int LED = 13;
const unsigned long DELAY_TIME = 10000;
const unsigned long DELAY_TIME1 = 2000;

unsigned long moisture_timer, moisture_on;

void setup() {
  Serial.begin(9600);

  for (int i = 5; i > 0; i--) { // just to give a little time before it all starts
    delay(1000);
    Serial.print(i); Serial.print(' ');

  }
  Serial.println();

  pinMode(LED, OUTPUT);
  digitalWrite(LED, LOW);

  moisture_timer =  moisture_on = millis();

}

void loop() {

  if (millis()-moisture_timer> DELAY_TIME) {
    if(digitalRead(LED)==LOW){
      moisture_on = millis(); 
    }
    digitalWrite(LED, HIGH);

    if (millis()-moisture_on> DELAY_TIME1) {
      digitalWrite(LED, LOW);
      moisture_timer = millis();
    }
  }
  
}