Deep Sleep Mode

#include "esp_sleep.h"
#include "driver/rtc_io.h"

#define uS_TO_S_FACTOR 1000000  // Conversion factor for micro seconds to seconds
#define TIME_TO_SLEEP 10        // Time ESP32 will sleep (in seconds)

void setup() {
    Serial.begin(115200);
    delay(1000);

    Serial.println("Going to sleep now...");
    esp_sleep_enable_timer_wakeup(TIME_TO_SLEEP * uS_TO_S_FACTOR);
    esp_deep_sleep_start();
}

void loop() {
    // This will never be reached
}