If statement excution after sometime

[sarah_20]

I want to make if condition with 2 conditions one of them will be a time condition ; ex:
if the 1st condition is right and the time elapsed is 5000 ms then do something
(excute the if statement )
how can i make this

[kangaroodle]

You can "and" the conditions in one if:

if ( condition1 AND condition2)
{
  // do things
}

Or you can nest 2 statements:

if (condition1)
{
   if (condition2)
  {
     // do things
  }
}

[DVDdoug]

Do you know how to get the elapsed time with millis()? ...Basically you "capture" the starting millis() time as a variable, then when you want to check, read millis() again and subtract. (millis() uses type unsigned long.)

You can include logical and (&&) in your if statement...

If (A && B && CC) and if you want you can include the subtraction & comparison to inside the if-statement, and you can even read current millis() time inside the if-statement. Or you can do some of that stuff right-before the if-statement if that's easier for you.

It's also possible to make nested if-statements so the second one gets skipped-over if it's not time yet.

(Normally it's best to keep it all on one line if you can, and if it's not too confusing... to humans. )

[ToddL1962]

@sarah_20

I want to make if condition with 2 conditions one of them will be a time condition ; ex:
if the 1st condition is right and the time elapsed is 5000 ms then do something

This tutorial illustrates how to use millis() to perform a timed operation:

BlinkWithoutDelay

[StefanL38]

@ToddL1962

This tutorial illustrates how to use millis() to perform a timed operation:

BlinkWithoutDelay

IMHO this tutorial is pretty hard to understand. At least harder than this one:

Example-code for timing based on millis() easier to understand through the use of example-numbers / avoiding delay()

non-blocking timing. Execute code only from time to time. There are a lot of different ways to learn programming. This thread wants to add another approach that is different to the yet existing ones. UPDATE 06.01.2023 if you are mainly interested in applying non-blocking timing you can do a quick read of this short tutorial / demonstration If you are intersted in understanding the details how it works go on reading here. I use an everyday analogon in this post to explain the basic principle …

best regards Stefan

[ToddL1962]

Thanks @StefanL38. I like that. I will start recommending that tutorial instead.

[obyilmaz]

do u thing adding millis function? i always use it.

[StefanL38]

millis işlevi ekleyen bir şey var mı? her zaman kullanırım.

[sarah_20]

this is the code i want but id don't know how to start counting time after a certain condition is true

if (button1==HIGH && button2==HIGH)
{
// start counting time 
}
if (// counted time == 5000 )
{
digitalWrite(led,high);
}

[sarah_20]

this is the code i want but id don't know how to start counting time after a certain condition is true

if (button1==HIGH && button2==HIGH)
{
// start counting time 
}
if (// counted time == 5000 )
{
digitalWrite(led,high);
}

[/quote]

[paulpaulson]

Hello sarah_20
Post your current sketch, well formated, with comments and in so called code tags "</>" to see how we can help.
Have a nice day and enjoy coding in C++.
Дайте миру шанс!

[kangaroodle]

Try something like this...

disclaimer... 100% untested

//right at the top above setup
bool weAreTiming = false;
unsigned long startTime;


if (button1==HIGH && button2==HIGH) // HIGH is pressed?
{
   if (!weAreTiming)  //! means "not" so read as "if we are not timing"
   {
       startTime = millis(); //start the clock
       weAreTiming = true; // but now we ARE timing so don't reset the timer next time round
   }
}

if (weAreTiming && millis()-startTime >= 5000 )  //note >= rather than == which might miss the exact slot
{
digitalWrite(led,HIGH);  //note HIGH not high as you had
}

if (button1==LOW || button2==LOW) // || is "or" ... either or both buttons are now released
weAreTiming=false; // ready for the next time both are seen to be pressed

[DaveX]

@sarah_20

if the 1st condition is right and the time elapsed is 5000 ms then do something
(excute the if statement )
how can i make this

The trick is capturing the time of the event that starts the timer. One possibility is:

if (! firstCondition) {
   lastNotFirstConditionTime = millis();
}
...

if (firstCondition && millis() - lastNotFirstCondtionTime >= 5000){
  doSomething();
}

Another is to set a flag to monitor something:

bool isHappening = false;
...
if(!firstCondition){
  isHappening = false;
}

if (!isHappening && firstCondition){
  isHappening = true;
  tStart = millis();
}

if (isHappening && millis() - tStart) {
  doSomething();
  ...
}

[alto777]

@DaveX

lastNotFirstConditionTime = millis();

LOL.

Sry, this variable name just does. Make me. LOL.

a7

[DaveX]

@alto777

LOL

Aw, I worked hard at that. ;)