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libraries/audio-tools/examples/examples-dsp/examples-stk/streams-stk_generator-audiokit/streams-stk_generator-audiokit.ino

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+/**
+ * @file streams-stk-a2dp.ino
+ * @author Phil Schatzmann
+ * @brief The Synthesis ToolKit in C++ (STK) is a set of open source audio signal processing and algorithmic synthesis classes written in the C++ programming language. 
+ * @author Phil Schatzmann
+ * @copyright GPLv3
+ */
+
+#include "AudioTools.h"
+#include "AudioTools/AudioLibs/AudioSTK.h" // install https://github.com/pschatzmann/Arduino-STK
+#include "AudioTools/AudioLibs/AudioBoardStream.h" // install https://github.com/pschatzmann/arduino-audio-driver
+
+Clarinet clarinet(440); // the stk clarinet instrument
+STKGenerator<Instrmnt, int16_t> generator(clarinet);    // subclass of SoundGenerator
+GeneratedSoundStream<int16_t> in(generator);  // Stream generated from sine wave
+AudioBoardStream out(AudioKitEs8388V1);
+StreamCopy copier(out, in); // copy stkStream to a2dpStream
+MusicalNotes notes; // notes with frequencies
+
+// Arduino Setup
+void setup(void) {
+    Serial.begin(115200);
+    AudioToolsLogger.begin(Serial, AudioToolsLogLevel::Warning);
+    
+    // start Output
+    Serial.println("starting Analog Output...");
+    out.begin(out.defaultConfig());
+
+    // start STK input with default configuration
+    Serial.println("starting STK...");
+    auto cfgSTK = in.defaultConfig();
+    cfgSTK.channels = 2;
+    in.addNotifyAudioChange(out);
+    in.begin(cfgSTK);
+
+}
+
+void playNoteStk() {
+    static unsigned long timeout=0;
+    static int note = 60;
+    static bool isNoteOn = false;
+
+    if (!isNoteOn) {
+      if (millis()>timeout) {
+          // play note for 1000 ms
+          note += rand() % 10 - 5; // generate some random offset
+          float frequency = notes.frequency(note);
+          clarinet.noteOn( frequency, 0.5 );
+  
+          // set timeout
+          timeout = millis()+1000;
+      }
+    } else {
+      if (millis()>timeout) {
+        // switch note off for 200 ms 
+        clarinet.noteOff(0.5);
+        
+        // set timeout
+        timeout = millis()+200; 
+      }           
+    }
+    isNoteOn = !isNoteOn;
+    
+}
+
+
+// Arduino loop - copy data
+void loop() {
+    playNoteStk();
+    copier.copy();
+}