maemo.org - Talk - PySide script does not print sensor data

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- - PySide script does not print sensor data (https://talk.maemo.org/showthread.php?t=81214)

PySide script does not print sensor data

I am not perfectly sure I am writing this on the right forum, so apologies if the forum is not correct.

So, I decided to try and give a look on the data the sensors deliver in my N9, but hit a wall.

I thought that it would be relatively easy to just create a python script that prints out accelerometer and/or compass data. So, I installed python and some bindings as instructed in

http://wiki.meego.com/Python/Harmattan/Getting_started

(Note: python-modules-all was not found)

Then, found some example codes:

http://qt.gitorious.org/pyside/pysid...bility/sensors

and

http://wiki.meego.com/User:Mdengler

Both get stuck somewhere before getting to the output generating part. Typical output, after which the process must be killed manually:

Code:

~/python $ python ac.py 

Using the meego graphics system

loaded the Generic plugin 

loaded the grue plugin 

Loaded the MeeGo sensor plugin 

Setting data rate 0 Hz (interval 0 ms) for "meego.accelerometer" 

Setting data rate 0 Hz (interval 0 ms) for "meego.magnetometer"

Finally, I tried to generate as simple script as I could:

Code:

import sys

from PySide.QtCore import *

from QtMobility.Sensors import *

                                

app = QCoreApplication(sys.argv)

sensor = QAccelerometer()       

sensor.start()                  

reading = sensor.reading()      

print reading.x(), reading.y(), reading.z()

Which gives following output:

Code:

~/python $ python acc.py  

loaded the Generic plugin 

loaded the grue plugin 

Loaded the MeeGo sensor plugin 

Setting data rate 0 Hz (interval 0 ms) for "meego.accelerometer" 

0.0 0.0 0.0

~/python $

Now, I would expect one of those to be slightly below 10 if the phone is lying still. I tried similar script for the compass sensor, and I got a bearing of 0 regardless which direction the phone was turned.

So, what have I missed?

Thanks,

Gybe

Re: PySide script does not print sensor data

Here is an example that works for me:
http://qt.gitorious.org/pyside/pysid...cceleration.py

nicolai

Re: PySide script does not print sensor data

Quote:

Originally Posted by nicolai (Post 1143527)

Here is an example that works for me:
http://qt.gitorious.org/pyside/pysid...cceleration.py

nicolai

Thanks nicolai, that is one of the example scripts I tried, with following output:

Code:

~/python $ python show_acceleration.py 

loaded the Generic plugin 

loaded the grue plugin 

Loaded the MeeGo sensor plugin 

Setting data rate 0 Hz (interval 0 ms) for "meego.accelerometer" 

^C^Z[1]+  Stopped                    python show_acceleration.py

~/python $ python ./show_acceleration.py 

loaded the Generic plugin 

loaded the grue plugin 

Loaded the MeeGo sensor plugin 

Setting data rate 0 Hz (interval 0 ms) for "meego.accelerometer" 

^Z[2]+  Stopped                    python ./show_acceleration.py

~/python $ python ./show_acceleration.py -r 100



loaded the Generic plugin 

loaded the grue plugin 

Loaded the MeeGo sensor plugin 

Setting data rate 100 Hz (interval 10 ms) for "meego.accelerometer" 

^Z[3]+  Stopped                    python ./show_acceleration.py -r 100

It simply does not produce any output after it tells me that it has set the data rate, which forces me to kill the process manually.

So basically I have copied the script file to my n9 and run it as user. Is this how you do it as well?

Is there something I need to enable if I want my scripts to use the data from sensors?

Gybe

Re: PySide script does not print sensor data

Yes, I started this script from xterm application on my N950
and over ssh. On both ways it produces an output like:
Acceleration: -4.42 x 0.18 y 13.42 z m/s^2 11.00 ms since last, 87.85 Hz
Acceleration: -2.12 x 1.59 y 6.71 z m/s^2 110.00 ms since last, 9.05 Hz
Acceleration: -2.12 x 1.59 y 6.71 z m/s^2 32.00 ms since last, 31.03 Hz

It only produces an output while the screen is unlocked.

Re: PySide script does not print sensor data

Quote:

Originally Posted by nicolai (Post 1143546)

It only produces an output while the screen is unlocked.

That was it. Thanks very much.