Added volume adjustment via software serial.

vscode/.vscode/settings.json

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+{
+    "svn.ignoreMissingSvnWarning": true
+}

vscode/singing_picture/src/main.cpp

@@ -1,7 +1,7 @@
 
 #include <Arduino.h>
 #define MV_ONE_IS_PLAYING 3100
-#define MS_TO_WAIT_BEFORE_NEXT_MOVE 10000     //ms to wait before new movement is valid
+#define MS_TO_WAIT_BEFORE_NEXT_MOVE 120000     //ms to wait before new movement is valid
 #define MS_TO_WAIT_BEFORE_VALID_NO_MOVEMEVENT 5000 //ms a no movement phase must be
 #define MS_TO_WAIT_BEFORE_NEXT_PRESS 200
 

vscode/singing_picture_serial/.gitignore

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

vscode/singing_picture_serial/.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_serial/.vscode/settings.json

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+{
+    "svn.ignoreMissingSvnWarning": true
+}

vscode/singing_picture_serial/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_serial/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_serial/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:lolin32]
+platform = espressif32
+board = lolin32
+framework = arduino
+monitor_speed = 115200
+board_build.f_cpu = 80000000L

vscode/singing_picture_serial/src/main.cpp

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+
+#include <Arduino.h>
+#define MV_ONE_IS_PLAYING 3100
+#define MS_TO_WAIT_BEFORE_NEXT_MOVE 120000     //ms to wait before new movement is valid
+#define MS_TO_WAIT_BEFORE_VALID_NO_MOVEMEVENT 5000 //ms a no movement phase must be
+#define MS_TO_WAIT_BEFORE_NEXT_PRESS 200
+
+const uint8_t vol_poti_pin = 35;
+const uint8_t vol_down_out = 17;
+const uint8_t button_vol_down = 5;
+const uint8_t button_vol_up = 18;
+const uint8_t button_pin = 2;
+const uint8_t movesensor_pin = 4;
+const uint8_t busyanalog_pin = 36; // to get status of all players
+const uint8_t blue_isplaying_led_pin = 22;
+const uint8_t red_button_pressed_led_pin = 19;
+const uint8_t red_movement_detected_led_pin = 19;
+const uint8_t mp3player_control_pin[] = {15,13,12,14,27,26,25,33,32};
+const uint8_t mp3player_nr = sizeof(mp3player_control_pin)/sizeof(mp3player_control_pin[0]);
+
+
+
+#include "SoftwareSerial.h"
+#include "DFRobotDFPlayerMini.h"
+
+SoftwareSerial mySoftwareSerial(19, 23); // RX, TX
+DFRobotDFPlayerMini myDFPlayer;
+
+void play_sequence(void);
+void check_players_state(void);
+void check_button(void);
+void check_movement(void);
+void set_volume(void);
+
+void setup()
+{
+  Serial.begin(115200);
+  Serial.println("Setting button,movement sensor pin to input.");
+  pinMode(vol_down_out, INPUT);
+  digitalWrite(vol_down_out,HIGH);
+  pinMode(button_vol_up, INPUT_PULLUP);
+  pinMode(button_pin, INPUT_PULLUP);
+  pinMode(movesensor_pin, INPUT_PULLDOWN);  
+  Serial.println("Setting all control pins to outputs and disable playing.");
+  for(uint8_t ix = 0; ix < mp3player_nr; ix++)
+  {
+    pinMode(mp3player_control_pin[ix], OUTPUT);
+    digitalWrite(mp3player_control_pin[ix],HIGH);
+    pinMode(mp3player_control_pin[ix], INPUT);
+  }
+
+  mySoftwareSerial.begin(9600);
+  myDFPlayer.begin(mySoftwareSerial);
+  if (!myDFPlayer.begin(mySoftwareSerial, false)) {  //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."));
+  set_volume();
+
+
+  
+  
+
+}
+
+bool movement = false;
+bool there_was_no_movement_in_between = true;
+bool is_playing = false;
+bool button_pressed = false;
+bool button_upvol_pressed = false;
+bool button_downvol_pressed = false;
+unsigned long last_move_ms = 0;
+unsigned long last_no_move_ms = 0;
+unsigned long last_button_ms = 0;
+unsigned long last_upvol_button_ms = 0;
+unsigned long last_downvol_button_ms = 0;
+
