auto delayOn(const uint32_t, bool) -> bool;

uint32_t mTimestamp = 0; 

void setup() {
  Serial.begin(9600);
  pinMode(2, INPUT);
  pinMode(3, OUTPUT);
}

void loop() {
  auto btn = digitalRead(2);
  auto delayTriggered = delayOn(3000, btn);

  if(delayTriggered)
  {
    digitalWrite(3, HIGH);
    //Serial.println("Turned on after" + String(millis()));
  }
  else
    digitalWrite(3, LOW);

  
}

/**
 * @brief
 *
 * @param targetTime
 * @param reset
 * @return true
 * @return false
 */
auto delayOn(const uint32_t targetTime, const bool active) -> bool
{
   if(!active)
   {
    mTimestamp = millis();
    return false;
   }

   uint32_t millisTemp = millis() - mTimestamp;
    if (millisTemp >= targetTime)
    {
      return true;
    }else 
      return false; 
}