Error unknown typ name 'DS18B20'

SGaist

As silly as it may sound, the file on github at least is all uppercase, is it also the case for yours ?
If so, then I would start by updating the include. Depending on your machine and configuration, the file system might be sensible to that.

mrjj

Hi
Also when you extracted it, did you put it directly in your project folder or
is in a sub folder called src ?

AlexKrammer

@SGaist
no it wasn't. But if i changed it, i got the error "file not found"
only i write it like ds18b20 i dont get an error.
what do you mean it depends on machine and configuration?

@mrjj
First i put it in the project folder with an folder called "Libraries" in it.
now i put it directly und after that in a folder called src. Nothing changed.

SGaist

Some file systems are case insensitive and others not.

AlexKrammer

@SGaist
Yes. I know what you mean. But i think the mistake is not to include the file. because there is no error message.

mrjj

@AlexKrammer
Hi
I just tried putting DS18B20.h and DS18B20.cpp directly in the project folder.
(where .pro file is )
and then add them to the project using the Right-click menu as shown and
it seems to like it just fine.

AlexKrammer

@mrjj
Oh yes. Now it works. But if i tried the Library in github it didnt work.
i created a new .h and .cpp file and copied the .h und .cpp file from the post 3 years ago into that. now the bugs are fixed. Thanks for that.
Now the next problem ^^.
i just added "tempReader_ = new DS18B20(address);" to my MainWindow::MainWindow.
Now, what's adress?
The second thing:
If i try to create a new class called check temperature and i try to create a new object with "DS18B20 sensor;" i receive the following error massage: "No matching constructor for initialization of'DS18B20'.

My background. Im trying to create an app with RaspberryPi in QT with using C++ und wiringpi.
In order to control the temperature of 5 sections of an area im going to use the sensor DS18B20.
At the first problem. is the adress the pin that i chose to use for the sensor. e.g. digitalRead(22); but this cant be i think.

thanks for help!

mrjj

@AlexKrammer
well the constructor is
DS18B20::DS18B20(uint8_t pin)
so it does seem like the pin.

DS18B20 sensor;" i receive the following error message: "No matching constructor for initialization of'DS18B20'.

if we have the same .h , the compiler is correct. There is no default constructor
and you must create it with and uint8_t as a parameter.

also looking at this
https://www.tweaking4all.com/hardware/arduino/arduino-ds18b20-temperature-sensor/

its seems correct :)

AlexKrammer

@mrjj
no mine is a other one.
when i use the arduino library i got this.

there are a lot of errors. then i delete it and created a .h and .cpp file with that code.

ds18b20.h

#define DS18B20_H_
#include <inttypes.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>

#define CELCIUS 0
#define FAHRENHEIT 1
#define BUS "/sys/bus/w1/devices/"
#define TEMPFILE "/w1_slave"

class DS18B20 {
public:
    DS18B20(const char* address);
    virtual ~DS18B20();
    uint8_t getUnits();
    void setUnits(uint8_t);
    float getTemp();
    float CtoF(float);
private:
    uint8_t unit_;
    char* address_;
    char path[47]; // path should be 46 chars

};

ds18b20.cpp

#include "ds18b20.h"

DS18B20::DS18B20(const char* address) {
    address_ = strdup(address);
    unit_ = CELCIUS;
    snprintf(path, 46, "%s%s%s", BUS, address_, TEMPFILE);
}

DS18B20::~DS18B20() {
}

float DS18B20::getTemp() {
    FILE *devFile = fopen(path, "r");
    if (devFile == NULL) {
        printf("Count not open %s\n", path);
        perror("\n");
    }
    float temp = -1;
    if (devFile != NULL) {
        if (!ferror(devFile)) {
            unsigned int tempInt;
            char crcConf[5];
            fscanf(devFile, "%*x %*x %*x %*x %*x %*x %*x %*x %*x : crc=%*x %s", crcConf);
            if (strncmp(crcConf, "YES", 3) == 0) {
                fscanf(devFile, "%*x %*x %*x %*x %*x %*x %*x %*x %*x t=%5d", &tempInt);
                temp = (float) tempInt / 1000.0;
            }
        }
    }
    fclose(devFile);

    if (unit_ == CELCIUS) {
        return temp;
    } else
        return CtoF(temp);
}

uint8_t DS18B20::getUnits() {
    return unit_;
}

void DS18B20::setUnits(uint8_t u) {
    unit_ = u;
}

float DS18B20::CtoF(float temp) {
    return temp * 1.8 + 32;
}

now im on this problem:

what kind of .h file do u use and where did u download that, that there are no errors.

mrjj

Hi
I downloaded from your link
https://www.arduinolibraries.info/libraries/ds18-b20
But i don't have a board so don't know if it actually works.
It does complain about me not having
#include "Arduino.h"
#include <OneWire.h>

but that is expected. The actual .h and .cpp seems happy enough.

I goggled the use of
DS18B20::DS18B20(const char* address)
to see what they would put as adresss but could not find a single example of that.
But plenty of DS18B20 examples otherwise

AlexKrammer

@mrjj
now i removed the .h and .cpp file

i just downloaded the libraries again and i got the same problem like in the first picture. why dont you have
#include "Arduino.h"
#include <OneWire.h>
and what did you do that you dont get the error unkown type name "uint8_t"
the error is still hundreds time here.

mrjj

hi
I dont have a board so i dont have the Arduino software / libs installed so no #include "Arduino.h" etc.

the uint8_t comes from
#include <stdint.h>

AlexKrammer

@mrjj i dont use arduino too. Raspberry Pi is what i use.
The stdint.h is just a standart library or where can i get it?

If this change remove the error do u thing when i type in a raspberry pin into the constructor e.g. 22 it will work?

mrjj

@AlexKrammer
Oh
I just assume since it had Arduino included and most google searches talked about Arduino :)

Well i just added
#include <stdint.h>
and it knew it.
So its included on newer compilers.

If this change remove the error do u thing when i type in a raspberry pin into the constructor e.g. 22 it will work?

Yes if it has that chip then yes.
https://www.circuitbasics.com/raspberry-pi-ds18b20-temperature-sensor-tutorial/

AlexKrammer

@mrjj
And if i create a new class called "CheckTemlerature" how could i use the DS18B20 sensor.
The first thing to open the constructor with input the Raspberry Pin.
Second step Funktion getTemp?
Third step close with destructor?
Thanks for halp

mrjj

@AlexKrammer
Yes, it seems that way looking over the examples.

are you using the
DS18B20::DS18B20(const char* address) version or the other version using uint pin ?

AlexKrammer

@mrjj
I deleted the DS18B20::DS18B20(const char* address) version and try it with your idea. I hope it will work but ill see it tomorrow. Its enough for today.
Thanks a lot.

AlexKrammer

@mrjj
Now i removed the
#include "Arduino.h"
#include <OneWire.h>

and added #include <stdint.h>

But now i receive the error massage with OneWire again.
How did you solve that problem?

The second fault is that the .cpp produced a lot of errors too.
I think it depends on the OneWire file.

How did you solve that problem?

mrjj

Hi
That include file comes from
https://www.pjrc.com/teensy/td_libs_OneWire.html
But im not sure that works with a RaspberryPi directly.

AlexKrammer

@mrjj
that to files OneWire.h and OneWire.cpp include also like DS18B20 as existing File?