As soon as I add Serial.begin(115200); in my project i get a bunch of build errors (see below). Without that line everything works as it should. Other Arduino functions work fine. In an empty project just for testing Arduino Serial printing it also works without a problem. Tried to solve it with ...

I also tried a variant without Arduino. So pure ESP-IDF. This is the code:


#include <stdio.h>
#include "esp_timer.h"
#include "esp_sleep.h"

void app_main(void)
{
printf("\n");
printf("Time since boot: %lld us\n", esp_timer_get_time());

esp_sleep_enable_timer_wakeup(10 * 1000000);
esp_deep ...

I have a project where I use a custom designed PCB with the ESP32-S2-Solo module to get some sensor data and send them via ESP-NOW. Everything is battery powered and therefore I aim for the lowest power consumption possible.
The situation now: Everything is working but the boot time of the ESP32-S2 ...