+void loop()
+{
+  check_players_state();
+  check_movement();
+  check_button();
+  set_volume();
+  play_sequence();
+  delay(100);
+}
+
+void set_volume(void)
+{
+  static long last_vol = 0;
+  uint16_t vol_poti = analogRead(vol_poti_pin);
+  long vol_mp3 = map(vol_poti, 0, 4095, 2 , 30);
+  if(last_vol != vol_mp3)
+  {
+    myDFPlayer.volume(vol_mp3);  //Set volume value. From 0 to 30  
+    last_vol = vol_mp3;
+  }
+
+}
+
+
+void check_button(void)
+{
+ if( MS_TO_WAIT_BEFORE_NEXT_PRESS < millis() - last_button_ms)
+ {
+   if(false == button_pressed && LOW == digitalRead(button_pin))
+   {
+    Serial.println("Button pressed ...");
+    last_button_ms = millis();
+    button_pressed = true;
+   }
+ }
+
+ if( MS_TO_WAIT_BEFORE_NEXT_PRESS < millis() - last_upvol_button_ms)
+ {
+   if(false == button_upvol_pressed && LOW == digitalRead(button_vol_up))
+   {
+    Serial.println("Volume up button pressed ...");
+    last_upvol_button_ms = millis();
+    button_upvol_pressed = true;
+   }
+ }
+
+  if( MS_TO_WAIT_BEFORE_NEXT_PRESS < millis() - last_downvol_button_ms)
+ {
+   if(false == button_downvol_pressed && LOW == digitalRead(button_vol_down))
+   {
+    Serial.println("Volume down button pressed ...");
+    last_downvol_button_ms = millis();
+    button_downvol_pressed = true;
+   }
+ }
+
+}
+
+void check_movement(void)
+{
+  int act_movement = digitalRead(movesensor_pin);
+  if(act_movement == HIGH)
+    Serial.println("Movement.");
+  //  Serial.println("No movement.");
+  //else
+  
+  //
+  if(LOW == act_movement )
+  {
+    if( false == there_was_no_movement_in_between)
+    {
+      if(MS_TO_WAIT_BEFORE_VALID_NO_MOVEMEVENT < millis()-last_no_move_ms)
+      {
+        there_was_no_movement_in_between = true;
+        Serial.printf("No movement anymore ...\n");
+      }
+    }    
+  }
+  else
+  {
+    last_no_move_ms = millis();
+  }
+  
+  if( true == is_playing)
+  {
+    last_move_ms = millis();
+  }
+  else
+  {  
+    if(HIGH == act_movement && true == there_was_no_movement_in_between)
+    {
+      there_was_no_movement_in_between = false;
+      if(MS_TO_WAIT_BEFORE_NEXT_MOVE < millis()-last_move_ms)
+      {
+        last_move_ms = millis();
+        movement = true;
+        Serial.printf("New movement detected ...\n");
+      }
+    }
+  }
+}
+
+void check_players_state(void)
+{
+  // 0 ... 0V - 4095 ... 3.3V
+  uint16_t voltage_dig = analogRead(busyanalog_pin);
+  uint16_t voltage_mV = map(voltage_dig,0,4095,0,3300); 
+  //Serial.printf("Voltage at busy pins is: dig=%d , ana=%dmV\n", voltage_dig, voltage_mV);
+  if(voltage_mV < MV_ONE_IS_PLAYING)
+  {
+    if(false == is_playing)
+    {
+      Serial.println("At least one player is playing now.");
+    }
+    is_playing = true;
+  }
+  else
+  {
+    if(true == is_playing)
+    {
+      Serial.println("All players off now.");
+    } 
+    is_playing = false;
+  }
+}
+
+void play_sequence(void)
+{
+  if(false == is_playing)
+  {
+    //Serial.println("All players still off .");
+    if(true == button_pressed || true == movement )
+    {
+      Serial.println("All players starting now.");
+      for(uint8_t ix= 0; ix < mp3player_nr; ix++)
+      { 
+        pinMode(mp3player_control_pin[ix],OUTPUT);
+        digitalWrite(mp3player_control_pin[ix],LOW);
+      }
+      Serial.println("All players started.");
+      delay(500);
+      for(uint8_t ix= 0; ix < mp3player_nr; ix++)
+      {
+        digitalWrite(mp3player_control_pin[ix],HIGH);
+        pinMode(mp3player_control_pin[ix],INPUT);
+      }  
+      is_playing = true;
+    }
+  }
+  button_pressed = false;
+  movement = false;
+}

vscode/singing_picture_serial/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