application help

[ludoQtCreator]

Hi everyone,

I'm trying to create a Qt application to run GPIOs on the Raspberry Pi with sensors.

I'm having trouble.

The interface works fine.
I have a screen (mainwindow class) with 5 QLCDNumbers that display temperatures read from a "temperatures" file (QSetting class) every 10 seconds using Qtimer.
This screen also displays animated GIFs based on the GPIOs.

mainwindow launches threadSondes (QThread class) and launches gainable (Gainable (gpios) class).

threadSondes writes the temperatures of the 5 sensors to "temperatures" (QSetting class) every 15 seconds using Qtimer.

The ducted system starts functions (cooling, heating, and heatwave) and launches a QTimer every second to update the functions.

My problem is that the thread's QTimer blocks my animated GIFs while the temperatures of the 5 sensors are being written.

And in my terminal, I have:

QObject::startTimer: Timers can only be used with threads started with QThread

Can anyone give me a procedure? Thanks.

here is my github link
https://github.com/ludoiphone/QtGainable

[d_stranz]

QObject::startTimer: Timers can only be used with threads started with QThread

QTimer requires an event loop, since it uses signals and slots to communicate its status. That means you either have to start it in the main application (QApplication-based instance) or in a thread started by QThread. If you are trying to use QTimer somewhere else, it will not work.

[ludoQtCreator]

Okay, thanks.

I think I'm doing it wrong with QTimer and QThread.

I need to find the right order. I've tried a lot of things but can't get it right (especially with my sensors).

I'm trying to get a graphical interface (mainwindow).

I need to read the temperature file (QSetting) every 10 seconds (QTimer), all the time.

Furthermore, I need to write the temperature file (QSetting) every 15 seconds (QTimer), all the time.

And my pin management (GPIOs) needs to work every 1 second (QTimer), or not if possible (with slots and signals maybe), all the time.

And in my code on GitHub, it works.

But I encounter a problem when I write my temperatures via the sondes.cpp class
in temperatures(QSetting)

When I use the Qtimer without the probes thread class and with the run() function, I set a sleep(10) value, it works, but after a while my probes disconnect from the Raspberry Pi.