Spent an entire day researching and attempting to fix the DFPlayer noise problem. The amp works as expected, so it is not the problem. I have made a video to help you better understand the sound produced: https://www.youtube.com/watch?v=uK2kkR0XjFs&feature=youtu.be
This is the amp/speaker used: https://sites.google.com/site/wayneholder/chiptunes
The amp with speaker works as expected using another similar mp3 player like from a computer or possibly a phone.
Here we get the bep bep bep bep bep... as the amp/speaker has its own battery power.
Here I made everything as one power source. Bep bep bep bep bep...
I think I exhausted my research and made the following attempts:
> -Electrolytic Capacitor at the power terminals
> -Electrolytic Capacitor parallel with ceramic capacitor from negative terminal to VCC in DFPlayer
> -Diode from positive terminal to VCC in DFPlayer
> -Battery Power source; USB power source; Power Supply power source; 5V USB plug regulator power source
> -1k Resistor from TX RX; Rx Tx
> -1-10k resistor from Rx Tx
> -1k between channel to GND
> -Separate power source for each the Arduino, amp, and DFPlayer
> -Tried multiple DFPlayers
Keep note that the amp/speaker works well. The files are the same both on the computer and in the SD card.
Here is my code:
#include <DFRobotDFPlayerMini.h>
/***************************************************
DFPlayer - A Mini MP3 Player For Arduino
<https://www.dfrobot.com/index.php?route=product/product&product_id=1121>
***************************************************
This example shows the basic function of library for DFPlayer.
Created 2016-12-07
By [Angelo qiao](Angelo.qiao@dfrobot.com)
GNU Lesser General Public License.
See <http://www.gnu.org/licenses/> for details.
All above must be included in any redistribution
****************************************************/
/***********Notice and Trouble shooting***************
1.Connection and Diagram can be found here
<https://www.dfrobot.com/wiki/index.php/DFPlayer_Mini_SKU:DFR0299#Connection_Diagram>
2.This code is tested on Arduino Uno, Leonardo, Mega boards.
****************************************************/
#include <Arduino.h>
#include <SoftwareSerial.h>
#include <DFRobotDFPlayerMini.h>
int counter = 0;
SoftwareSerial mySoftwareSerial(10, 11); // RX, TX
DFRobotDFPlayerMini myDFPlayer;
void printDetail(uint8_t type, int value);
void setup()
{
mySoftwareSerial.begin(9600);
Serial.begin(115200);
Serial.println();
Serial.println(F("DFRobot DFPlayer Mini Demo"));
Serial.println(F("Initializing DFPlayer ... (May take 3~5 seconds)"));
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!"));
while(true);
}
Serial.println(F("DFPlayer Mini online."));
myDFPlayer.volume(15); //Set volume value. From 0 to 30
delay(1000);
myDFPlayer.enableDAC(); //Enable On-chip DAC
}
void loop()
{
static unsigned long timer = millis();
if(millis() - timer > 1000 && counter == 0)
{
myDFPlayer.play(1);
Serial.println(F("Music Started"));
delay(1000);
Serial.println(F("1 second later..."));
delay(6000);
Serial.println(F("7 seconds later..."));
delay(1000);
counter =1;
}
delay(7000);
if (myDFPlayer.available()) {
printDetail(myDFPlayer.readType(), myDFPlayer.read()); //Print the detail message from DFPlayer to handle different errors and states.
}
}
void printDetail(uint8_t type, int value){
switch (type) {
case TimeOut:
Serial.println(F("Time Out!"));
break;
case WrongStack:
Serial.println(F("Stack Wrong!"));
break;
case DFPlayerCardInserted:
Serial.println(F("Card Inserted!"));
break;
case DFPlayerCardRemoved:
Serial.println(F("Card Removed!"));
break;
case DFPlayerCardOnline:
Serial.println(F("Card Online!"));
break;
case DFPlayerPlayFinished:
Serial.print(F("Number:"));
Serial.print(value);
Serial.println(F(" Play Finished!"));
break;
case DFPlayerError:
Serial.print(F("DFPlayerError:"));
switch (value) {
case Busy:
Serial.println(F("Card not found"));
break;
case Sleeping:
Serial.println(F("Sleeping"));
break;
case SerialWrongStack:
Serial.println(F("Get Wrong Stack"));
break;
case CheckSumNotMatch:
Serial.println(F("Check Sum Not Match"));
break;
case FileIndexOut:
Serial.println(F("File Index Out of Bound"));
break;
case FileMismatch:
Serial.println(F("Cannot Find File"));
break;
case Advertise:
Serial.println(F("In Advertise"));
break;
default:
break;
}
break;
default:
break;
}
}
