Error unknown typ name 'DS18B20'

AlexKrammer

@mrjj
Is there a possibility to share a code with you?
I just created a simple code to show my problem.

mrjj

@AlexKrammer
Yes even i cant really run it i can look it over and see if i get a hint.
use https://wetransfer.com/
click the (...) button and switch to link type
then drag zipped project to there
and paste link here.

AlexKrammer

@mrjj link text

Now i created the project on Windows.
You should be able to run it.

The two commented debug lines in checktemperature.cpp and mainwindow.cpp show the misstake.
if you are uncomment one in checktemperature.cpp its still stay at 0.
Also if you uncomment this: //qDebug() << C.TempEin; //must be the value of the horizontal slider in mainwindow.cpp. its still stay at 0.

Try to run that example

mrjj

@AlexKrammer
Super. I will later tonight. I have to drive now :)
had a fast look.
You are not setting anything to C. only reading from it.
Nothing changes the S and R inside C.
Only the ones you have free in main.
So that is why it stays at zero.

AlexKrammer

@mrjj
For sure. I'm trying to use this class to compare something.
So yeah nothing changes S and R inside C but S.getHystTemperature(); will be changed if the Slider moved. and R.actualTemp1 will be changed, if cnt hit 3 in MainWindow::LOOP
or rather in real if the sensor will be evaluated.
So if i call the methode C.CheckTemp(); S.getHystTemperature() and R.actualTemp1 do have values who could be compare.
if i code:

TempEin = S.getHystTemperature();
Test = R.actualTemp1;

i'm going to set the Variable TempEin equal to S.getHystTemperature() (Which is changed when the slider moved)
and i'm going to set Test equal to R.actualTemp1 (Which every times change when cnt hits 3 in MainWindow)
Or isnt that the correct way to compare something or rather put values from a other class into a class?

mrjj

Hi
Just so we agree. Nothing you do in mainwindow with S/R
will have any effect on the S and R in C.

C.CheckTemp(); S.getHystTemperature() and R.actualTemp1 do have values who could be compare.

Yes if in real code something actually changes them.
In the Demo, they will always stay zero as the slider changes S/R in main and
those new values are not out into C.
so in demo code
C.TempEin will never change.

Else i see nothing wrong but I not sure why you have both
SetTemperature S;
ReadTemperature R;
in maniwindow

and then also in C. could those in C not be enough ?

AlexKrammer

@mrjj
No that is not true.
In mainwindow i change the slider. So i change HystTemperature.
That will change S.getHystTemperature(); too. Doesnt it?

Also every 2.5 second when the cnt hit 3 in mainwindow. The actualTemp1 will be incremented with 1. So R.actualTemp will be greater then before. Doesnt it?
So why are in Class C the Variable not changing?

In order to to change the varibale like in my fault. I must have this in MainWindow. When i move the slider im going to change the variable HystTemperature.
Here in the demo its the same like in real. Every 2.5 second the sensor will be evaluated. So here in the demo only incremented with 1.

Im changing the Variable R.actualTemp1 and S.getHystTemperature in MainWindow.
In order to compare both varibales i created a new class.
So why arent in Class CheckTemperature the variables changed?

mrjj

@AlexKrammer

That will change S.getHystTemperature(); too. Doesnt it?
Hi
Not at all. the S/R in mainwindow are on its own and will not affect those in C.
So why arent in Class CheckTemperature the variables changed?

As nothing changes them.

Maybe this is why i get confused about what is not working.

The slider changes the values of S/R in MainWin. Not in C.s / C.r so
did you expect the values in C to also change ?

AlexKrammer

@mrjj
well if i change the variable of e.g. Class" SetTemperature" float "HystTemperature"
And if i call the methode S.getHystTemperature(); i try to get the variable HystTemperature.

Or is that the wrong way to put the Varible which is changed by the slider into the Class "CheckTemperature"

then my next question would be how can I do that? :)
Putting the changed variable "HystTemperature" from class "SetTemperature" and the changed variable "actualTemp1" from class "ReadTemperature" into the class "CheckTemperature".

mrjj

@AlexKrammer
hi
to change the one inside C with slider it has to be

void MainWindow::on_horizontalSlider_valueChanged(int x)
{
    float y;
  ///  S.setHystTemperature(x);
 C.S.setHystTemperature(x);

///    y = S.getHystTemperature();
 C.S.getHystTemperature(x);
    QString Temp = QString::number(y);
    ui->label->setText(Temp + "°C");
}

Putting the changed variable "HystTemperature" from class "SetTemperature" and the changed variable "actualTemp1" from class "ReadTemperature" into the class "CheckTemperature".

auto value1 = S.getHystTemperature();
auto value2 = R.actualTemp1;

C.setHystTemperature(value1);
C.R.actualTemp1 = value2;

something like that.

