ESP32-AudioInI2S Library for local processing

madlan · May 10, 2024, 9:02am

Has anyone seen this ESP32 Arduino Library by Shea Ivey:

The Frequency example looks like an excellent starting place for those of us with limited bandwidth?

sheaivey/ESP32-AudioInI2S/blob/master/examples/Frequencies/Frequencies.ino

/*
    Frequencies.ino
    By Shea Ivey

    Reads I2S microphone data into samples[], processes them into frequency buckets and then outputs it to the serial plotter for viewing.
    Try wistling differrent tones to see which frequency buckets they fall into.

    TIP: uncomment the audioInfo.autoLevel() to see how the loud and quiet noises are handled.
*/

#include <AudioInI2S.h>

#define SAMPLE_SIZE 1024  // Buffer size of read samples
#define SAMPLE_RATE 44100 // Audio Sample Rate

/* Required defines for audio analysis */
#define BAND_SIZE 8 // powers of 2 up to 64, defaults to 8
#include <AudioAnalysis.h>
AudioAnalysis audioInfo;

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I was thinking to capture the highest frequency and the volume hourly, transmitting these via LoRa and comparing against hive care logs to see any correlation.