Questions tagged [qt]
a cross-platform application framework for developing application software
122
questions
0
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1
answer
9
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PyQt5 Widget Background Color Incorrect on my Pi
I have searched high and low for this problem, but cannot find anything anywhere.
I have Python Version 3.8.10 and PyQt5 version 5.15.10 running in a Virtual Environment on my Py4 with 8Gb Memory ...
- 11
1
vote
0
answers
43
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Process/Flow/steps for speeding of the booting time in raspberry pi for the cluster
I am using Raspberry pi for the cluster, that would display the basic data like the CAN data and one wire data.
For can I used the Can-Socket and for one wire I am just reading a gpio pin of raspberry ...
- 11
0
votes
1
answer
51
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Pi Zero W goes black screen while running pyqt qml app
I wrote a pyqt5 app that uses QQmlApplicationEngine to load a qml file for the GUI. Now everything runs well on my PC and also on Raspberry Pi4b, but when I am trying to run it on Pi Zero W, it loads ...
0
votes
1
answer
99
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Qt6 compiler binary package
I'm aware I can cross-compile Qt6 on my dev machine or I can build the Qt6 from sources directly on the Rapsberry Pi.
But is there any binary package for the compiler? Like when you use the online ...
- 517
1
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0
answers
161
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Example of libcamera with Qt6 in c++?
I'm trying to build a Qt app on my RPi4 using libCamera in c++, but I keep having build/compile issues. Are there any examples of using libCamera in a Qt app in c++?
I'm using Raspbian bullseye, and ...
- 35
0
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0
answers
119
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PyQt QSoundEffect not working on Pi 4B
I am having a perplexing difficulty, in that I cannot get my PyQt program to produce any sound. I am able to get sound correctly from the Pi over HDMI using speaker-test and paplay, so I am happy ...
- 210
0
votes
1
answer
2k
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install qtcreator kit on raspberry pi 4b - 64 bit
I've tries sudo apt install qtcreator and menu / preferences / add/remove software - search qtcreator, check qtcreator, apply
both seem to install qtcreator ok. But it can't find any qt kit.
which ...
- 105
0
votes
1
answer
144
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/opt/cmake/bin/cmake no file in the directory
I am installing Qt6 using this guide
https://www.tal.org/tutorials/building-qt-62-raspberry-pi
and i am stuck in the Configure the Qt 6.2 build portion where it asks me to execute this line
/opt/cmake/...
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1
vote
1
answer
693
views
qtcreator desktop kit is greyed out
Its been quite a while since my last raspberry pi project. I went ahead and bought a new Rpi 4B and installed a fresh Raspbian OS on it and installed qt the way i remember it
$ sudo apt-get install ...
- 77
0
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0
answers
303
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can we send data or files via wifi from a Raspberry PI using a QT graphical interface to another pc under Windows?
so my Raspberry card is connected to a screen by HDMI, I want to develop an interface using the QT platform under linux to give the order to my Rpi card to send data or files and even to receive ...
- 1
0
votes
1
answer
447
views
Running python GUI application with PyQt and python-vlc as a service
I'm trying to run a python GUI application as a service. The application is using PyQt5 and python-vlc packages. I have the following service file:
[Unit]
Description="Python VLC Service Test&...
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2
votes
1
answer
364
views
Unable to get Qt5 audio to work using pulseaudio on Rpi 4
I'm on Raspberry pi 4 and the OS is DietPi
I configured ALSA so I could play an audio file successfully through HDMI using aplay [an audio file]
Then launched the PyQt5 app but got PulseAudioService: ...
- 31
0
votes
2
answers
588
views
Pyqt QCameraInfo.availableCameras() is empty
I'm doing a small project on Raspberry Pi 4. Also, I want to use QtMultimedia to list all cameras on pi, But it returns an empty list.
# This is my testing code
from PyQt5.QtMultimedia import ...
- 13
1
vote
1
answer
800
views
Download QT 5.12.0 on my Raspberry fails
I currently have the 5.11.3 Qt Version on my Raspberry 3 B+. For another program, I want to use I need at least Qt 5.12.0.
When I try
sudo apt-get install qt5-default
it says that I already ...
- 11
0
votes
0
answers
275
views
Run QT5 app (chiaki remote play) on raspberry OS lite
I would like to run Chiaki (Playstation Remote Play https://github.com/Fredrum/chiaki) on my raspberrypi zero WH running raspberrypiOS lite (so no GUI).
running chiaki itself on a raspberry pi(zero ...
- 113
3
votes
1
answer
62
views
magnetic field generated by the engine alternator affects gpio value
I am working on a dashboard for a motorcycle. I created a Qt application on my raspberry pi 4 on a raspberry pi os lite.
I have configured one of my GPIO as interrupt using the wiringPi library.
...
- 357
1
vote
0
answers
302
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QT Creator - Raspberry Pi - 3.5" TFT - Could not initialize egl display
Please forgive my ignorance but I'm new to Raspberry Pi/Linux.
I'm trying to make a touch screen app for the Pi using a 3.5" touch screen (xpt2046) and QT Creator (5.12.5).
