======  Salon d'écoute ======
Fauteuils maison, des casques et un lecteurs automatiques de fichiers sons sur microSD.
  * FORDLANDIA  : Dominique Leroy & Florence Jou.
  * Tracticosme : Antoine Freychet.

Pour ce premier lecteur, nous utiliserons un simple mode player, plus tard peut etre une interface Wifi...

Base matérielle:
  * [[ https://www.dfrobot.com/product-1121.html | DFPlayer]] , lecteur microSD audio 
  * ESP8266 Wemos
  * amplificateur 2 canaux
  * batterie 12V

code de base, de l'exemple du fournisseur : https://wiki.dfrobot.com/DFPlayer_Mini_SKU_DFR0299#Connection_Diagram

<code c>
/***************************************************
DFPlayer - A Mini MP3 Player ESP8266
 <https://www.dfrobot.com/product-1121.html>
 
 *************************************************** 
 Created 2016-12-07
 By [Angelo qiao](Angelo.qiao@dfrobot.com)
 Modif Gepeto@du-libre.org  2023
 
 Lit en boucle le premier fichier de la microSD
 
 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***************
 Connection and Diagram can be found here
 <https://www.dfrobot.com/wiki/index.php/DFPlayer_Mini_SKU:DFR0299#Connection_Diagram>
 ****************************************************/

#include "Arduino.h"
#include "SoftwareSerial.h"
#include "DFRobotDFPlayerMini.h"

SoftwareSerial mySoftwareSerial(D1, D2); // 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){
      delay(0); // Code to compatible with ESP8266 watch dog.
    }
  }
  Serial.println(F("DFPlayer Mini online."));
  /* myDFPlayer.EQ(DFPLAYER_EQ_NORMAL); */
  myDFPlayer.EQ(DFPLAYER_EQ_ROCK);
  myDFPlayer.volume(25);  //Set volume value. From 0 to 30
  myDFPlayer.loop(1);  //Play the first mp3 en boucle
  Serial.println(F("boucle sur le premier"));
}

void loop()
{
/*  static unsigned long timer = millis();
  if (millis() - timer > 300000) {
    timer = millis();
    myDFPlayer.next();  //Play next mp3 every 3 second.
  }
*/ 
  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 DFPlayerUSBInserted:
      Serial.println("USB Inserted!");
      break;
    case DFPlayerUSBRemoved:
      Serial.println("USB Removed!");
      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;
  }
  
}
</code>