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libraries/Adafruit_CircuitPlayground/utility/Adafruit_CPlay_Mic.h

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+// Adafruit Circuit Playground microphone library
+// by Phil Burgess / Paint Your Dragon.
+// Fast Fourier transform section is derived from
+// ELM-ChaN FFT library (see comments in ffft.S).
+
+#ifndef ADAFRUIT_CPLAY_MIC_H
+#define ADAFRUIT_CPLAY_MIC_H
+
+class Adafruit_CPlay_Mic {
+ public:
+  Adafruit_CPlay_Mic(void) {}; // Empty constructor
+  int  peak(uint16_t ms);
+  void capture(int16_t *buf, uint8_t nSamples),
+       fft(uint16_t *spectrum);
+};
+
+#endif // ADAFRUIT_CPLAY_MIC_H