QT Creator is running ...
2
votes
1
answer
2k
views
autostart application on raspberry pi 4 (systemd)
I am working with raspberry pi os lite on raspberry pi 4.
I wanted to autostart a Qt application.
I created under /etc/systemd/system a .service file named application_one.service
this is what the ....
- 357
1
vote
1
answer
127
views
Qt Quick cross compiled application didn't show images on raspberry pi 4
I cross compiled Qt5.14.2 for my raspberry pi 4 on a raspberry pi OS lite
after that I created a Qt Quick application on my Ubuntu and I integrated images in my qml file
Image {
id: compteur
...
- 357
0
votes
1
answer
4k
views
How to install PySide2 on RaspberryPi?
i use this command to install PySide2:
$ pip3 install pyside2
and i get this error:
ERROR: Could not find a version that satisfies the requirement pyside2 (from versions: none)
ERROR: No matching ...
- 159
1
vote
0
answers
199
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pi4 crashes when running any QT apps like RPi imager, VLC, OBS
when opening for example VLC in stock rpiOS the window that asks for metadata network access opens, but its so large that the text in the menu bar takes almost all of my screen and after some time my ...
- 31
0
votes
1
answer
47
views
Updating text file with sensor datas from three different threads
I am getting values from three different sensors connected to Raspberry Pi. I am using a ADC grove to get those data's. I am updating these sensor data with date and time in a text file. The problem ...
0
votes
1
answer
1k
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Cross compiling QT 5.14 for raspberry pi 4 [ Could not queue DRM page flip on screen HDMI (invalid argument) ]
I have cross-compiled Qt 5.14 on raspberry pi 4 using ubuntu 18.04
I just followed al the steps of this tutoriel https://www.youtube.com/watch?v=TmtN3Rmx9Rk&t=2538s
the code is just right here ...
- 357
2
votes
1
answer
567
views
No audio through 3.5mm jack when using QtMultimedia on RPI4B
I am currently trying to run a PYQT5 GUI on my RPI 4B using PYQT5 and its QtMultimedia.
I have 2 speakers (running through an amp) connected through the 3.5mm jack (BMC2835 headphones), and while ...
- 31
1
vote
0
answers
37
views
Horizontal lines on qt 5.13 app . Problem doesn't present with virtual screen (chvt) manipulation
I have a full-screen app in kiosk mode that runs on qt 5.13.2 (Qt compiled from source). Up until 1 week ago, it displayed just fine. Then, I did an apt dist-upgrade and I now get horizontal lines ...
- 609
2
votes
0
answers
281
views
OpenCV cross-compilation fails
I have cross-compiled Qt on my CentOS host for my Raspberry Pi and now I want to cross-compile OpenCV with the following script:
CORES=4
IP=192.168.178.52
TEMP_PATH=/home/kampi/OpenCV
SYSROOT_PATH=/...
- 203
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0
answers
4k
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Could not initialize egl display
I have a CentOS host which should be used to develop Qt applications (version 5.12.8) for a Raspberry Pi. I use the following Raspberry Pi setup:
$ cat /proc/cpuinfo
...
model name : ARMv7 ...
- 203
0
votes
2
answers
4k
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installing qt on raspberry pi 4
I'm installing Qt to my raspberry pi-4 for image processing project. I use the commands:
sudo apt update
uname -a
apt-cache search qt5
apt-cache show qt5-default
apt-cache search qtcreator
apt-cache ...
- 21
1
vote
1
answer
1k
views
SIP Generator Error Installing ROS Melodic on Raspberry Pi 4
I've been attempting to install ROS Melodic on my Raspberry Pi 4 (running Raspbian Stretch) according to the instructions on this webpage:
[https://www.instructables.com/id/ROS-Melodic-on-Raspberry-...
- 11
1
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0
answers
240
views
Cross-compiling QT interface to a Raspberry PI 3
I'm trying to install Qt interface to a Raspberry Pi 3, which raspbian is the "2016-05-27-raspbian-jessie".
I didn't want to install, directly, all the packages on the raspberry so as to let ...
- 19
0
votes
0
answers
684
views
Raspberry pi - QT webenginewidgets problem
I use raspberry pi and QT (version 5.7.1). When I use
QT += webenginewidgets , I get an error
Project ERROR: Unknown module(s) in QT: webenginewidgets
however I try to install
-sudo apt-get install ...
1
vote
1
answer
574
views
Cross-compile of Qt for Raspberry Pi fails for XCB support with updated toolchain
I had successfully cross-compiled Qt 5.11.2 for Raspbian Buster on Ubuntu 18.04 host mostly using these guides:
https://www.ics.com/blog/configuring-qt-creator-raspberry-pi
https://wiki.qt.io/...
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2
votes
0
answers
2k
views
Why GLX or EGL is not enabled when running QT program?
To start with I have to say I was trying to make cross-compilation work for Ubuntu with Raspberry Pi 3+ B. I used this tutorial https://wiki.qt.io/RaspberryPi2EGLFS and QT in version 5.12.4. Tried it ...
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2
votes
1
answer
61
views
Compile Qt application on Raspberry Pi and Run that application on other ARM device. Will it work?
