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libraries/audio-tools/examples/examples-communication/a2dp/basic-a2dp-eq-audiokit/README.md

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+## Using the AI Thinker ESP32 Audio Kit as A2DP Receiver with Equalizer
+
+I found some cheap [AI Thinker ESP32 Audio Kit V2.2](https://docs.ai-thinker.com/en/esp32-audio-kit) on AliExpress.
+
+<img src="https://pschatzmann.github.io/Resources/img/audio-toolkit.png" alt="Audio Kit" />
+
+I am using the data callback of the A2DP library to feed the AudioBoardStream that will be controlled by an Equalizer
+
+You dont need to bother about any wires because everything is on one nice board. Just just need to install the dependencies:
+
+## Dependencies
+
+You need to install the following libraries:
+
+- https://github.com/pschatzmann/arduino-audio-tools
+- https://github.com/pschatzmann/ESP32-A2DP
+- https://github.com/pschatzmann/arduino-audio-driver

libraries/audio-tools/examples/examples-communication/a2dp/basic-a2dp-eq-audiokit/basic-a2dp-eq-audiokit.ino

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+/**
+ * @file basic-a2dp-audiokit.ino
+ * @brief see https://github.com/pschatzmann/arduino-audio-tools/blob/main/examples/examples-audiokit/basic-a2dp-audiokit/README.md
+ * 
+ * @author Phil Schatzmann
+ * @copyright GPLv3
+ */
+
+#include "AudioTools.h"
+#include "AudioTools/Communication/A2DPStream.h" // install https://github.com/pschatzmann/ESP32-A2DP
+#include "AudioTools/AudioLibs/AudioBoardStream.h" // install https://github.com/pschatzmann/arduino-audio-driver
+
+
+BluetoothA2DPSink a2dp_sink;
+AudioBoardStream kit(AudioKitEs8388V1); 
+Equalizer3Bands eq(kit);
+ConfigEqualizer3Bands cfg_eq;
+
+
+// Write data to AudioKit in callback
+void read_data_stream(const uint8_t *data, uint32_t length) {
+    eq.write(data, length);
+}
+
+void setup() {
+  Serial.begin(115200);
+  AudioToolsLogger.begin(Serial, AudioToolsLogLevel::Info);
+
+  // setup output
+  auto cfg = kit.defaultConfig(TX_MODE);
+  cfg.sd_active = false;
+  kit.begin(cfg);
+
+  // max volume
+  kit.setVolume(1.0);
+
+  // setup equilizer
+  cfg_eq = eq.defaultConfig();
+  cfg_eq.setAudioInfo(cfg); // use channels, bits_per_sample and sample_rate from kit
+  cfg_eq.gain_low = 0.5; 
+  cfg_eq.gain_medium = 0.5;
+  cfg_eq.gain_high = 1.0;
+  eq.begin(cfg_eq);
+
+  // register callback
+  a2dp_sink.set_stream_reader(read_data_stream, false);
+  a2dp_sink.start("AudioKit");
+}
+
+void loop() {
+}