I can't make sensors works on my Asus Transformer T100.

Magnetometer and Compass don't start, and I have fake value from the accelerometer (always x=0, y=9.8, z=0).

I always get the same result, even with my laptop :

first textEdit:

Initialisation...
QAccelerometer is connected to backend...
QAccelerometer isActive...
Attente des données capteur...

Second textEdit:

ven. juin 6 14:56:41 2014
Acceleration: x = 0
y = 9.8
z = 0
Compass: UNAVAILABLE
QMagnetometer: UNAVAILABLE

And this code :

QList<QByteArray> sensorList = QSensor::sensorTypes();
ui->init->append("Sensor list length: " + QString::number(sensorList.size()).toUtf8());
foreach( QByteArray sensorName, sensorList ) { ui->init->append("Sensor: " + sensorName);
}

Give me :

Sensor: QAmbientLightSensor
Sensor: QAccelerometer
Sensor: QTiltSensor
Sensor: QOrientationSensor
Sensor: QRotationSensor

Where is QCompass ? QMagnetometer ? Why QAccelerometer is faked ? :'(

Here is my simplified test-code, only with QCompass :

header:

#ifndef MAINWINDOW_H
#define MAINWINDOW_H
#include <QMainWindow>
#include <QCompass>
#include <QCompassReading>
namespace Ui {
class MainWindow;
}
class MainWindow : public QMainWindow
{ Q_OBJECT
public: explicit MainWindow(QWidget *parent = 0); ~MainWindow();
public slots: void update(); void error(int);
private: Ui::MainWindow *ui; QCompass *compass; QCompassReading *compass_reading;
};
#endif // MAINWINDOW_H

code :

#include <QDateTime>
#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <QMessageBox>
MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent), ui(new Ui::MainWindow)
{ ui->setupUi(this); ui->init->setText("Initialisation..."); compass = new QCompass(this); connect(compass, SIGNAL(readingChanged()), this, SLOT(update())); connect(compass, SIGNAL(sensorError(int)), this, SLOT(error(int))); compass->setDataRate(1); compass->start(); if (compass->isBusy()) { ui->init->append("QCompass is busy..."); } if(compass->isConnectedToBackend()) { ui->init->append("QCompass is connected to backend..."); } if(compass->isActive()) { ui->init->append("QCompass isActive..."); } ui->init->append("Waiting for sensors...");
}
MainWindow::~MainWindow()
{ delete compass; delete ui;
}
void MainWindow::update()
{ QString text_compass; ui->textEdit->clear(); accel_reading = accel->reading(); compass_reading = compass->reading(); if(compass_reading != 0) { text_compass = QDateTime::currentDateTime().toString() + + "\nCompass: azimuth = " + QString::number(compass_reading->azimuth()); + "\ncalibration level = " + QString::number(compass_reading->calibrationLevel()); ui->textEdit->append(text_compass); } else { text_compass = "\nCompass: UNAVAILABLE"; ui->textEdit->append(text_compass); }
}
void MainWindow::error(int erreur) { QMessageBox::critical(this, "Erreur", "Erreur num : " + QString::number(erreur).toUtf8());
}

1

1 Answer

The solution for now is to hack the winrt sensors plugin and rebuild it. (the sensors backend for winrt works for windows 7/8 desktop application).

First git clone the plugin, or get Qt's source code.

then open src/plugins/sensors/sensors.pro and add these lines :

win32-msvc2012|win32-msvc2013 { isEmpty(SENSORS_PLUGINS): SENSORS_PLUGINS = winrt generic dummy
}
winrt|win32-msvc2012|win32-msvc2013 { isEmpty(SENSORS_PLUGINS)|contains(SENSORS_PLUGINS, winrt):SUBDIRS += winrt
} 

REMOVE this line :

isEmpty(SENSORS_PLUGINS)|contains(SENSORS_PLUGINS, winrt):winrt:SUBDIRS += winrt 

Then open src/plugins/sensors/winrt/winrt.pro and add this lines :

win32-msvc2012|win32-msvc2013: LIBS += -lruntimeobject

And finally run qmake, make/nmake, make/nmake install (Ask google for more informations about how to build)

IMPORTANT : the run process should start from the directory where the qtsensors.pro file is (e. g. C:\Qt\5.4\Src\qtsensors).

To get more informations, and follow :

• Link to the bug :
• Link to the patch :

4

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