DFPlayer Mini MP3模块蓝灯不亮问题排查与解决

DFPlayer板后面工作的蓝灯没有亮问题出在哪以及如何解决

2022-04-049712

TANGQI

UID: 26951

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本文讨论了DFPlayer Mini MP3模块在使用过程中遇到的蓝灯不亮问题。用户已经检查了线路和代码，但仍然没有声音。文章详细解析了可能的原因，包括电源连接、模块初始化命令和通信波特率。提供了具体的故障排查步骤，帮助用户快速解决问题。长尾词：DFPlayer Mini, MP3模块, 蓝灯不亮, 故障排查, 代码检查, 线路检查, 声音问题, 解决方案, DFRobot, Arduino, 按键控制, 音频输出。

我用DFPlayer mini mp3模块，利用三个按键做下一首上一首和暂停/播放的效果,线路检查了好几遍，代码也正常，喇叭焊接也是成功的，但是按下按键没有声音，我发现DFPlayer板后面工作的蓝灯没有亮问题出在哪呢，以及怎么解决呀，求求大家帮帮忙，另外附上代码
#include "SoftwareSerial.h"
SoftwareSerial mySerial(10, 11);
# define Start_Byte 0x7E
# define Version_Byte 0xFF
# define Command_Length 0x06
# define End_Byte 0xEF
# define Acknowledge 0x00 //Returns info with command 0x41 [0x01: info, 0x00: no info]

# define ACTIVATED LOW

int buttonNext = 2;
int buttonPause = 3;
int buttonPrevious = 4;
boolean isPlaying = false;

void setup () {

pinMode(buttonPause, INPUT);
digitalWrite(buttonPause,HIGH);
pinMode(buttonNext, INPUT);
digitalWrite(buttonNext,HIGH);
pinMode(buttonPrevious, INPUT);
digitalWrite(buttonPrevious,HIGH);

mySerial.begin (9600);
delay(1000);
playFirst();
isPlaying = true;

}

void loop () {

if (digitalRead(buttonPause) == ACTIVATED)
  {
if(isPlaying)
{
   pause();
   isPlaying = false;
}else
{
   isPlaying = true;
   play();
}
  }

if (digitalRead(buttonNext) == ACTIVATED)
  {
if(isPlaying)
{
   playNext();
}
  }

if (digitalRead(buttonPrevious) == ACTIVATED)
  {
if(isPlaying)
{
   playPrevious();
}
  }
}

void playFirst()
{
  execute_CMD(0x3F, 0, 0);
  delay(500);
  setVolume(20);
  delay(500);
  execute_CMD(0x11,0,1);
  delay(500);
}

void pause()
{
  execute_CMD(0x0E,0,0);
  delay(500);
}

void play()
{
  execute_CMD(0x0D,0,1);
  delay(500);
}

void playNext()
{
  execute_CMD(0x01,0,1);
  delay(500);
}

void playPrevious()
{
  execute_CMD(0x02,0,1);
  delay(500);
}

void setVolume(int volume)
{
  execute_CMD(0x06, 0, volume); // Set the volume (0x00~0x30)
  delay(2000);
}

void execute_CMD(byte CMD, byte Par1, byte Par2)
// Excecute the command and parameters
{
// Calculate the checksum (2 bytes)
word checksum = -(Version_Byte + Command_Length + CMD + Acknowledge + Par1 + Par2);
// Build the command line
byte Command_line[10] = { Start_Byte, Version_Byte, Command_Length, CMD, Acknowledge,
Par1, Par2, highByte(checksum), lowByte(checksum), End_Byte};
//Send the command line to the module
for (byte k=0; k<10; k++)
{
mySerial.write( Command_line[k]);
}
}