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libraries/audio-tools/examples/examples-communication/a2dp/basic-a2dp-fft-led/basic-a2dp-fft-led.ino

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+/**
+ * @file basic-a2dp-fft-led.ino
+ * @brief A2DP Sink with output of the FFT result to the LED matrix   
+ * For details see the FFT Wiki: https://github.com/pschatzmann/arduino-audio-tools/wiki/FFT
+ * @author Phil Schatzmann
+ * @copyright GPLv3
+ */
+
+#include <FastLED.h> // to prevent conflicts introduced with 3.9
+#include "AudioTools.h"
+#include "AudioTools/AudioLibs/AudioRealFFT.h" // or any other supported inplementation
+#include "AudioTools/AudioLibs/LEDOutput.h"
+#include "BluetoothA2DPSink.h"
+
+#define PIN_LEDS 22
+#define LED_X 32
+#define LED_Y 8
+
+BluetoothA2DPSink a2dp_sink;
+AudioRealFFT fft; // or any other supported inplementation
+FFTDisplay fft_dis(fft);
+LEDOutput led(fft_dis); // output to LED matrix
+
+// Provide data to FFT
+void writeDataStream(const uint8_t *data, uint32_t length) {
+  fft.write(data, length);
+}
+
+void setup() {
+  Serial.begin(115200);
+  AudioToolsLogger.begin(Serial, AudioToolsLogLevel::Info);
+
+  // Setup FFT
+  auto tcfg = fft.defaultConfig();
+  tcfg.length = 1024;
+  tcfg.channels = 2;
+  tcfg.sample_rate = a2dp_sink.sample_rate();;
+  tcfg.bits_per_sample = 16;
+  fft.begin(tcfg);
+
+  // Setup LED matrix output
+  auto lcfg = led.defaultConfig();
+  lcfg.x = LED_X;
+  lcfg.y = LED_Y;
+  led.begin(lcfg);
+
+  fft_dis.fft_group_bin = 3;
+  fft_dis.fft_start_bin = 0;
+  fft_dis.fft_max_magnitude = 40000;
+  fft_dis.begin();
+
+  // add LEDs
+  FastLED.addLeds<WS2812B, PIN_LEDS, GRB>(led.ledData(), led.ledCount());
+
+  // register A2DP callback
+  a2dp_sink.set_stream_reader(writeDataStream, false);
+
+  // Start Bluetooth Audio Receiver
+  Serial.print("starting a2dp-fft...");
+  a2dp_sink.set_auto_reconnect(false);
+  a2dp_sink.start("a2dp-fft");
+
+}
+
+void loop() { 
+  led.update();
+  delay(50);
+}