test_lolin32.ino

#include <esp_wifi.h>

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

//const int PIN_LED = 22; // LOLIN32 lite
const int PIN_LED = 5;  // LOLIN32

void setup()
{
  pinMode(PIN_LED, OUTPUT);
  digitalWrite(PIN_LED, LOW);
}

void loop()
{
  delay(TIME_TO_SLEEP * 1000);

  esp_wifi_deinit();
  esp_sleep_enable_timer_wakeup(TIME_TO_SLEEP * uS_TO_S_FACTOR);
  esp_deep_sleep_start();
}