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#define BUZZER_TIMER    (LEDC_TIMER_1)
#define BUZZER_CHANNEL  (LEDC_CHANNEL_1)
#define BUZZER_GPIO_NBR      (GPIO_NUM_5)
#define BUZZER_GPIO_PIN      (GPIO_SEL_5)
#define BUZZER_FREQ     (2670)

#define BUZZER_TIMER_RESOLUTION (LEDC_TIMER_10_BIT)

#define BUZZER_MAX_DUTY ((1 << (BUZZER_TIMER_RESOLUTION)) - 1)
// set the "on" duty (volume) to 1/2 the max.
#define BUZZER_ON_DUTY (BUZZER_MAX_DUTY / 2)
#define BUZZER_OFF_DUTY (0)

#define BUZZER_QUEUE_TIMEOUT (10) // ticks; = .1 second.


const ledc_timer_config_t buzzer_timer =
{
    LEDC_HIGH_SPEED_MODE,
    {BUZZER_TIMER_RESOLUTION},
    BUZZER_TIMER,
    BUZZER_FREQ
};

const ledc_channel_config_t buzzer_channel =
{
    BUZZER_GPIO_NBR,
    LEDC_HIGH_SPEED_MODE,
    BUZZER_CHANNEL,
    LEDC_INTR_DISABLE,
    BUZZER_TIMER,
    0,
    LEDC_HPOINT_HSCH0
};

void Buzzer::setDuty(uint32_t duty)
{
    ESP_ERROR_CHECK(ledc_set_duty(LEDC_HIGH_SPEED_MODE, BUZZER_CHANNEL, duty));
    ESP_ERROR_CHECK(ledc_update_duty(LEDC_HIGH_SPEED_MODE, BUZZER_CHANNEL));
    ESP_LOGI(TAG, "buzzer duty set to %d.", ledc_get_duty(LEDC_HIGH_SPEED_MODE, BUZZER_CHANNEL));
}

...

        for (unsigned int i = BUZZER_ON_DUTY; i < BUZZER_MAX_DUTY; i += 10)
        {
            setDuty(i);
            vTaskDelay(10);
        }