Implement INMP441 noise indicator with RGB LED feedback and update project configuration
This commit is contained in:
+2
-1
@@ -1,2 +1,3 @@
|
||||
idf_component_register(SRCS "main.c"
|
||||
INCLUDE_DIRS ".")
|
||||
INCLUDE_DIRS "."
|
||||
REQUIRES esp_driver_gpio esp_driver_i2s led_strip)
|
||||
|
||||
@@ -1,49 +0,0 @@
|
||||
menu "Example Configuration"
|
||||
|
||||
orsource "$IDF_PATH/examples/common_components/env_caps/$IDF_TARGET/Kconfig.env_caps"
|
||||
|
||||
choice BLINK_LED
|
||||
prompt "Blink LED type"
|
||||
default BLINK_LED_GPIO
|
||||
help
|
||||
Select the LED type. A normal level controlled LED or an addressable LED strip.
|
||||
The default selection is based on the Espressif DevKit boards.
|
||||
You can change the default selection according to your board.
|
||||
|
||||
config BLINK_LED_GPIO
|
||||
bool "GPIO"
|
||||
config BLINK_LED_STRIP
|
||||
bool "LED strip"
|
||||
endchoice
|
||||
|
||||
choice BLINK_LED_STRIP_BACKEND
|
||||
depends on BLINK_LED_STRIP
|
||||
prompt "LED strip backend peripheral"
|
||||
default BLINK_LED_STRIP_BACKEND_RMT if SOC_RMT_SUPPORTED
|
||||
default BLINK_LED_STRIP_BACKEND_SPI
|
||||
help
|
||||
Select the backend peripheral to drive the LED strip.
|
||||
|
||||
config BLINK_LED_STRIP_BACKEND_RMT
|
||||
depends on SOC_RMT_SUPPORTED
|
||||
bool "RMT"
|
||||
config BLINK_LED_STRIP_BACKEND_SPI
|
||||
bool "SPI"
|
||||
endchoice
|
||||
|
||||
config BLINK_GPIO
|
||||
int "Blink GPIO number"
|
||||
range ENV_GPIO_RANGE_MIN ENV_GPIO_OUT_RANGE_MAX
|
||||
default 8
|
||||
help
|
||||
GPIO number (IOxx) to blink on and off the LED.
|
||||
Some GPIOs are used for other purposes (flash connections, etc.) and cannot be used to blink.
|
||||
|
||||
config BLINK_PERIOD
|
||||
int "Blink period in ms"
|
||||
range 10 3600000
|
||||
default 1000
|
||||
help
|
||||
Define the blinking period in milliseconds.
|
||||
|
||||
endmenu
|
||||
+132
-6
@@ -1,13 +1,139 @@
|
||||
#include <stdio.h>
|
||||
#include "freertos/FreeRTOS.h"
|
||||
#include "freertos/task.h"
|
||||
#include <math.h>
|
||||
#include <stdint.h>
|
||||
|
||||
#include "driver/gpio.h"
|
||||
#include "driver/i2s_std.h"
|
||||
#include "esp_err.h"
|
||||
#include "esp_log.h"
|
||||
#include "freertos/FreeRTOS.h"
|
||||
#include "led_strip.h"
|
||||
#include "sdkconfig.h"
|
||||
|
||||
#define I2S_BCLK_GPIO GPIO_NUM_3
|
||||
#define I2S_WS_GPIO GPIO_NUM_4
|
||||
#define I2S_DATA_GPIO GPIO_NUM_5
|
||||
#define RGB_LED_GPIO GPIO_NUM_48
|
||||
|
||||
#define SAMPLE_RATE_HZ 16000
|
||||
#define SAMPLES_PER_READ 256
|
||||
#define GREEN_NOISE_RMS 100000.0f
|
||||
#define RED_NOISE_RMS 1000000.0f
|
||||
#define LED_BRIGHTNESS 64
|
||||
|
||||
static const char *TAG = "buzz_detector";
|
||||
|
||||
void app_main(void) {
|
||||
println("Hello, ESP32!");
|
||||
static led_strip_handle_t init_rgb_led(void)
|
||||
{
|
||||
const led_strip_config_t strip_config = {
|
||||
.strip_gpio_num = RGB_LED_GPIO,
|
||||
.max_leds = 1,
|
||||
.led_model = LED_MODEL_WS2812,
|
||||
.color_component_format = LED_STRIP_COLOR_COMPONENT_FMT_GRB,
|
||||
.flags = {
|
||||
.invert_out = false,
|
||||
},
|
||||
};
|
||||
const led_strip_rmt_config_t rmt_config = {
|
||||
.clk_src = RMT_CLK_SRC_DEFAULT,
|
||||
.resolution_hz = 10 * 1000 * 1000,
|
||||
.mem_block_symbols = 64,
|
||||
.flags = {
|
||||
.with_dma = false,
|
||||
},
|
