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libraries/audio-tools/examples/examples-stream/streams-generator-volume/streams-generator-volume.ino

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+/**
+ * @file streams-generator-volume.ino
+ * @author Phil Schatzmann
+ * @brief Determines the output volume (=amplitude)
+ * @copyright GPLv3
+ */
+ 
+#include "AudioTools.h"
+
+AudioInfo info(44100, 2, 16);
+SineWaveGenerator<int16_t> sineWave(32000);                // subclass of SoundGenerator with max amplitude of 32000
+GeneratedSoundStream<int16_t> sound(sineWave);             // Stream generated from sine wave
+VolumeMeter out; 
+StreamCopy copier(out, sound, 1024*2);                     // copies sound into VolumeMeter
+
+// Arduino Setup
+void setup(void) {  
+  // Open Serial 
+  Serial.begin(115200);
+  while(!Serial);
+  AudioToolsLogger.begin(Serial, AudioToolsLogLevel::Warning);
+
+  // start Volume Meter
+  out.begin(info);
+
+  // Setup sine wave
+  sineWave.begin(info, N_B4);
+  Serial.println("started...");
+}
+
+// Arduino loop - copy sound to out 
+void loop() {
+  copier.copy();
+  Serial.print(out.volume()); // overall
+  Serial.print(" ");
+  Serial.print(out.volume(0)); // left
+  Serial.print(" ");
+  Serial.println(out.volume(1)); // right
+}