#include <stdio.h>
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "driver/ledc.h"
#define BUZZER_0 19
#define BUZZER_1 18
#define BUZZER_2 17
#define BUZZER_3 16
void app_main() {
printf("\napp_main()\n\n");
ledc_set_pin(BUZZER_0, LEDC_HIGH_SPEED_MODE, LEDC_CHANNEL_0);
ledc_set_freq(LEDC_HIGH_SPEED_MODE, LEDC_TIMER_0, 440);
vTaskDelay(pdMS_TO_TICKS(500));
ledc_stop(LEDC_HIGH_SPEED_MODE, LEDC_CHANNEL_0, 0);
vTaskDelete(NULL);
}