||||
};
|
||||
|
||||
led_strip_handle_t strip = NULL;
|
||||
ESP_ERROR_CHECK(led_strip_new_rmt_device(&strip_config, &rmt_config, &strip));
|
||||
ESP_ERROR_CHECK(led_strip_clear(strip));
|
||||
return strip;
|
||||
}
|
||||
|
||||
static void update_rgb_led(led_strip_handle_t strip, float rms)
|
||||
{
|
||||
float red = 0.0f;
|
||||
float green = 0.0f;
|
||||
|
||||
if (rms < GREEN_NOISE_RMS) {
|
||||
green = LED_BRIGHTNESS * rms / GREEN_NOISE_RMS;
|
||||
} else {
|
||||
float red_fraction = (rms - GREEN_NOISE_RMS) /
|
||||
(RED_NOISE_RMS - GREEN_NOISE_RMS);
|
||||
if (red_fraction > 1.0f) {
|
||||
red_fraction = 1.0f;
|
||||
}
|
||||
red = LED_BRIGHTNESS * red_fraction;
|
||||
green = LED_BRIGHTNESS * (1.0f - red_fraction);
|
||||
}
|
||||
|
||||
ESP_ERROR_CHECK(led_strip_set_pixel(strip, 0, (uint8_t)red,
|
||||
(uint8_t)green, 0));
|
||||
ESP_ERROR_CHECK(led_strip_refresh(strip));
|
||||
}
|
||||
|
||||
static i2s_chan_handle_t init_microphone(void)
|
||||
{
|
||||
i2s_chan_handle_t rx_channel = NULL;
|
||||
const i2s_chan_config_t channel_config =
|
||||
I2S_CHANNEL_DEFAULT_CONFIG(I2S_NUM_0, I2S_ROLE_MASTER);
|
||||
ESP_ERROR_CHECK(i2s_new_channel(&channel_config, NULL, &rx_channel));
|
||||
|
||||
i2s_std_config_t standard_config = {
|
||||
.clk_cfg = I2S_STD_CLK_DEFAULT_CONFIG(SAMPLE_RATE_HZ),
|
||||
.slot_cfg = I2S_STD_PHILIPS_SLOT_DEFAULT_CONFIG(
|
||||
I2S_DATA_BIT_WIDTH_32BIT, I2S_SLOT_MODE_MONO),
|
||||
.gpio_cfg = {
|
||||
.mclk = I2S_GPIO_UNUSED,
|
||||
.bclk = I2S_BCLK_GPIO,
|
||||
.ws = I2S_WS_GPIO,
|
||||
.dout = I2S_GPIO_UNUSED,
|
||||
.din = I2S_DATA_GPIO,
|
||||
.invert_flags = {
|
||||
.mclk_inv = false,
|
||||
.bclk_inv = false,
|
||||
.ws_inv = false,
|
||||
},
|
||||
},
|
||||
};
|
||||
standard_config.slot_cfg.slot_mask = I2S_STD_SLOT_LEFT;
|
||||
|
||||
ESP_ERROR_CHECK(i2s_channel_init_std_mode(rx_channel, &standard_config));
|
||||
ESP_ERROR_CHECK(i2s_channel_enable(rx_channel));
|
||||
return rx_channel;
|
||||
}
|
||||
|
||||
void app_main(void)
|
||||
{
|
||||
led_strip_handle_t rgb_led = init_rgb_led();
|
||||
i2s_chan_handle_t microphone = init_microphone();
|
||||
int32_t samples[SAMPLES_PER_READ];
|
||||
float smoothed_rms = 0.0f;
|
||||
uint32_t log_counter = 0;
|
||||
|
||||
ESP_LOGI(TAG, "INMP441 ready on BCLK=%d, WS=%d, SD=%d; RGB LED on GPIO %d",
|
||||
I2S_BCLK_GPIO, I2S_WS_GPIO, I2S_DATA_GPIO, RGB_LED_GPIO);
|
||||
|
||||
while (true) {
|
||||
size_t bytes_read = 0;
|
||||
ESP_ERROR_CHECK(i2s_channel_read(microphone, samples, sizeof(samples),
|
||||
&bytes_read, portMAX_DELAY));
|
||||
const size_t sample_count = bytes_read / sizeof(samples[0]);
|
||||
if (sample_count == 0) {
|
||||
continue;
|
||||
}
|
||||
|
||||
int64_t sum_squares = 0;
|
||||
for (size_t i = 0; i < sample_count; ++i) {
|
||||
// INMP441 provides 24-bit signed samples in the upper bits of each 32-bit slot.
|
||||
const int32_t sample = samples[i] >> 8;
|
||||
sum_squares += (int64_t)sample * sample;
|
||||
}
|
||||
|
||||
const float rms = sqrtf((float)sum_squares / sample_count);
|
||||
smoothed_rms += 0.2f * (rms - smoothed_rms);
|
||||
update_rgb_led(rgb_led, smoothed_rms);
|
||||
|
||||
if (++log_counter == 16) {
|
||||
ESP_LOGI(TAG, "sound RMS: %.0f", smoothed_rms);
|
||||
log_counter = 0;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
Reference in New Issue
Block a user