Working version with PIR

vscode/singing_picture_uno/.gitignore

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+.pio
+.vscode/.browse.c_cpp.db*
+.vscode/c_cpp_properties.json
+.vscode/launch.json
+.vscode/ipch

vscode/singing_picture_uno/.vscode/extensions.json

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+{
+    // See http://go.microsoft.com/fwlink/?LinkId=827846
+    // for the documentation about the extensions.json format
+    "recommendations": [
+        "platformio.platformio-ide"
+    ],
+    "unwantedRecommendations": [
+        "ms-vscode.cpptools-extension-pack"
+    ]
+}

vscode/singing_picture_uno/include/README

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+
+This directory is intended for project header files.
+
+A header file is a file containing C declarations and macro definitions
+to be shared between several project source files. You request the use of a
+header file in your project source file (C, C++, etc) located in `src` folder
+by including it, with the C preprocessing directive `#include'.
+
+```src/main.c
+
+#include "header.h"
+
+int main (void)
+{
+ ...
+}
+```
+
+Including a header file produces the same results as copying the header file
+into each source file that needs it. Such copying would be time-consuming
+and error-prone. With a header file, the related declarations appear
+in only one place. If they need to be changed, they can be changed in one
+place, and programs that include the header file will automatically use the
+new version when next recompiled. The header file eliminates the labor of
+finding and changing all the copies as well as the risk that a failure to
+find one copy will result in inconsistencies within a program.
+
+In C, the usual convention is to give header files names that end with `.h'.
+It is most portable to use only letters, digits, dashes, and underscores in
+header file names, and at most one dot.
+
+Read more about using header files in official GCC documentation:
+
+* Include Syntax
+* Include Operation
+* Once-Only Headers
+* Computed Includes
+
+https://gcc.gnu.org/onlinedocs/cpp/Header-Files.html

vscode/singing_picture_uno/lib/README

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+
+This directory is intended for project specific (private) libraries.
+PlatformIO will compile them to static libraries and link into executable file.
+
+The source code of each library should be placed in a an own separate directory
+("lib/your_library_name/[here are source files]").
+
+For example, see a structure of the following two libraries `Foo` and `Bar`:
+
+|--lib
+|  |
+|  |--Bar
+|  |  |--docs
+|  |  |--examples
+|  |  |--src
+|  |     |- Bar.c
+|  |     |- Bar.h
+|  |  |- library.json (optional, custom build options, etc) https://docs.platformio.org/page/librarymanager/config.html
+|  |
+|  |--Foo
+|  |  |- Foo.c
+|  |  |- Foo.h
+|  |
+|  |- README --> THIS FILE
+|
+|- platformio.ini
+|--src
+   |- main.c
+
+and a contents of `src/main.c`:
+```
+#include <Foo.h>
+#include <Bar.h>
+
+int main (void)
+{
+  ...
+}
+
+```
+
+PlatformIO Library Dependency Finder will find automatically dependent
+libraries scanning project source files.
+
+More information about PlatformIO Library Dependency Finder
+- https://docs.platformio.org/page/librarymanager/ldf.html

vscode/singing_picture_uno/platformio.ini

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+; PlatformIO Project Configuration File
+;
+;   Build options: build flags, source filter
+;   Upload options: custom upload port, speed and extra flags
+;   Library options: dependencies, extra library storages
+;   Advanced options: extra scripting
+;
+; Please visit documentation for the other options and examples
+; https://docs.platformio.org/page/projectconf.html
+
+[env:uno]
+platform = atmelavr
+board = uno
+framework = arduino
+monitor_speed = 9600
+lib_deps = dfrobot/DFRobotDFPlayerMini@^1.0.5

