micro
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src/main.cpp
120
src/main.cpp
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/*
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ESP32 I2S Microphone Sample
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esp32-i2s-mic-sample.ino
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Sample sound from I2S microphone, display on Serial Plotter
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Requires INMP441 I2S microphone
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DroneBot Workshop 2022
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https://dronebotworkshop.com
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*/
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#include <Arduino.h>
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const int potPin = 33;
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//la valeur du potentiomètre
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// Include I2S driver
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#include <driver/i2s.h>
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// Connections to INMP441 I2S microphone
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#define I2S_WS 25
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#define I2S_SD 33
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#define I2S_SCK 32
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float potvalue=0.00;
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// Use I2S Processor 0
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#define I2S_PORT I2S_NUM_0
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// Define input buffer length
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#define bufferLen 1024
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int16_t sBuffer[bufferLen];
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void setup() {
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//pinMode(potPin,INPUT);
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Serial.begin(9600);
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void i2s_install()
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{
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// Set up I2S Processor configuration
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const 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 = 40000,
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.bits_per_sample = i2s_bits_per_sample_t(16),
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.channel_format = I2S_CHANNEL_FMT_ONLY_LEFT,
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.communication_format = i2s_comm_format_t(I2S_COMM_FORMAT_STAND_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 = bufferLen,
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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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i2s_driver_install(I2S_PORT, &i2s_config, 0, NULL);
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}
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void loop() {
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void i2s_setpin()
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{
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// Set I2S pin configuration
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const i2s_pin_config_t pin_config = {
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.bck_io_num = I2S_SCK,
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.ws_io_num = I2S_WS,
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.data_out_num = -1,
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.data_in_num = I2S_SD};
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//mesure la valeur du potentiomtre
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potvalue=analogRead(potPin);
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Serial.println (potvalue);
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delay(1000);
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}
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i2s_set_pin(I2S_PORT, &pin_config);
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}
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void setup()
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{
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// Set up Serial Monitor
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Serial.begin(115200);
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Serial.println(" ");
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delay(1000);
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// Set up I2S
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i2s_install();
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i2s_setpin();
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i2s_start(I2S_PORT);
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delay(500);
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}
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void loop()
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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 = 3000;
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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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// Get I2S data and place in data buffer
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size_t bytesIn = 0;
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esp_err_t result = i2s_read(I2S_PORT, &sBuffer, bufferLen, &bytesIn, portMAX_DELAY);
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if (result == ESP_OK)
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{
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// Read I2S data buffer
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int16_t samples_read = bytesIn / 8;
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if (samples_read > 0)
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{
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float mean = 0;
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for (int16_t i = 0; i < samples_read; ++i)
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{
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mean += (sBuffer[i]);
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}
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// Average the data reading
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mean /= samples_read;
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// Print to serial plotter
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Serial.println(mean);
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int recu = bytesIn / sizeof(int32_t);
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for (int i = 0; i < recu; i++)
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{
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Serial.printf("%ld\n", sBuffer[i]);
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}
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// Serial.print(" - ");
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Serial.println(bytesIn);
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}
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}
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}
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