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const int fan =  12;      
int fanState = LOW;             
unsigned long previousMillis = 0;        
const long interval = 60000;           

void setup() {
   pinMode(fan, OUTPUT);
}

void loop() {
  
  unsigned long currentMillis = millis();
  if (currentMillis  >= interval) {
   
      fanState = HIGH;
    } else {
      fanState = LOW;
    }
    digitalWrite(fan, fanState);
  }

const int ledPin =  11;

unsigned long desiredBeginDelay = 5000; //trigger's interval
unsigned long desiredEndDelay = 5000; //trigger's interval
unsigned long signalBeginTime = 0;   //0 - stop, millis() - begin interval
unsigned long signalEndTime = 0;   //0 - stop, millis() - begin interval

bool isTriggerTime(unsigned long beginTime, unsigned long interval) {
	bool result = false;

	if(beginTime > 0)
		result = (millis() - beginTime) >= interval;

	return result;
}

void setup() {
	pinMode(ledPin, OUTPUT);
	digitalWrite(ledPin, LOW);
	
	delay(10); //set internal time > 10
	signalBeginTime = millis(); //start trigger at current time
}

void loop() {
	if(isTriggerTime(signalBeginTime, desiredBeginDelay)){
		digitalWrite(ledPin, HIGH);
		signalEndTime = millis();
		signalBeginTime = 0;
	}

	if(isTriggerTime(signalEndTime, desiredEndDelay)){
		digitalWrite(ledPin, LOW);
		signalEndTime = 0;
	}
}

const int ledPin =  11;     
const int desireDelay = 5000;

void setup() {
  // initialize the LED pin as an output:
  pinMode(ledPin, OUTPUT);
   digitalWrite(ledPin, LOW);
   delay(desireDelay);
   digitalWrite(ledPin, HIGH);
}


void loop() { }