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

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+/**
+ * @file streams-audiokit-fft-led.ino
+ * @author Phil Schatzmann
+ * @brief  We peform FFT on the microphone input of the AudioKit and display the
+ * result on a 32*8 LED matrix
+ * @version 0.1
+ * @date 2022-10-14
+ *
+ * @copyright Copyright (c) 2022
+ *
+ */
+#include <FastLED.h> // to prevent conflicts introduced with 3.9
+#include "AudioTools.h"
+#include "AudioTools/AudioLibs/AudioBoardStream.h"
+#include "AudioTools/AudioLibs/AudioRealFFT.h"  // or AudioKissFFT
+#include "AudioTools/AudioLibs/LEDOutput.h"
+
+#define PIN_LEDS 22
+#define LED_X 32
+#define LED_Y 8
+
+AudioBoardStream kit(AudioKitEs8388V1);  // Audio source
+AudioRealFFT fft;    // or AudioKissFFT
+FFTDisplay fft_dis(fft);
+LEDOutput led(fft_dis);       // output to LED matrix
+StreamCopy copier(fft, kit);  // copy mic to fft
+
+void setup() {
+  Serial.begin(115200);
+  AudioToolsLogger.begin(Serial, AudioToolsLogLevel::Info);
+
+  // setup Audiokit as input device
+  auto cfg = kit.defaultConfig(RX_MODE);
+  cfg.input_device = ADC_INPUT_LINE2;
+  kit.begin(cfg);
+
+  // Setup FFT output
+  auto tcfg = fft.defaultConfig();
+  tcfg.length = 1024;
+  tcfg.copyFrom(cfg);
+  fft.begin(tcfg);
+
+  // Setup FFT Display
+  fft_dis.fft_group_bin = 3;
+  fft_dis.fft_start_bin = 0;
+  fft_dis.fft_max_magnitude = 40000;
+  fft_dis.begin();
+
+  // Setup LED matrix output
+  auto lcfg = led.defaultConfig();
+  lcfg.x = LED_X;
+  lcfg.y = LED_Y;
+  led.begin(lcfg);
+
+  // add LEDs
+  FastLED.addLeds<WS2812B, PIN_LEDS, GRB>(led.ledData(), led.ledCount());
+}
+
+void loop() {
+  // update FFT
+  copier.copy();
+  // update LEDs
+  led.update();
+}