3PCS Mini MP3 Player Audio Module with 5PCS Metal Shell Round Internal Magnet Speaker 2W 8Ohm MP3 Voice Decode Board TF Card U Disk IO/Serial Port/AD Board DFPlayer Audio Music Module for Arduino

They work well. It would be nice if they would put the pin out on the board

Putting sound to a fuzzy toy for my granddaughter. No arduino needed for sound. I threw a few Mp3 files onto an sd card and labeled 0001-0005. Power supplied by single Lipo 18650 4.2v battery salvaged from old laptop. Wired four switches in series #1 direct (resistors needed) #2 1k ohm #3 6.2k ohm #4 9.1k ohm and works great. Her toy growls, giggles, hums and farts. Next project is record company radio chatter and place one behind a dispatch desk to drive people nuts. Cheapest part of whole project was the card. Schematics are online or lookup HackMakeMod on YouTube for a short tutorial.

I paired this with a NodeMCU board to control playback and I found that two of the three modules were very unstable and had to be reset two or three times before they would work. Even with a decent official Raspberry Pi PSU and decoupling caps between VCC and GND, I just couldn't get them to start reliably. I eventually got the third module to work reliably, although once every so often it fails to play and I need to reset the module. Nevertheless, a stock standard DFPlayer board and speakers. Once I got it to work, the official DFPlayer docs explained everything perfectly. The speakers produce a surprisingly good quality sound considering their size and price. The video attached shows the speaker at 50% volume. It's worth mentioning that unfortunately the hardware does not allow the MCU to upload or modify the content of the SD card on the player.

I bought it because I would get three for the price of one original DFRobot mp3 player. But this doesn't work with Arduino, I tried everything that I could think of. It works standalone so the circuit is working but I think issue is with the firmware. So, if you are planning to use it with Arduino buy the original one. I learned the lesson after soldering :(. Turns out there was some shorting on my board with the serial terminals. This player was probably ok. So changing to 5 stars.

These are amazing little modules, especially if you plan to use them as stand alone players using a push button interface. To use serial communication however, there is a serious bug related to the checksum calculation. There are several important commands that will return an error if you send the command string as specified by the documentation. For example, the Play Track, Loop Track, Set Volume, Set Equalizer Mode are just some of the functions that will not work as described, and unfortunately I was unable to find a solution by researching every forum I could find. Hours wasted! Thankfully I was able to discover three fixes myself using just a terminal program sending modified command strings. First, if you eliminate the two checksum bytes all commands will work ("7E FF 06 03 00 00 01 FE F7 EF" becomes "7E FF 06 03 00 00 01 EF") Secondly, (and do only if the command is failing) if you set the Need Feedback byte to "01" without changing the checksum bytes ,most commands will work ("7E FF 06 03 00 00 01 FE F7 EF" becomes ("7E FF 06 03 01 00 01 FE F7 EF"). and thirdly, if you increase the LSB checksum byte by 1, without turning on Need feedback, most commands will work (("7E FF 06 03 00 00 01 FE F7 EF" becomes ("7E FF 06 03 00 00 01 FE F8 EF"). Many people have struggled with this problem so I hope you find this info helpful. It will likely take some work to incorporate these changes into you code. Good luck...