FridgeSensor/main/sound.c

#include "sound.h"
#include <stdio.h>
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "driver/gpio.h"
#include "esp_log.h"
#include "sdkconfig.h"
#include "driver/ledc.h"

#define PWM_PIN       GPIO_NUM_19       // GPIO pin for PWM output
#define PWM_FREQ      262               // Frequency for C4 (Middle C)
#define PWM_CHANNEL   LEDC_CHANNEL_0
#define PWM_TIMER     LEDC_TIMER_0
#define PWM_RES       LEDC_TIMER_8_BIT  // 8-bit resolution (0-255)

static void setupSound() {

    // Configure LEDC PWM Timer
    ledc_timer_config_t timer_conf = {
        .speed_mode = LEDC_LOW_SPEED_MODE,
        .duty_resolution = PWM_RES,
        .timer_num  = PWM_TIMER,
        .freq_hz    = PWM_FREQ,
        .clk_cfg    = LEDC_AUTO_CLK,
    };
    ledc_timer_config(&timer_conf);

    // Configure LEDC PWM Channel
    ledc_channel_config_t channel_conf = {
        .gpio_num   = PWM_PIN,
        .speed_mode = LEDC_LOW_SPEED_MODE,
        .channel    = PWM_CHANNEL,
        .timer_sel  = PWM_TIMER,
        .duty       = 0,  // Start at 0% volume
    };
    ledc_channel_config(&channel_conf);

    ESP_LOGI("SOUND", "Sound setup");
}

static void sound_task(void *pvParameters) {

    setupSound();

    while (1) {

        ledc_set_duty(LEDC_LOW_SPEED_MODE, PWM_CHANNEL, 30);
        ledc_update_duty(LEDC_LOW_SPEED_MODE, PWM_CHANNEL);

        /*// Gradually increase volume (fade-in)
        for (int duty = 10; duty <= 127; duty += 5) {
            ledc_set_duty(LEDC_LOW_SPEED_MODE, PWM_CHANNEL, duty);
            ledc_update_duty(LEDC_LOW_SPEED_MODE, PWM_CHANNEL);
            vTaskDelay(pdMS_TO_TICKS(50));
        }*/

        vTaskDelay(pdMS_TO_TICKS(1000));  // Keep sound for 500ms

        ledc_set_duty(LEDC_LOW_SPEED_MODE, PWM_CHANNEL, 10);
        ledc_update_duty(LEDC_LOW_SPEED_MODE, PWM_CHANNEL);

        /*// Gradually decrease volume (fade-out)
        for (int duty = 127; duty >= 0; duty -= 5) {
            ledc_set_duty(LEDC_LOW_SPEED_MODE, PWM_CHANNEL, duty);
            ledc_update_duty(LEDC_LOW_SPEED_MODE, PWM_CHANNEL);
            vTaskDelay(pdMS_TO_TICKS(50));
        }*/


        vTaskDelay(pdMS_TO_TICKS(1000)); // Delay 1 second
    }

    ESP_LOGI("SOUND", "Sound task starts....");
}

void initSound() {

    xTaskCreate(sound_task, "sound_task", 2048, NULL, 10, NULL);
    ESP_LOGI("SOUND", "Sound initialized");
}