MAX98357 I2S 3 W Class-D DAC Audio Amplifier

// Arduino Bluetooth A2DP Sink C++ kód
#include "BluetoothA2DPSink.h"

BluetoothA2DPSink a2dp_sink;

// Callback pre ovládanie hlasitosti
void volume_control_callback(int volume) {
    Serial.printf("Current Volume: %d\n", volume);
}

// Callback pre prijímanie metaúdajov médií
void avrc_metadata_callback(uint8_t attribute_id, const uint8_t *value) {
    if (value == nullptr) {
        return;
    }
    // Konverzia z uint8_t na char
    String metadata = String((const char *)value);

    switch (attribute_id) {
        case 1: // Názov
            Serial.printf("Title: %s\n", metadata.c_str());
            break;
        case 2: // Interpret
            Serial.printf("Artist: %s\n", metadata.c_str());
            break;
    }
}

void setup() {
    Serial.begin(115200);

    // I2S konfigurácia
    i2s_pin_config_t my_pin_config = {
        .bck_io_num = 26, // BCLK
        .ws_io_num = 25,  // LRC
        .data_out_num = 27, // Din
        .data_in_num = I2S_PIN_NO_CHANGE
    };
    a2dp_sink.set_pin_config(my_pin_config);

    // Callback funkcie
    a2dp_sink.set_on_volumechange(volume_control_callback);
    a2dp_sink.set_avrc_metadata_callback(avrc_metadata_callback);

    a2dp_sink.start("DENUINO");
    Serial.println("Bluetooth A2DP Sink Started");
}

void loop() {
    if (Serial.available()) {
        String command = Serial.readStringUntil('\n');
        command.trim();

        if (command == "volume") {
            Serial.println("Enter volume intensity (1-100):");
            while (!Serial.available()) {
                delay(10); // Čaká, kým prídu dáta
            }
            int volume = Serial.parseInt();
            if (volume >= 1 && volume <= 100) {
                a2dp_sink.set_volume(volume);
                Serial.printf("Volume set to: %d\n", volume);
            } else {
                Serial.println("Invalid volume value. Please enter a value between 1 and 100.");
            }
        } else if (command == "media data") {
            Serial.println("Requesting media metadata...");
            // Metaúdaje sa automaticky zobrazia pomocou callback funkcie
        } else {
            Serial.println("Unknown command. Use 'volume' or 'media data'.");
        }
    }
}