Play some music as well

Noise/.gitignore

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

Noise/.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"
+    ]
+}

Noise/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

Noise/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

Noise/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:d1_mini_lite]
+platform = espressif8266
+board = d1_mini_lite
+framework = arduino
+monitor_speed = 115200
+upload_speed = 115200
+
+lib_deps =
+    ESPSoftwareSerial
+    DFRobotDFPlayerMini

Noise/src/main.cpp

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+#include <Arduino.h>
+#include "SoftwareSerial.h"
+#include "DFRobotDFPlayerMini.h"
+#include <ESP8266WiFi.h>
+#include <espnow.h>
+
+SoftwareSerial _softwareSerial(2, 0); // RX, TX
+DFRobotDFPlayerMini _dfPlayer;
+bool _playing = false;
+
+void play() {
+	if (_playing)
+		return;
+
+	Serial.println("Playing");
+	_playing = true;
+	_dfPlayer.randomAll();
+}
+
+void stop() {
+	if (!_playing)
+		return;
+	
+	_playing = false;
+	Serial.println("Stopping");
+	_dfPlayer.stop();
+}
+
+void OnDataRecv(uint8_t* mac, uint8_t* incomingData, uint8_t len) {
+	int playing;
+	memcpy(&playing, incomingData, sizeof(playing));
+	Serial.println(playing);
+
+	playing ? play() : stop();
+}
+
+void setupReceiver() {
+	WiFi.mode(WIFI_STA);
+
+	if (esp_now_init() != 0) {
+		Serial.println("Error initialising ESP-NOW");
+		return;
+	}
+
+	esp_now_set_self_role(ESP_NOW_ROLE_SLAVE);
+	esp_now_register_recv_cb(OnDataRecv);
+}
+
+void handleState(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;
+	}
+}
+
+void setup() {
+	_softwareSerial.begin(9600);
+	Serial.begin(115200);
+	setupReceiver();
+
+	Serial.println();
+	Serial.println(F("DFRobot DFPlayer Mini Demo"));
+	Serial.println(F("Initializing DFPlayer ... (May take 3~5 seconds)"));
+
+	if (!_dfPlayer.begin(_softwareSerial)) {
+		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."));
+
+	_dfPlayer.volume(30); // Max 30
+}
+
+void loop() {
+	if (_dfPlayer.available()) {
+		handleState(_dfPlayer.readType(), _dfPlayer.read());
+	}
+}

Noise/test/README

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+
+This directory is intended for PlatformIO Test Runner 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/en/latest/advanced/unit-testing/index.html