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libraries/audio-tools/examples/examples-audiokit/streams-audiokit-fft/README.md

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+## FFT
+
+I found some cheap [AI Thinker ESP32 Audio Kit V2.2](https://docs.ai-thinker.com/en/esp32-audio-kit) on AliExpress and because I was tired of all the wires I had to connect to implement my different scenarios that are possible with my [Arduino Audio Tools Library](https://github.com/pschatzmann/arduino-audio-tools), I thought it to be a good idea to buy this board.
+
+<img src="https://pschatzmann.github.io/Resources/img/audio-toolkit.png" alt="Audio Kit" />
+
+You dont need to bother about any wires because everything is on one nice board. Just just need to install the dependencies
+
+The fast Fourier transform (FFT) can be used to determine the frequencies of a singal. More [details can be found in the Wiki](https://github.com/pschatzmann/arduino-audio-tools/wiki/FFT)
+
+### Note
+
+The log level has been set to Info to help you to identify any problems. Please change it to AudioLogger::Warning to get the best sound quality!
+
+
+## Dependencies
+
+You need to install the following libraries:
+
+- https://github.com/pschatzmann/arduino-audio-tools
+- https://github.com/pschatzmann/arduino-audio-driver

libraries/audio-tools/examples/examples-audiokit/streams-audiokit-fft/streams-audiokit-fft.ino

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+
+#include "AudioTools.h"
+#include "AudioTools/AudioLibs/AudioBoardStream.h"
+#include "AudioTools/AudioLibs/AudioRealFFT.h" // or AudioKissFFT
+
+AudioBoardStream kit(AudioKitEs8388V1);  // Audio source
+AudioRealFFT fft; // or AudioKissFFT
+StreamCopy copier(fft, kit);  // copy mic to tfl
+int channels = 2;
+int samples_per_second = 44100;
+int bits_per_sample = 16;
+float value=0;
+
+// display fft result
+void fftResult(AudioFFTBase &fft){
+    float diff;
+    auto result = fft.result();
+    if (result.magnitude>100){
+        Serial.print(result.frequency);
+        Serial.print(" ");
+        Serial.print(result.magnitude);  
+        Serial.print(" => ");
+        Serial.print(result.frequencyAsNote(diff));
+        Serial.print( " diff: ");
+        Serial.println(diff);
+    }
+}
+
+void setup() {
+  Serial.begin(115200);
+  AudioToolsLogger.begin(Serial, AudioToolsLogLevel::Warning);
+
+  // setup Audiokit
+  auto cfg = kit.defaultConfig(RX_MODE);
+  cfg.input_device = ADC_INPUT_LINE2;
+  cfg.channels = channels;
+  cfg.sample_rate = samples_per_second;
+  cfg.bits_per_sample = bits_per_sample;
+  kit.begin(cfg);
+
+  // Setup FFT
+  auto tcfg = fft.defaultConfig();
+  tcfg.length = 8192;
+  tcfg.channels = channels;
+  tcfg.sample_rate = samples_per_second;
+  tcfg.bits_per_sample = bits_per_sample;
+  tcfg.callback = &fftResult;
+  fft.begin(tcfg);
+}
+
+void loop() { 
+  copier.copy();
+}