Bluetooth boombox

[Alfred586]

The power of two cores!
Thanks for your support @pschatzmann
Sink mode, avrcp commands, metadata and fast fourier transform

[tankhunter8192]

nice build, what kind of i2s module did you use for that?

[Alfred586]

Thanks.
It is a custom board made by myself.
Contains a PCM5102 DAC, Esp32, and a raspberry pi display.

[RWBRWB]

What code did you use for the FFT? does that work on Web Audio Streams also?

[Alfred586]

Hello.
arduinoFFT library, and yes it works whith any class of signal you put in
You only have to fill the fft Real array with your music data.

For example:

int m = 0;
void read_data_stream(const uint8_t *data_stream, uint32_t len) // Function to acquire the music data
{
int16_t values = (int16_t) data_stream;
int m = 0;
for (int j=0; j<len/2; j+=2){
mBuffer[m] = ((values[j] + values[j+1])/2); // Mix the two channels
m += 1;
}
}

for (int i = 0; i < SAMPLES; i++) {
newTime = micros();
vReal[i] = map(mBuffer[i], -32767, 32767, 0, 4096); // Fill the real data buffer
vImag[i] = 0;

while ((micros() - newTime) < sampling_period_us) {
// do nothing to wait
yield();
}
}

Cheers.

[pschatzmann]

I would also suggest that you have a look at the FFT functionality provided by the Arduino Audio Tools. There this is just one of the many Audio Sinks that you can write or copy the audio data to...
See also pschatzmann/arduino-audio-tools#240

[msaraswat15031997]

Wow, this is all that I need. I am working on a similar project. I need to do all that you've done and I'm a beginner . Can I please see understand and learn from your code. Much appreciated thanks 🙏