DFPlayer not connected??- DFRobot Forum

2020-06-24 20:37:25 Hi. I have 3 of these mp3 players and found that none of them appeared to be working with the same problem as mentioned above. I found that the file names have to be named specifically 0001.mp3. Even if in Windows Explorer the file type is mp3, the file name still has to be 0001.mp3. The lack of a .mp3 extension is the problem. anonymous

2020-02-09 10:25:57 I purchased 3 of these DFPlayer mini's and none of them worked. All I could get was "Unable to begin: recheck connection, insert SD card." I wired and rewired, I switched players, I switched resistors, I switched arduinos, I tried nanos, unos and megas... Nothing. I could ground the ADKEYs and get it to play, but if there I have to buy more than three of them to get one that works, I'll just go to some other supplier and find something that works. Thanks for nothing!!! mark

2018-11-14 09:08:56 I too had the exact same situation as tweekstemp. I read his info and then tried to get sound by grounding the pins on the opposite side.
it plays the file when I ground it. yay! but it will not play via the Arduino program. did he mean he changed the dfplayer module, or did he change a serial command IN THE CODE. I am not an electrical engineer and get frustrated when things don't work after checking a hundred times. I previously bought a music maker shield which I paid $35 for and never got it to work. I had an experienced person come to help and still no good. I wanted to return it, but that sure is difficult to figure out. Now I am wondering if my DFPlayer is also faulty. the wiring diagram is so simple, and I checked it again and again. What do I do? rad99

2017-09-27 19:30:36 For those following along.. the problem was not in my software. The DFPlayer I had had bad serial lines. I just swapped mine out with a new one (same code) and it worked fine.

Also.. just a tip. don't use the serial lines while it's playing or you'll interrupt the DFPLayer's tiny little CPU and cause crackle distortion in the audio. Instead, just passively monitor pine 16, the _BUSY line to tell when the audio file is playing (active low) and when it's stopped (HIGH).

Cheers,

Tweeks tweekstemp

2017-09-24 20:36:19 More info..
After the "Unable to begin" error.. I added some troubleshooting code to get the status readState and readFileCounts like this:
if (!myDFPlayer.begin(mySoftwareSerial)) { //Use softwareSerial to communicate with mp3.
Serial.println(F("Unable to begin:"));
Serial.println(F("1.Please recheck the connection!"));
Serial.println(F("2.Please insert the SD card!"));
Serial.println(myDFPlayer.readState()); //read mp3 state
Serial.println(myDFPlayer.readFileCounts()); //read all file counts in SD card
while(true);
}

and got -1 for but results:
DFRobot DFPlayer Mini Demo
Initializing DFPlayer ... (May take 3~5 seconds)
Unable to begin:
1.Please recheck the connection!
2.Please insert the SD card!
-1
-1

What does this indicate?

I'm following the latest PDF:
file:///home/tweeks/Downloads/DFPlayer%20Mini%20Manual.pdf

Tweeks tweekstemp

2017-09-24 20:14:59 I'm seeing the same problem (using pins 10 & 11).. exactly as your schematic shows (with one 1k res on the arduino TX line (11)) and with one on both the TX and RX lines. at 115k2 baud and at 9600. It just acts like it doens't see it.

I can play all my MP3 files just fine using wires to GND on the trigger and AD ports.. and the sound files sound great. I even tried swapping the TX RX lines (in case there some some confusion in the documentation. Still can't "see" the DFPLay module. (and I'm an electrical engineer)

Just can't see the DFPlay module from the arduino (or talk to it).

Other people seeing this? Any suggestions? Do the DFPlay moduels "blow" easily? Are they 5v/3.3v sensitive?

Tweeks tweekstemp

2017-05-17 23:03:55 It looks like the wiring problem, did you check the wiring? robert.chen

2017-05-17 04:59:13 I purchased DFPlayer mini and followed your set up (https://www.dfrobot.com/wiki/index.php/DFPlayer_Mini_SKU:DFR0299) and installed your sketch to my Arduino Mega but I keep getting the serial messages:

DFRobot DFPlayer Mini Demo
Initializing DFPlayer ... (May take 3~5 seconds
Unable to begin:
1.Please recheck the connection!
2.Please insert the SD card!

My SD Card is a micro SD Sandisk 1GB, FAT32 formatted with 1 folder "mp3" and 4 MP3 files all with the preceding 0001 - 0004 as directed.
Is there a way of testing further whether the DFPlayer or SD Card are at fault? I am totally new to this coding

Any help will be greatly appreciated, thanks. tk24271