DFPlayer mini, the speaker will murmur, seems like noise- DFRobot Forum

2016-03-25 23:46:49 Hi,

Good to hear that, I attached your answer to wiki>FAQ, Q1, hope you don't mind.

I didn't get you about "how to use one power supply", do you mean once you connct MP3 group to Arduino, murmur will come back? But the power adapter-arduino- mp3, they should be in the same ground, or serial signal won't work.

For the BUSY pin, if I didn't understand wrong, it can't be controlled. It represents the player's playing state, play/pause will set the pin HIGH/LOW. Leff

2016-03-24 23:41:02 Hey, my English is not my mother tongue either, yours is very good!

I tried it on Uno/leonardo without any problem, and only added one 1K to Rx.

But I remeber there was a time that I would here the murmue when the module is out of control, but once I upload an available code to play some music and stop it, no noise would be heared anymore.

Sorry I don't know what to suggest so far... If I got some idea, I will tell you. Leff

2016-03-24 02:43:52 Hello Leff,

Operating voltage is 4.6 - 5V
I use 1K resistance at TX and RX pins, but I listen "murmur" at low volume or where volume is "0".

I tried to use different arduino modules (nano, mega, uno, original\chines) and different DFPlayer mini modules with next code:

Code: Select all

#include <DFPlayer_Mini_Mp3.h>

#define MP3_RX 8
#define MP3_TX 9

SoftwareSerial mp3_serial = SoftwareSerial(MP3_TX, MP3_RX); // RX, TX mp3 

void setup() {
  mp3_serial.begin(9600);
  mp3_set_serial(mp3_serial);
  delay(100);
  mp3_set_volume(10);
  delay(100);
  mp3_play(800); // or mp3_next();
  delay(100);
}

void loop() {
 
}

, but result is same.

P.s. Sorry for my bad english. bam

2016-03-24 02:43:52 Hello Leff,

Operating voltage is 4.6 - 5V
I use 1K resistance at TX and RX pins, but I listen "murmur" at low volume or where volume is "0".

I tried to use different arduino modules (nano, mega, uno, original\chines) and different DFPlayer mini modules with next code:

Code: Select all

#include <DFPlayer_Mini_Mp3.h>

#define MP3_RX 8
#define MP3_TX 9

SoftwareSerial mp3_serial = SoftwareSerial(MP3_TX, MP3_RX); // RX, TX mp3 

void setup() {
  mp3_serial.begin(9600);
  mp3_set_serial(mp3_serial);
  delay(100);
  mp3_set_volume(10);
  delay(100);
  mp3_play(800); // or mp3_next();
  delay(100);
}

void loop() {
 
}

, but result is same.

P.s. Sorry for my bad english. bam

2016-03-24 02:15:36 Hi bam,

What's your controller? If this cards operation voltage is
* 3.3V, no risister needed
* 5V, 1K risistance is ok

If it is not the problem related with the risistance, then how is it when you upload another MP3 player sample code? Leff

2016-02-16 20:32:37 O, really? Can you show me a picture of your wiring?

And your code? Leff

2016-02-07 17:12:29 Hello, I connect 1k resistors between the arduino module and MP3 rx/tx, but noise (murmur) is going on.
I cheked 4 differnt dfplayer mini and have the same problem. Any ideas about solve this problem?

Q 1. When Arduino send command to DFPlayer mini, the speaker will murmur, seems like noise, how to deal with it?
A: Plz connect a 1k resistor between the module and MP3 on TX-RX and RX-TX.Because DFPlayer Mini Module operating voltage is 3.3V.

bam