### On axes directions

When in a car we place the board so that x axes is directed forth, z axis is vertical.

## stribog data samples

Here are some data samples produced by stribog the attitude sensor. These files can be found in 25v6-stribog.data.tar.bz2 when we succeed to upload it.

### 16 Apr 2006

Car generator produces specific magnetic pulses. we looked for a place where this noise is minimal. so we placed our board

1. under the front window of the car (files 16v6/*front*.log)
2. in the center the floor of the car (files 16v6/*bottom*.log)
3. under the rear window of the car (files 16v6/*back*.log)

The engine worked, but the car didn't move.

The board run magex, so we can see 800Hz magnetic field samples. the data can be extracted into text with magexpon.

Two files has been logged for each position: with the sound system on (*verbous.log) and off (*silent.log). we couldn't find any difference in the noise, even under the rear window, where the speakers are situated.

In the last case (under the back window) the noise is quite low. it may be said the car makes no noise at all. unfortunately, there appear significant vibrations when she runs.

Some graphs made with gnuplot follow (sample frequency 798.4Hz assumed):

### 21 Apr 2006

magex shows 50Hz cycles in an electrified building (the file is 0magex-conloq.log).

The cycles are evidently not sinusoidal:

5conloq.log is accelerometers calibration: I found maximum and minimum for every axis.

### 22 May 2006

The board was mounted under the back chair. on the roof we placed a GPS antenna. the GPS receiver is a Garmin GPS-25. we run multa on stribog, connected the output of the receiver to PORT0 and logged output of the board with conloq. 22v6/1conloq.log is the result. there are a lot of more data, but it is not so easy to upload all those hundreds of MBytes.

The data are converted to text with expon.