Sensor Analyzer v1.2 S60v3 SymbianOS Python Update

**kindaichi** · May 22nd, 2008, 08:28 AM

Sensor Analyzer v1.2 S60v3 SymbianOS Python Update - 12th May 2008

Version History

* 1.2 2008-05-12 Sensor data visualization with vectors and moving dot graph. Possibility to change zoom level (1 - 10). Switch views with left and right arrow.
* 1.1 2008-05-08 Visualize raw sensor data. Bars idea based on Aapo Rista modified verlet.py
* 1.0 2008-05-07 Based on Sensor Sample + debug code to see raw sensor data

Tested with pyS60 1.4.3 in N82.

Sample Code

* Quick and dirty tool to figure out raw Sensor API data.
* Debug code is included, but beware: it generates a HUGE file on your phone. By default debugging is turned off.
* How to do tab views without using tabs.
* How to scale data.
* How to create scrolling dotted graph.

Sensor Analyzer

Can be used to see what kind of raw data values Sensor API gives, when you move, turn and shake the device.

First bar is data_1 (RED), second bar is data_2 (GREEN) and third bar is data_3 (BLUE). At top you see max value for each data and at bottom min value. Bottom row shows current value for each.

You can reset the recorded max/min limits by pressing zero number key at any time.

Uses cases:

* Try to document Sensor API
* Experiment with movement related algorithms
* Search for limits

Usage - Keyboard shortcuts:

1 - Toggle data channel 1 on/off
2 - Toggle data channel 2 on/off
3 - Toggle data channel 3 on/off
0 - Reset collected data, start again
* - Zoom more
# - Zoom less
Right Arrow - Switch view Bars->Vector->Graph
Left Arrow - Switch view Graph->Vector->Bars
9 - Save screen snapshot on disk (debug mode only)

Initial Analysis

Sensor API callback receives following data (sample):

{'data_3': -287, 'data_2': -10, 'data_1': -31, 'sensor_id': 271003684}

* Bar 1 presents data_1: Phone is standing vertically on table, red bar goes down (negative data_1 values). Turn upsidedown, red bar goes up (positive data_1 values). Values are close to zero, when device is lying on it's side or on it's back.
* Bar 2 presents data_2: Phone is lying horizontally sideways on table on right side, green bar goes down (negative data_2 values). Turn on left side, green bar goes up (positive data_2 values). Values are close to zero, when device is standing vertically or lying on it's back.
* Bar 3 presents data_3: Phone is lying horizontally on back on table, blue bar goes down (negative data_3 values). Turn face downwards, blue bar goes up (positive data_3 values). Values are close to zero, when device is standing vertically or lying on it's side.
* Earth gravity seems to be about +/- 300.
* Static gravity "background noise" seems to be about +/- 5.
* Managed to wave the device for "1200", so values might be linear data (4G force could be within my human waving capability limits). Afterwards somehow introduced a BUG which limits max values at 680!

Use with Python v1.4.3

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