Its very confusing you named the classes as function names :)
SetTemperature rally looks like a function but its a class.

AlexKrammer

@mrjj

 auto value1 = S.getHystTemperature();
 auto value2 = R.actualTemp1;
 C.setHystTemperature(value1);
 C.R.actualTemp1 = value2;

i dont understand this step... cause i dont have a C.setHystTemperature thats a methode at SetTemperature

void MainWindow::on_horizontalSlider_valueChanged(int x)
{
    float y;
  ///  S.setHystTemperature(x);
 C.S.setHystTemperature(x);

///    y = S.getHystTemperature();
 C.S.getHystTemperature(x);
    QString Temp = QString::number(y);
    ui->label->setText(Temp + "°C");
}

if you write: C.S.setHystTemperature(x); do you set HystTemperature in Set Temperature and also in CheckTemperature? Do I understand right?

mrjj

@AlexKrammer

-i dont understand this step... cause i dont have a C.setHystTemperature thats a methode at SetTemperature

ok but the idea is the same. just use the correct method/variable then.
C.setXXX (value1); or
C.S.xxx = value

if you write: C.S.setHystTemperature(x); do you set HystTemperature in Set Temperature and also in CheckTemperature? Do I understand right?
yes you ONLY set in C.S. not the ones in mainWindow.
So slider ONLY changes the one in C.

AlexKrammer

@mrjj
do you mean

void MainWindow::on_horizontalSlider_valueChanged(int x)
{
    float y;
  ///  S.setHystTemperature(x);
C.S.setHystTemperature(x);

///    y = S.getHystTemperature();
    y = C.S.getHystTemperature();
    QString Temp = QString::number(y);
    ui->label->setText(Temp + "°C");
}

LOOP
{
    C.R.readTemperature(1);
}

and why should i only set it in CheckTemperature and not the Classvarible? Shouldn't i do i both?

mrjj

@AlexKrammer

Yes if you want BOTH to change you should set both.
both in C.xxx and directly with S/R in mainwindow :)

AlexKrammer

@mrjj
i dont understand haha.
how and where should i set both?

And what do you mean with C.xxx the only thing that i have in the class CheckTemperature is the methode CheckTemp

mrjj

@AlexKrammer
Ok i not sure i understand what you really want either. :)
Its feels like you expect something magical to happen to the C.s/R.r

And what do you mean with C.xxx the only thing that i have in the class CheckTemperature is the methode CheckTemp

i mean what ever you want to set in the class.
maybe its C.s instead.

AlexKrammer

@mrjj
hahaha :D

nobody knows anything yet :D

Summery:
First i got one Class called SetTemperature.
In that class is a variable HystTemperature.
In order to change the value of that variable you need to create a object of Set Temperature like:

SetTemperature S;
S.setHystTemperature(e.g. 5);

to receive that variable you also use:

float x;
Set Temperature S;
x = S.getHystTemperature();

The second class called "ReadTemperature" got one methode to evaluate the temperature and save it in the class variable actualTemp1. First you have to create an object of the class like:

ReadTemperature R;
R.ReadTemp(1);
//Then actualTemp1 will be changed e.g. incremented by 1

Then the third class should compare that both variables. So i have to create 2 object of each class and call the variables like:

float x;
float y;

SetTemperature S;
ReadTemperature R;

x = S.getHystTemperature();
y = R.actualTemp1;

thats the only thing i want.
But what do you mean e.g. with C.S.getHystTemperature() and so on?
Where do you take de C.S.getHystTemperature()? and what should it do?

Also with

auto value2 = R.actualTemp1;
C.R.actualTemp1 = value2;

Where comes and what is C.R.actualTemp1^^

mrjj

@AlexKrammer
hehe lots of talk for 2 floats :)
Ok first part i fully understand. seems fine.
but not sure what you need the C class for then ?

I dont understand when you will update ITs C/S and such.
Maybe just drop C completely and do what you want to do with C/S in mainWin ?

AlexKrammer

@mrjj
yes it should be possible.
But to keep the structur and let it look quiet professional i'd tried to put it into a class.
But the one thing that i dont understand yet is. If i create a object each class in CheckTemp and try to call the variables out of them. why they dont include the values which i gave them e.g when the slider moved.

mrjj

@AlexKrammer said in Error unknown typ name 'DS18B20':

But the one thing that i dont understand yet is. If i create a object each class in CheckTemp and try to call the variables out of them. why they dont include the values which i gave them e.g when the slider moved.

Because they are NOT tied to the S/R in main. its own variables and unless you
directly write to them via C.s then they stay at zero.

So when you change C/S that lives in main, the ones in C does not change with them
They are seperate variables and has own values and will only change if you directly do that.

much like

int NUM =4;

class Test {
int NUM=0;
}

TEST c;

NUM = 100;

will have not change c.NUM at all.