<C++> #define uS_TO_S_FACTOR 1000000 #define TIME_TO_SLEEP 10

RTC_DATA_ATTR int bootCount = 0;

void print_wakeup_reason(){

esp_sleep_wakeup_cause_t wakeup_reason;

wakeup_reason = esp_sleep_get_wakeup_cause();

switch(wakeup_reason)
{
  case ESP_SLEEP_WAKEUP_EXT0 : Serial.println("PUSHED BUTTON caused the system to WAKEUP"); break;
  case ESP_SLEEP_WAKEUP_TIMER : Serial.println("TIMER caused the system to WAKEUP"); break;
  default : Serial.printf("DeepSleep didn't wake up ESP32: %d\n",wakeup_reason); break;
}

}

void setup(){

Serial.begin(115200);
delay(1000); 

pinMode(32,OUTPUT);         

pinMode(33,INPUT_PULLUP);  

for(int i=0;i<5;i++)

{

digitalWrite(32,HIGH);  
delay(1000);
digitalWrite(32,LOW);
delay(1000);
}

++bootCount;

Serial.println("Reboot count number: " + String(bootCount));

print_wakeup_reason();

esp_sleep_enable_ext0_wakeup(GPIO_NUM_33,0);

esp_sleep_enable_timer_wakeup(TIME_TO_SLEEP * uS_TO_S_FACTOR);

Serial.println(“ESP32 is going into DeepSleep for ” + String(TIME_TO_SLEEP) +

" Seconds");

Serial.println("Going to sleep now......");
delay(1000);
Serial.flush(); 
esp_deep_sleep_start();

}

</C++>