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Gybe is offline Gybe
2011-12-30 , 15:19
Posts: 13 | Thanked: 12 times | Joined on Oct 2011
#1
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
 
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nicolai is offline nicolai
2011-12-30 , 15:57
Posts: 1,637 | Thanked: 4,424 times | Joined on Apr 2009 @ Germany
#2
Here is an example that works for me:
http://qt.gitorious.org/pyside/pysid...cceleration.py

nicolai
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Gybe is offline Gybe
2011-12-30 , 16:21
Posts: 13 | Thanked: 12 times | Joined on Oct 2011
#3
Originally Posted by nicolai View Post
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
 
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nicolai is offline nicolai
2011-12-30 , 16:44
Posts: 1,637 | Thanked: 4,424 times | Joined on Apr 2009 @ Germany
#4
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.
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Gybe is offline Gybe
2011-12-30 , 16:49
Posts: 13 | Thanked: 12 times | Joined on Oct 2011
#5
Originally Posted by nicolai View Post

It only produces an output while the screen is unlocked.
That was it. Thanks very much.
 

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