I am compiling One Qt application on Raspberry Pi and Run it on different ARM device like Microchip or TI board without compile again. will it work??? if both the side Qt version is same.
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0
answers
69
views
MFRC522 and Bluetooth not work together
I have a program in which I use pyqt5, MFRC522 and bluetooth. I have 3 threads, one for the interface, one for the MFRC522 and one for the bluetooth. If I run the MFRC522 and the bluetooth separately ...
- 1
1
vote
1
answer
1k
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symbol lookup error: undefined symbol: _ZN7QWidget8qwsEventEP8QWSEvent
I have cross-compiled executable file from QT 4.8.7. I am running it on a Raspberry PI (Ubuntu), with QT 4.8.7 and QT declarative module installed. When i run the executable file on my raspberry pi, i ...
- 31
0
votes
3
answers
1k
views
Configure Raspberry pi to run my application before GUI Desktop
I have created an application through Python that has library dependencies on Qt4, pyqt4, pyqtgraph etc. This application is based on Raspberry Pi, I have developed and finished it on the platform.
I ...
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-1
votes
1
answer
294
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How to use at the same time 2 hardware pwm in wiringpi
I need help to configure 2 hardware PWM channels. I am developing device, and sometimes I will need active 2 PWM channels with different frequencies (frequencies is low: 410 and 580 Hz).I'm writing ...
1
vote
3
answers
3k
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How do I build Qt's mysql-plugin on Raspbian Buster
I try to build the MySQL plugin on a Raspbian Buster with C++ and Qt 5.12.4. Building Qt itself worked fine by following this tutorial: https://www.tal.org/tutorials/building-qt-512-raspberry-pi
...
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1
vote
1
answer
791
views
Failure to build QT5 5.12.3 on Raspberry Pi zero
Following the instructions in https://www.tal.org/tutorials/building-qt-512-raspberry-pi,:
wget http://download.qt.io/official_releases/qt/5.12/5.12.3/single/qt-everywhere-src-5.12.3.tar.xz
tar xf qt-...
- 189
2
votes
0
answers
687
views
Qt cross compilation *QOpenGLShaderProgram: could not create shader program* error
I am using the QT Creator for my laptop (Linux LMDE 3 Cindy OS) And for Raspberry Zero Cross-compiling.
I have installed the QT based of this instruction and by this setting:
mkdir ~/raspi
...
- 189
1
vote
0
answers
694
views
RaspberryPi2EGLFS guide - EGL/GLES libraries fix fail
I built Qt 5.12.3 for Raspberry Pi following the RaspberryPi2EGLFS guide from Qt Wiki.
I was able to reproduce almost each one of the steps described in the guide, but on step 14 (EGL/GLES libraries ...
- 111
2
votes
1
answer
129
views
Does a binary built on pi 3 will work on pi 2?
I'm building an app on a raspberry pi 3. I'm using Qt. Will the generated binary work on raspberry pi 2?
Thanks
- 131
1
vote
1
answer
1k
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Raspberry Pi 3 B+ QMediaPlayer - unable to play sound
I'm struggling to play audio files using Qt 5.11.3 and the QMediaPayer class.
There is no sound output when playing either .mp3 or .wav files.
I had some success to play a wav file using QSound class.
...
- 41
0
votes
0
answers
32
views
The application stalls when the service is loaded at startup
I have RPI3B + with Raspian Stretch on which I run the QT application.
When I create my service to launch the application after starting the rpi i have problems.. The application starts and then the ...
- 11
1
vote
0
answers
219
views
Raspberry Pi Qt toolchain on Ubuntu 16.04
I have issues creating a tool-chain for cross compiling Raspberry Pi 3 Qt applications through Ubuntu. I used directions from this guide, https://wiki.qt.io/Raspberry_Pi_Beginners_Guide, to help me ...
- 11
2
votes
0
answers
1k
views
Latest Qt5 does not provide EGLFS during cross-compilation
Some time ago I set up a Linux host to cross-compile Qt5. I used this configure command:
./configure -release -opengl es2 -device linux-rasp-pi3-g++ -device-option CROSS_COMPILE=~/opt/tools/arm-...
- 517
1
vote
1
answer
297
views
Qt Userland raspistill/racpicam integration - Unable to find an X11 visual which matches EGL config
I am developing simple gui app for a client on Raspberry pi running Ubuntu(Mate) 16.04 using Qt 5.5.1 and OpenCV for some face recognition (all C++) using 5MP pi camera.
The framerate/CPU usage ...
- 223
1
vote
2
answers
809
views
Socketcan and Qt on raspberry pi
Is there a prebuild serialbus library for Raspberry Pi? I would to use
QtCanBus in a project.
Unfortunately I cannot find any reference for installing the necessary library.
tried
sudo apt-get ...
- 41
0
votes
1
answer
234
views
How can I use the free version of Qt to create a GUI for the Raspberry Pi?
I am working on a project that requires high-medium quality GUI. I am thinking of cross compiling from Windows to Raspberry Pi or from Ubuntu to Raspberry Pi. Also, I do not know which one of those ...
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