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libraries/audio-tools/examples/sandbox/streams-generator-freq/streams-generator-freq.ino

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+/**
+ * @file streams-generator-freq.ino
+ * @brief Test frequency detection
+ * @author Phil Schatzmann
+ * @copyright GPLv3
+ **/
+ 
+#include "AudioTools.h"
+#include "Experiments/FrequencyDetection.h"
+
+AudioInfo info(16000, 1, 16);
+SineWaveGenerator<int16_t> sineWave(32000);                // subclass of SoundGenerator with max amplitude of 32000
+GeneratedSoundStream<int16_t> sound(sineWave);             // Stream generated from sine wave
+FrequncyZeroCrossingStream out; // or use FrequncyAutoCorrelationStream
+StreamCopy copier(out, sound);  
+MusicalNotes notes;                           // copies sound into i2s
+int idx = 0;
+
+// Arduino Setup
+void setup(void) {  
+  // Open Serial 
+  Serial.begin(115200);
+  AudioToolsLogger.begin(Serial, AudioToolsLogLevel::Warning);
+
+  // start the analog output
+  out.begin(info);
+
+  // Setup sine wave
+  Serial.println("started...");
+}
+
+// Arduino loop - copy sound to out 
+void loop() {
+  float freq = notes.frequency(idx);
+  sineWave.begin(info, freq);
+  copier.copy();
+
+  // print result
+  Serial.print(notes.note(freq));
+  Serial.print(" ");
+  Serial.print(notes.frequency(idx));
+  Serial.print("->");
+  Serial.print(out.frequency(0));
+  Serial.print(" ");
+  Serial.println(notes.note(out.frequency(0)));
+
+  if (++idx >= notes.frequencyCount()) stop();
+}