#define LED_PIN     2 // ESP32 pin GPIO18 connected to LED

unsigned long previousMillis = 0;

unsigned ledLong = 0;
unsigned dhtLong = 0;
int lightCount = 0;

void setup() {
  pinMode(LED_PIN,OUTPUT);
  digitalWrite(LED_PIN, LOW); //off

  Serial.begin(115200);
  Serial.println("Setup");
}

void sosLed(unsigned long currentMillis) {
  //               0  1 2  3 4  5 6 7 8 9 10 11 
  byte counts[] = {1, 1,1, 1,1, 1,1,2,1,2, 1, 2,};
  if(lightCount > 11) {
    lightCount = 0;
  }

  // Serial.println(lightCount);

  if(ledLong >= counts[lightCount]) {
    digitalWrite(LED_PIN, !digitalRead(LED_PIN));
    ledLong = 0;
    lightCount = lightCount + 1;  
  } else {
    ledLong = ledLong + currentMillis - previousMillis;
  }
}

void readDht(unsigned long currentMillis) {
  if(dhtLong >= 19) {    
    dhtLong = 0;
    Serial.print(currentMillis);        
    Serial.print(" DHT call");
    Serial.println("");
  } else {
    dhtLong = dhtLong + currentMillis - previousMillis;
    Serial.println(dhtLong);
  }
}

void loop() {
  unsigned long currentMillis = (millis()/100);
  if (currentMillis - previousMillis >= 1) {
    // 
    sosLed(currentMillis);
    // readDht(currentMillis);
    // 
    previousMillis = currentMillis;  
  }
}