Bluetooth DFPlayer rev_01

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    - Project: Bluetooth DFPlayer
    - Source Code NOT compiled for: Arduino Uno
    - Source Code created on: 2025-12-07 11:36:17

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/****** SYSTEM REQUIREMENTS *****/
/****** SYSTEM REQUIREMENT 1 *****/
    /* Create a project for controlling media playback */
    /* with DFRobotDFPlayerMini connected to Arduino Uno, */
    /* triggered through Bluetooth commands received from */
    /* HC-05, with data stored or retrieved from the SD */
    /* card. */
/****** END SYSTEM REQUIREMENTS *****/


/* START CODE */

// Project for controlling media playback with Bluetooth commands via Bluetooth HC-05, with SD card support
// using DFRobotDFPlayerMini, BluetoothSerial, and SoftwareSerial libraries
#include <SoftwareSerial.h>
#include <DFRobotDFPlayerMini.h>
#include <BluetoothSerial.h>
#include <SPI.h>
#include <SD.h>

// Define pins for Bluetooth HC-05 module
const uint8_t BT_HC05_mySerial_PIN_SERIAL_TX_A0 = A0;
const uint8_t BT_HC05_mySerial_PIN_SERIAL_RX_A1 = A1;
SoftwareSerial bluetoothSerial(BT_HC05_mySerial_PIN_SERIAL_RX_A1, BT_HC05_mySerial_PIN_SERIAL_TX_A0);

// Create DFPlayer Mini object
DFRobotDFPlayerMini mediaPlayer;

// Bluetooth Serial object
BluetoothSerial btSerial(Serial1, true);

// SD card chip select pin
const int chipSelect = 4;

// Media control commands
enum MediaCommand {
  PLAY = '1',
  PAUSE = '2',
  STOP = '3',
  NEXT = '4',
  PREVIOUS = '5',
  VOLUME_UP = '6',
  VOLUME_DOWN = '7'
};

// Buffer for incoming Bluetooth data
String incomingData = "";

void setup() {
  // Initialize serial communication for debugging
  Serial.begin(115200);

  // Initialize Bluetooth serial
  bluetoothSerial.begin(9600);
  Serial.println("Bluetooth serial started at 9600") ;

  // Initialize SD card
  if (!SD.begin(chipSelect)) {
    Serial.println("SD card initialization failed!");
    while (true); // halt if SD not found
  }
  Serial.println("SD card initialized.");

  // Initialize DFPlayer Mini
  delay(1000); // Allow some time for initialization
  mediaPlayer.begin(Serial);
  delay(100); // Wait for the library to initialize
  mediaPlayer.volume(20); // Set initial volume
  Serial.println("DFPlayer Mini initialized.");
}

void loop() {
  // Check for Bluetooth data
  if (bluetoothSerial.available()) {
    char c = bluetoothSerial.read();
    if (c == '\n') {
      // Process command
      processCommand(incomingData);
      incomingData = ""; // Reset buffer
    } else {
      // Append character to buffer
      incomingData += c;
    }
  }
}

// Function to process received command
void processCommand(String command) {
  if (command.length() == 0) return;
  char cmd = command.charAt(0);
  switch (cmd) {
    case MediaCommand.PLAY:
      mediaPlayer.play(1); // Play first track, or implement specific logic
      Serial.println("Play command received") ;
      break;
    case MediaCommand.PAUSE:
      mediaPlayer.pause();
      Serial.println("Pause command received") ;
      break;
    case MediaCommand.STOP:
      mediaPlayer.stop();
      Serial.println("Stop command received") ;
      break;
    case MediaCommand.NEXT:
      mediaPlayer.next();
      Serial.println("Next command received") ;
      break;
    case MediaCommand.PREVIOUS:
      mediaPlayer.previous();
      Serial.println("Previous command received") ;
      break;
    case MediaCommand.VOLUME_UP:
      volumeUp();
      Serial.println("Volume Up command received") ;
      break;
    case MediaCommand.VOLUME_DOWN:
      volumeDown();
      Serial.println("Volume Down command received") ;
      break;
    default:
      Serial.print("Unknown command: ");
      Serial.println(command);
  }
}

// Volume up function
void volumeUp() {
  int vol = mediaPlayer.readVolume();
  if (vol < 30) { // Max volume
    mediaPlayer.volume(vol + 1);
  }
}

// Volume down function
void volumeDown() {
  int vol = mediaPlayer.readVolume();
  if (vol > 0) { // Min volume
    mediaPlayer.volume(vol - 1);
  }
}

/* END CODE */