vscode/singing_picture_uno/src/main.cpp

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+/***************************************************
+ Durch Wolfgang Ewald modifizierte Version des FullFunction.ino Beispielsketches der DFRobotDFPlayerMini Bibliothek:
+ 
+ DFPlayer - A Mini MP3 Player For Arduino
+ <https://www.dfrobot.com/product-1121.html>
+ 
+ ***************************************************
+ This example shows the all the 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"
+
+SoftwareSerial mySoftwareSerial(10,11); // RX, TX
+DFRobotDFPlayerMini myDFPlayer;
+void printDetail(uint8_t type, int value);
+void readCommand();
+void printHelp();
+
+
+void setup()
+{
+  mySoftwareSerial.begin(9600);
+  Serial.begin(9600);
+  
+  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."));
+  printHelp();
+  
+  myDFPlayer.setTimeOut(500); //Set serial communictaion time out 500ms
+  
+  //----Set volume----
+  myDFPlayer.volume(10);  //Set volume value (0~30).
+ // myDFPlayer.volumeUp(); //Volume Up
+ // myDFPlayer.volumeDown(); //Volume Down
+  
+  //----Set different EQ----
+  myDFPlayer.EQ(DFPLAYER_EQ_NORMAL);
+//  myDFPlayer.EQ(DFPLAYER_EQ_POP);
+//  myDFPlayer.EQ(DFPLAYER_EQ_ROCK);
+//  myDFPlayer.EQ(DFPLAYER_EQ_JAZZ);
+//  myDFPlayer.EQ(DFPLAYER_EQ_CLASSIC);
+//  myDFPlayer.EQ(DFPLAYER_EQ_BASS);
+  
+  //----Set device we use SD as default----
+//  myDFPlayer.outputDevice(DFPLAYER_DEVICE_U_DISK);
+  myDFPlayer.outputDevice(DFPLAYER_DEVICE_SD);
+//  myDFPlayer.outputDevice(DFPLAYER_DEVICE_AUX);
+//  myDFPlayer.outputDevice(DFPLAYER_DEVICE_SLEEP);
+//  myDFPlayer.outputDevice(DFPLAYER_DEVICE_FLASH);
+  
+  //----Mp3 control----
+//  myDFPlayer.sleep();     //sleep
+//  myDFPlayer.reset();     //Reset the module
+//  myDFPlayer.enableDAC();  //Enable On-chip DAC
+//  myDFPlayer.disableDAC();  //Disable On-chip DAC
+//  myDFPlayer.outputSetting(true, 15); //output setting, enable the output and set the gain to 15
+  
+
+}
+
+void loop(){
+  if(Serial.available()){
+    readCommand();
+  }
+ 
+  if (myDFPlayer.available()) {
+    printDetail(myDFPlayer.readType(), myDFPlayer.read()); //Print the detail message from DFPlayer to handle different errors and states.
+  }
+}
+
+void readCommand(){
+  char cmd = ' ';
+  int value1, value2 = 0;
+  cmd = Serial.read();
+  value1 = Serial.parseInt();
+  value2 = Serial.parseInt();
+ 
+  switch(cmd){
+    case 'h': 
+      printHelp();
+      break;
+      
+    case '>':
+      myDFPlayer.next();
+      break;
+      
+    case '<':
+      myDFPlayer.previous();
+      break;
+      
+    case 'p':
+      if(value2 == 0) myDFPlayer.play(value1);
+      else if(value1 != 0) myDFPlayer.playFolder(value1, value2);
+      break;
+
+    case 'P':
+      if(value2 == 0) myDFPlayer.playMp3Folder(value1); 
+      else if(value1 != 0)myDFPlayer.playLargeFolder(value1, value2);
+      break;
+    
+    case '+':
+      myDFPlayer.volumeUp(); 
+      break;
+      
+    case '-':
+      myDFPlayer.volumeDown();
+      break;
+      
+    case 'v':
+      myDFPlayer.volume(value1);
+      break;
+      
+    case 'b':
+      myDFPlayer.pause();
+      break;
+
+    case 's':
+      myDFPlayer.start();
+      break;
+          
+    case 'z':
+      myDFPlayer.sleep();
+      break;
+      
+    case 'L':
+      if(value1 == 0) myDFPlayer.enableLoopAll();
+      else myDFPlayer.loopFolder(value1);
+      break;
+    
+    case 'l':
+      if(value1 == 0) myDFPlayer.disableLoopAll();
+      else myDFPlayer.loop(value1);
+      break;
+    
+    case 'A':
+      myDFPlayer.advertise(value1);
+      break;
+    
+    case 'a':
+      myDFPlayer.stopAdvertise();
+      break;
+    
+    case 'q':
+      if(value1 == 1) Serial.println(myDFPlayer.readState()); 
+      else if(value1 == 2) Serial.println(myDFPlayer.readVolume());
+      else if(value1 == 3) Serial.println(myDFPlayer.readEQ());
+      else if(value1 == 4) Serial.println(myDFPlayer.readFileCounts());
+      else if(value1 == 5) Serial.println(myDFPlayer.readFolderCounts());
+      else if(value1 == 6) Serial.println(myDFPlayer.readCurrentFileNumber());
+      break;
+    default:
+      Serial.println("Ungültiges Kommando");
+      break;
+  }
+
+}
+
+void printHelp(){
+  Serial.println("DFPlayer Commands:");
+  Serial.println(" h - help");
+  Serial.println(" > - next ");
+  Serial.println(" < - previous");
+  Serial.println(" p3 - play");
+  Serial.println(" p3,5 - play folder 3, file 5");
+  Serial.println(" P3,5 - play large folder 3, file 5");
+  Serial.println(" P3 - play file 3 in MP3 folder"); 
+  Serial.println(" + - volume up");
+  Serial.println(" - - volume down");
+  Serial.println(" v10 - set volume to 10");
+  Serial.println(" b - Pause");
+  Serial.println(" s - start ");
+  Serial.println(" z - sleep ");
+  Serial.println(" L - enable loop all");
+  Serial.println(" l - disable loop all");
+  Serial.println(" L3 - loop folder 3");
+  Serial.println(" l3 - loop file 3");
+  Serial.println(" A3 - advertise file 3");
+  Serial.println(" a - stop advertise "); 
+  Serial.println(" qx - query No. x");
+  Serial.println("     x = 1 - read state");
+  Serial.println("     x = 2 - read volume");
+  Serial.println("     x = 3 - read equalizer");
+  Serial.println("     x = 4 - read file counts");
+  Serial.println("     x = 5 - read current file number");
+  Serial.println("     x = 6 - read file counts in folder");
+  Serial.println("     x = 7 - read folder counts");
+}
+
+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;
+  }  
+}

vscode/singing_picture_uno/test/README

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+
+This directory is intended for PlatformIO Unit Testing and project tests.
+
+Unit Testing is a software testing method by which individual units of
+source code, sets of one or more MCU program modules together with associated
+control data, usage procedures, and operating procedures, are tested to
+determine whether they are fit for use. Unit testing finds problems early
+in the development cycle.
+
+More information about PlatformIO Unit Testing:
+- https://docs.platformio.org/page/plus/unit-testing.html