Arduino

[JWKelly99]

Hi,

 

In Arduino how do you get an 'if' statement to recheck the original value between each of the following 'else' statements?

 

So, for example,

 

if (distance =10) {

 

do task 'a';

 

}

 

else{

 

complete task 'b';

complete task 'c';

complete task 'd';

 

}

 

How would I get it to recheck the distance between each of the tasks in the 'else' section?

 

Thanks

[MrDrWho13]

You would need an if statement every time you want to check it.

 

Also remember to put "==" not "=" since they mean different things.

[vorticalbox]

13 minutes ago, MrDrWho13 said:

You would need an if statement every time you want to check it.

 

Also remember to put "==" not "=" since they mean different things.

Putting all the ifs is a lot of repeated code and probably deserves some more design.

[MrDrWho13]

Just now, vorticalbox said:

Putting all the ifs is a lot of repeated code and probably deserves some more design.

That's true

@JWKelly99 Why do you want to check at each point? Are you putting delays in your code? Can't you just run them all and check next time?

 

[JWKelly99]

17 minutes ago, MrDrWho13 said:

That's true

@JWKelly99 Why do you want to check at each point? Are you putting delays in your code? Can't you just run them all and check next time?

 

Want it to recheck the distance between each of the tasks in the 'else'

[Unimportant]

13 hours ago, JWKelly99 said:

Hi,

 

In Arduino how do you get an 'if' statement to recheck the original value between each of the following 'else' statements?

 

So, for example,

 

if (distance =10) {

 

do task 'a';

 

}

 

else{

 

complete task 'b';

complete task 'c';

complete task 'd';

 

}

 

How would I get it to recheck the distance between each of the tasks in the 'else' section?

 

Thanks

The most obvious way would be with a switch statement:

switch (distance)
{
  case 10:  /* Handle distance == 10 */ break;
  case 20:  /* Handle distance == 20 */ break;
  //Etc...
  default:  /* Handle anything else */  break; 
}

 

[Guest]

Put it in the loop function so when it comes back around it rechecks it. 

 

 

Edit

 

or use a while loop 

[straight_stewie]

19 hours ago, JWKelly99 said:

Want it to recheck the distance between each of the tasks in the 'else'

I'm struggling to understand what you want to do.

Do you want to execute one, and only one of your statements?
Do you want to execute possibly many of your statements?
Do you want to execute either the if, or the else, and just need to update the value of distance between the else statements?

For the first case, I'm not sure a switch statement works. Case (switch) statements only work if your variable should only be one of a few values. In the first case you should do:

if (condition)
{
	//Do stuff
}

else if (other condition)
{
  // Do stuff
}

else if (yet another condition)
{
  // Do stuff
}

 

For the second statement:

if (condition)
{
  // Do stuff
}

if (other condition)
{
  // Do stuff
}

if (yet another condition)
{
  // Do stuff
}

 

For the third statement (I think this is what you want??):

if (condition)
{
  // Do stuff
}

else
{
  // Do stuff
  update variable;
  // do stuff
  update variable;
  // do stuff
}

That would be the simplest thing to do with the least code delta. The best thing to do would be to make the variable a parameter of whatever method you are calling, and then keep the variable local to your Loop() method. Then you have:

void Loop()
{
  if (condition)
  {
    Something(variable);
  }
  
  else
  {
    Something(update variable);
    Something(update variable);
    Something(update variable);
  }
}

void Something(variable)
{
  // do stuff here.
}

Of course, I can't see why you want to do this. All of this is logically invalid. If the value of variable needs to change before you act on it, then you have to rerun the entire decision block (because the value of the variable can now be whatever satisfies the if condition). This smells of bad design.

So my question is, what specifically and exactly are you trying to do?

[wasab]

Is that an assignment operator in the Boolean expression?  

 

Shouldn’t the = be a Boolean == operator? 

[coolgs10]

You can create a function like checkdistance() and it will check your distance and return the distance value and call it every time you want to check the distance.