 Pcs Mini MP3 Module Compatible with DFPlayer Code for Arduino Raspberry Pi ESP32 STM

I was having problems getting these to play anything. I searched youtube and other online resources and it looked like it should have worked without any difficulty, but I couldn't figure it out. I tried putting the files in the MP3 folder, naming the mp3's 0001.mp3 etc... Tried wired to an arduino. tried wired standalone with push buttons... Nothing worked. I was about to give up... I couldn't get it to play more than ~100ms of audio if that. Turns out I was trying to run it at 3.3V but it actually needs a 5V supply. i'm just an occasional electronics hobbyist and got confused by this line: "Because the operating voltage of the DFPlayer Mini module is 3.3V, and the input voltage of the main control board is 5V, a 1K resistor is needed for voltage division". Once I adjusted my benchtop power supply to 5V it played perfectly. I saw the reviews saying these cheaper ones don't work, and I almost agreed, until i bought the DFRobot one and experienced the same problem... These seem like they will be just fine for any other audio projects in my future.

Easy to use since it fits perfectly on a standard breadboard. The store page even has the pins listed and well documented on how to wire. Worked well and connected in my project using an esp32, and it was relatively cheap for how many you get ($2.50~ a chip). Needs a MicroSD card, and I was able to get the audio to play by putting the .mp3 (0001.mp3) in its own folder on the microSD (/mp3/0001.mp3)

Amazon says the initial review doesn't meet community guidelines because external links, see rtek1000/MP3-TF-16P_V3.0 Github for more info. This is a lower quality spinoff of the original component made by DFRobot. 1. Avoid this model. Prefer other models such as the original DFPlayer Mini, MP3-TF-16P (other than V3.0), or try other models (maybe the XY5300 board). 2: The module may crash when data is being sent and the microcontroller is reset or reprogrammed. The module may crash if the data sent is not exactly what it should be. 3: The RESET command does not work if the module is locked (see tip 2). 4: To unlock the module, reset the power (It may be necessary to use a transistor in the power supply). When the power is turned off, a whistle may occur at the audio output (A 3300uF 6.3V capacitor in the supply may help reduce the whistle). 5: An interval of around 200ms is required between commands (is slower than other models). 6: Interval required after RESET command (or power initialization) (maybe 250ms) (LED lights up dimly). 7: If the data pins (Busy etc) receive more than 3.3V, it can be passed on to the SD card power supply (It may damage the SD card). 8: Command 0x12 (MP3 folder) may not work, try command 0x03 (root directory). The folder must have capital letters (MP3). 9: Powering with 5V may cause damage to the SD card and damage to the USBdisk (It no longer recognizes the memories on the computer).

I spent 2 days trying to get these to work with an ESP32 and a RP Pico. I even had ChatGPT trying to help me, but constant errors for "SD init Failure" or "SoftwareSerial.h has no matching file or directory". The same errors with all 5 boards. Even ChatGPT said to return them. I almost did, but decided to do one last internet search for solutions. 1) The LED on the DFPlayer ONLY lights up when a file is playing. Many reviews say they can't even get 1 board to power on (I thought the same), but the LED does not show the status of the module being on or off, only whether a file is playing or not. 2) If you're using Windows to format the SD card, it can cause errors based on the way Windows handles formatting (my "SD init Failure" error). Instead, go to sdcard.org/downloads/formatter and download SD Memory Card Formatter 5.0.3 (current version). This formatter complies with the SD File System Specification created by the SD Association. 3) I was trying to use different sketch examples from videos and websites I found online, but they were a few years old. They used the "SoftwareSerial.h" library, but that is no longer needed because the "HardwareSerial.h" library is now included in Arduino IDE. This is the one you have to include with the "DFRobotDFPlayerMini.h" library. 4) I finally found a working example sketch at arduinoyard.com/dfplayer-mini-with-esp32/ I do get a pop from the speaker when the module first powers on to play a file, as a few others have said, but other than that, they work as well as I had hoped.

Used with Arduino and works great.

Generally works as advertised. While included documentation is severely lacking, there is tons of information online. There are also Arduino and ESP32 libraries available. The only issue is the sound quality. When using the built in amp, there is terrible popping on power up. When using the digital audio output to an external amp, you can get around this popping by muting the amp during power on. This fixes the popping. Both outputs, however, have a repeating clicking noise playing under the audio track. Nothing I have tried seems to fix this (stopping volume updates, decoupling, star grounding), and I believe that is is a quality issue with the product. While this is annoying, for the price this product is still a good deal.

Great components easy to use

The busy pin works with code to limit extra motion triggers while the current song or sound is playing. This eliminates false triggers which would lead to more than one sound or song file being played on a motion trigger. So this saves on battery life and limits extra sounds being played when you don’t want them to. The DF player fits in a pc board and solders up nicely. The sound is loud on a .5watt speaker. No extra amp needed if you go up to like a 3 amp speaker then you will need an amp to drive the speaker. Otherwise it’s a direct connection from the player to a .5watt speaker