const int izlaz = 9;
  const int ulaz = A0;

void setup() {
  pinMode(izlaz, OUTPUT);
  pinMode(ulaz, INPUT);
  digitalWrite(ulaz, HIGH);
}

void loop() {
  if (digitalRead(ulaz) == LOW) {
      digitalWrite(izlaz, HIGH);
      delay(20000);
      digitalWrite(izlaz, LOW);
      delay(15000);
      digitalWrite(izlaz, HIGH);
      delay(20000);
      digitalWrite(izlaz, LOW);
      delay(15000);
      digitalWrite(izlaz, HIGH);
      delay(20000);
  }
  else {
    digitalWrite(izlaz, LOW);
  }
}





/*

void loop() {
// put your main code here, to run repeatedly:
  if (millis() < sekundi * 1) {
  digitalWrite(izlaz, HIGH);
 delay(1000);
  digitalWrite(izlaz, LOW);
  delay(1000);
   //do this for 15mins from start up
  } else { //15 minutes is up
    //turn stuff off
  }
}*/





/*
void loop() {
  // put your main code here, to run repeatedly:
  int ocitanje = analogRead(ulaz);
  digitalWrite(izlaz, ocitanje);
 
 
 
  if (millis() < sekundi * 1) {
  digitalWrite(izlaz, HIGH);
  delay(1000);
  digitalWrite(izlaz, LOW);
  delay(1000);
    //do this for 15mins from start up
  } else { //15 minutes is up
    //turn stuff off
  }
}
*/











/*
void loop() {
// put your main code here, to run repeatedly:
  if (millis() < sekundi * 1) {
  digitalWrite(izlaz, HIGH);
 delay(1000);
  digitalWrite(izlaz, LOW);
  delay(1000);
   //do this for 15mins from start up
  } else { //15 minutes is up
    //turn stuff off
  }
}
*/