Turning on the LED after a while.

Hi Sofiia,

To do this properly is quite an advanced thing. There's a capability inside the Arduino (it is slightly different depending on which Arduino you are using, but at a high level, the concept is the same) called a timer. The timer can be programmed to generate something called an 'interrupt' which calls a special function (called an interrupt service routine) regularly, for example every second.

Then, you can use a global variable to count these 1-second ticks. Another global variable can be used to store state information related to (say) button press.

Button-presses need debouncing, that is another topic too,

To make a long story short, these two topics will require a lot of reading.

Some resources are here:

Timers and interrupts: https://learn.adafruit.com/multi-tasking-the-arduino-part-2/timers

Button debounce: https://blog.adafruit.com/2009/10/20/example-code-for-multi-button-checker-with-debouncing/

Hi Sofiia,

If you do not need to use an arduino I believe a dedicated circuit using two 555 timers and a flip flop will be able to produce this effect.

John

I made sketches, look, please. I need to add time, but I'm already confused with the millis () function. Correct, if there's a mistake.

class PauseFlasher
{
  const unsigned long maxValue = 4294967295UL; // maximum counter value

  int ledPin; 
  long OnTime; 
  long OffTime; 
  long PeriodFlashing; 
  long PeriodPause; 

  int ledState; 
  int ledFlashing; 
  int keyState, oldKeyState; 
  unsigned long previousMillis;
  unsigned long previousFlashingMillis; 
  unsigned long previousKeyMillis;

  public:
  PauseFlasher(int pin, long on, long off, long flashing, long pause)
  {
   ledPin = pin;
   pinMode(ledPin, OUTPUT);

   OnTime = on;
   OffTime = off;
   PeriodFlashing = flashing;
   PeriodPause = pause;

   ledState = HIGH;
   ledFlashing = HIGH;
   keyState = LOW;
   oldKeyState = HIGH;
   previousMillis = 0; 
   previousFlashingMillis = 0; 
   previousKeyMillis = 0;
  }

  void Update()
  {
    unsigned long currentMillis = millis(); 
    unsigned long temp_time=0, temp_time1=0;

    if (currentMillis >= previousFlashingMillis) temp_time1 = currentMillis - previousFlashingMillis;
    else temp_time1 = maxValue - previousFlashingMillis + currentMillis;

    if ((ledFlashing==HIGH) && (temp_time1 >= PeriodFlashing))
    {
      ledFlashing = LOW; 
      previousFlashingMillis = currentMillis; 
      digitalWrite(ledPin, ledFlashing); 
      keyState = LOW;
      oldKeyState= HIGH;
    }
    if ((ledFlashing==LOW) && (temp_time1 >= PeriodPause))
    {
      ledFlashing = HIGH; 
      previousFlashingMillis = currentMillis ; 
      digitalWrite(ledPin, ledFlashing); 
      keyState = LOW;
      oldKeyState= HIGH;
    }

    if(ledFlashing==HIGH)
    {
      if (currentMillis >= previousMillis) temp_time = currentMillis - previousMillis;
      else temp_time = maxValue  - previousMillis + currentMillis;
      
      if((ledState == HIGH) && (temp_time >= OnTime))
      {
        ledState = LOW; // выключаем
        previousMillis = currentMillis; 
        digitalWrite(ledPin, ledState); 
      }
      else if ((ledState == LOW) && (temp_time >= OffTime))
      {
        ledState = HIGH; // включаем
        previousMillis = currentMillis ; 
        digitalWrite(ledPin, ledState); 
      }
    }
    if(ledFlashing==LOW)
    {
      if (digitalRead(2)==HIGH)
      {
        if(millis()-previousKeyMillis>100)
        {
          previousKeyMillis = millis();
          if(keyState==oldKeyState)
          {
            if(keyState==LOW) keyState=HIGH;
            else if(keyState==HIGH) keyState=LOW;
            digitalWrite(ledPin, keyState);
          }  
        }
      }
      else oldKeyState=keyState;
    }
  }
};

PauseFlasher led1(13, 100, 200, 5000, 15000);

void setup(){}

void loop()
{
  led1.Update();
}

Do you have an option on how to do this? For example, a circuit?

Hi Sofiia,

The code is hard to follow, possibly line 54 might need changing from "if" to "else if" but I'm only guessing, I could only partially understand the code.

You can use Serial.println to print out debug to try to get an idea where the code executes, and the values of variables to debug this, so that you can be sure that the values in the variables are what you expect.

Thanks. It remains to understand where to write what numbers (which I need), otherwise I’m already confused. Can you help me please?

For simplicity, you can replace your button with 'push on-off' or add an another 'tact switch' for the same. This will make your code routine much easier.

Remember things that can't be reached with just CODE, can be easily done out with a little tweak in HARDWARE.

Do you mean that I need to add another button? Then how to write this in code?

Through a simple push On-Off button, the Arduino can read the State-change detection, hence the timing sequence can be allocated to desired state.

And if you try like this? Only produces an error: a function-definition is not allowed here before '{' token

int G_LedPin = 13;             
int ButPin = 10;               
int flag = 0;                
int regim = 0;                 

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

void loop()
{
  if(digitalRead(ButPin) == HIGH && flag == 0)      
    {                                              
      regim ++;
      flag = 1;
      
      if(regim > 1) 
        {            
          regim = 0;
        }
    }
  
  if(digitalRead(ButPin) == LOW && flag == 1)
    {
      flag = 0;
    }  
    
// ======= Perform the task when choosing a mode =======
// REGIM 0: OFF
  if(regim == 0)
    {
      digitalWrite(G_LedPin, LOW);     
    }
    
// REGIM 1: G
  if(regim == 1)
    {
      digitalWrite(G_LedPin, HIGH);    
    }
    void loop() {
digitalWrite(G_LedPin, HIGH); 
delay(10000); 
digitalWrite(G_LedPin, LOW); 
delay(300000);
}   
}