First try to output INMP441 to arduin serial plotter
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@@ -33,4 +33,6 @@ monitor_filters = esp32_exception_decoder
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lib_deps =
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https://github.com/pschatzmann/arduino-audio-tools.git
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https://github.com/pschatzmann/arduino-audio-driver.git
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https://github.com/tzapu/WiFiManager.git
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me-no-dev/AsyncTCP
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https://github.com/me-no-dev/ESPAsyncWebServer.git
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138
src/main.cpp
138
src/main.cpp
@@ -1,88 +1,64 @@
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#include "AudioTools.h"
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// #include "AudioTools/AudioLibs/AudioI2SStream.h"
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#include "AudioTools/AudioLibs/AudioRealFFT.h" // or AudioKissFFT
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#include <Arduino.h>
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#include <driver/i2s.h>
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I2SStream i2sStream; // I2S input stream for INMP441
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AudioRealFFT fft; // FFT analyzer
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StreamCopy copier(fft, i2sStream); // copy I2S mic to FFT
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// you shouldn't need to change these settings
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#define SAMPLE_BUFFER_SIZE 512
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#define SAMPLE_RATE 8000
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// most microphones will probably default to left channel but you may need to tie the L/R pin low
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#define I2S_MIC_CHANNEL I2S_CHANNEL_FMT_ONLY_LEFT
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// either wire your microphone to the same pins or change these to match your wiring
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#define I2S_MIC_SERIAL_CLOCK 8
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#define I2S_MIC_LEFT_RIGHT_CLOCK 9
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#define I2S_MIC_SERIAL_DATA 10
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int channels = 1; // INMP441 is mono
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int samples_per_second = 11025;
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int bits_per_sample = 32; // INMP441 sends 24-bit data in 32-bit words
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// don't mess around with this
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i2s_config_t i2s_config = {
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.mode = (i2s_mode_t)(I2S_MODE_MASTER | I2S_MODE_RX),
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.sample_rate = SAMPLE_RATE,
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.bits_per_sample = I2S_BITS_PER_SAMPLE_32BIT,
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.channel_format = I2S_CHANNEL_FMT_ONLY_LEFT,
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.communication_format = I2S_COMM_FORMAT_I2S,
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.intr_alloc_flags = ESP_INTR_FLAG_LEVEL1,
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.dma_buf_count = 4,
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.dma_buf_len = 1024,
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.use_apll = false,
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.tx_desc_auto_clear = false,
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.fixed_mclk = 0};
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const char* solfegeName(uint8_t midiNote) {
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static const char* solfegeNames[] = {
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"Do", "Do#", "Re", "Re#", "Mi", "Fa", "Fa#", "Sol", "Sol#", "La", "La#", "Si"
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};
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return solfegeNames[midiNote % 12];
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}
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// and don't mess around with this
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i2s_pin_config_t i2s_mic_pins = {
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.bck_io_num = I2S_MIC_SERIAL_CLOCK,
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.ws_io_num = I2S_MIC_LEFT_RIGHT_CLOCK,
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.data_out_num = I2S_PIN_NO_CHANGE,
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.data_in_num = I2S_MIC_SERIAL_DATA};
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void fftResult(AudioFFTBase &fft) {
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float diff;
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auto result = fft.result();
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if (result.magnitude > 100) { // avoid noise floor
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float magnitude_dB = 20.0 * log10(result.magnitude);
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float freq = result.frequency;
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// MIDI note number
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int midiNote = round(69 + 12.0 * log2(freq / 440.0));
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const char* solfege = solfegeName(midiNote);
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int octave = (midiNote / 12) - 1;
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Serial.print(freq, 2);
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Serial.print(" Hz | ");
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Serial.print("MIDI ");
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Serial.print(midiNote);
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Serial.print(" | ");
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Serial.print("Note: ");
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Serial.print(result.frequencyAsNote(diff));
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Serial.print(" | ");
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Serial.print("Solfège: ");
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Serial.print(solfege);
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Serial.print(octave);
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Serial.print(" | dB: ");
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Serial.print(magnitude_dB, 2);
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Serial.print(" | Diff: ");
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Serial.println(diff, 2);
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}
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}
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void setup() {
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void setup()
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{
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// we need serial output for the plotter
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Serial.begin(115200);
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AudioToolsLogger.begin(Serial, AudioToolsLogLevel::Warning);
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// Configure I2SStream for INMP441
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auto cfg = i2sStream.defaultConfig(RX_MODE);
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cfg.i2s_format = I2S_STD_FORMAT;
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cfg.bits_per_sample = bits_per_sample;
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cfg.channels = channels;
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cfg.sample_rate = samples_per_second;
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cfg.is_master = true;
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cfg.pin_bck = 8; // SCK
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cfg.pin_ws = 9; // WS
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cfg.pin_data = 10; // SD
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i2sStream.begin(cfg);
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// Configure FFT
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auto tcfg = fft.defaultConfig();
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tcfg.length = 8192; // 186ms @ 11kHz minimun C2 theoretical
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tcfg.channels = channels;
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tcfg.sample_rate = samples_per_second;
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tcfg.bits_per_sample = bits_per_sample;
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tcfg.callback = &fftResult;
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fft.begin(tcfg);
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Serial.println("Setup complete. Listening...");
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// start up the I2S peripheral
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i2s_driver_install(I2S_NUM_0, &i2s_config, 0, NULL);
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i2s_set_pin(I2S_NUM_0, &i2s_mic_pins);
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}
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void loop() {
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copier.copy(); // Stream mic data into FFT processor
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}
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int32_t raw_samples[SAMPLE_BUFFER_SIZE];
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void loop()
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{
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// read from the I2S device
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size_t bytes_read = 0;
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i2s_read(I2S_NUM_0, raw_samples, sizeof(int32_t) * SAMPLE_BUFFER_SIZE, &bytes_read, portMAX_DELAY);
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int samples_read = bytes_read / sizeof(int32_t);
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// dump the samples out to the serial channel.
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for (int i = 0; i < samples_read; i++)
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{
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// False print statements to "lock range" on serial plotter display
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// Change rangelimit value to adjust "sensitivity"
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int rangelimit = 2000000;
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Serial.print(rangelimit * -1);
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Serial.print(" ");
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Serial.print(rangelimit);
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Serial.print(" ");
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Serial.printf("%ld\n", raw_samples[i]);
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}
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}
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