Re: Re : Re: accelerometer calibration

[W. B. Kranendonk]

--- On Sat, 12/25/10, Timo Juhani Lindfors timo.lindf...@iki.fi wrote:
 W. B. Kranendonk wankelwan...@yahoo.com writes:
  I found it after searching for accelerometer-dump, but (the FR)
 Just capture the data on FR but run it on your PC. Like
 
 li...@sauna$ ssh neo cat /dev/accelerometer-top |
 accelerometer-dump
I get that far on my PC :-) 

  Any idea what to do about the diversion? I bought that
 FR second
  hand, and it has had this feature ever since I got
 it.
 
 I guess you could fix it by software but such a fix is
 probably not
 going to be accepted upstream since it is so ugly :-)
 
My coding skills are about the right level for compiling accelerometer-dump.c, 
so I do not think anything I fix is going to get accepted upstream anytime soon 
;-)

Coming back to the initial question, can those accelerometers be calibrated or 
is it a black box that emits (timestamps and) coordinates?


Boudewijn


  

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Re: Re : Re: accelerometer calibration

[Timo Juhani Lindfors]

W. B. Kranendonk wankelwan...@yahoo.com writes:
 See attachment.

li...@ginger:~$ accelerometer-dump  event4.log | head | cut -d ';' -f2-|tr ';' 
' '
x y z
108 36 900
144 36 900
126 36 900
126 36 882
144 36 900
126 36 900
126 18 900
126 36 900
126 36 882
li...@ginger:~$ accelerometer-dump  /dev/accelerometer-top | head | cut -d ';' 
-f2-|tr ';' ' '
x y z
36 0 990
54 0 972
36 0 990
36 18 990
18 18 1008
36 18 990
36 18 1008
36 18 990
36 0 1008
li...@ginger:~$ accelerometer-dump  /dev/accelerometer-bottom | head | cut -d 
';' -f2-|tr ';' ' '
x y z
54 54 972
36 54 954
54 72 972
54 72 954
54 72 972
54 54 972
54 72 954
54 54 972
54 72 972

If I look at the top accelerometer and lift the bottom of the phone a
little and tilt it to the right I get the same readings as you.

-Timo


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Re: Re : Re: accelerometer calibration

[W. B. Kranendonk]

--- On Sat, 12/25/10, Timo Juhani Lindfors timo.lindf...@iki.fi wrote:
 li...@ginger:~$ accelerometer-dump  event4.log | head |
 cut -d ';' -f2-|tr ';' ' '
 x y z
 108 36 900
 144 36 900
 126 36 900
 li...@ginger:~$ accelerometer-dump 
 /dev/accelerometer-top | head | cut -d ';' -f2-|tr ';' ' '
 x y z
 36 0 990
 54 0 972
 36 0 990
 36 18 990
 18 18 1008
 36 18 990
 If I look at the top accelerometer and lift the bottom of
 the phone a
 little and tilt it to the right I get the same readings as
 you.

Would that mean that (one of) the meter(s) is connected at an angle? Are they 
not calibrated in software? 

Is the accelerometer-dump standalone, and do you have a binary version 
available? 

Thanks so far!

Regards,

Boudewijn


  

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Re: Re : Re: accelerometer calibration

[Timo Juhani Lindfors]

W. B. Kranendonk wankelwan...@yahoo.com writes:
 Would that mean that (one of) the meter(s) is connected at an angle?
 Are they not calibrated in software?

top and bottom accelerometers are oriented differently anyway.

 Is the accelerometer-dump standalone, and do you have a binary version 
 available? 

http://iki.fi/lindi/openmoko/accelerometer-dump.c



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Re: Re : Re: accelerometer calibration

[W. B. Kranendonk]

--- On Sat, 12/25/10, Timo Juhani Lindfors timo.lindf...@iki.fi wrote:
 W. B. Kranendonk wankelwan...@yahoo.com
 writes:
  Would that mean that (one of) the meter(s) is
 connected at an angle?
  Are they not calibrated in software?
 
 top and bottom accelerometers are oriented differently
 anyway.
Yes, now you say it I recall reading about it. I actually meant: could it be 
that it is installed at an incorrect angle, i.e. not perpendicular or paralell 
to the case, but slanted.

  Is the accelerometer-dump standalone, and do you have
 a binary version available? 
 
 http://iki.fi/lindi/openmoko/accelerometer-dump.c
I found it after searching for accelerometer-dump, but (the FR) didn't have gcc 
installed and don't know yet which packages to install to make it useful. At 
least a reason now to dive into figuring that out :-)

Any idea what to do about the diversion? I bought that FR second hand, and it 
has had this feature ever since I got it.

Regards,

Boudewijn


  

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Re: Re : Re: accelerometer calibration

[Timo Juhani Lindfors]

W. B. Kranendonk wankelwan...@yahoo.com writes:
 I found it after searching for accelerometer-dump, but (the FR)
 didn't have gcc installed and don't know yet which packages to
 install to make it useful. At least a reason now to dive into
 figuring that out :-)

Just capture the data on FR but run it on your PC. Like

li...@sauna$ ssh neo cat /dev/accelerometer-top | accelerometer-dump

 Any idea what to do about the diversion? I bought that FR second
 hand, and it has had this feature ever since I got it.

I guess you could fix it by software but such a fix is probably not
going to be accepted upstream since it is so ugly :-)


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Re: Re : Re: accelerometer calibration

[W. B. Kranendonk]

--- On Sat, 12/25/10, Iain B. Findleton ifindle...@videotron.ca wrote:
 The output from
 the chip is quite noisy. 
The problem is not that the signal is not reliable: it is. It is just that it 
is off by a few degrees. 

 There is a script I wrote in TCL
 on the
 SourceForge web site under the fltkwish project page. It
 may give you
 some ideas about that can be done. In my experience, the
 results vary
 depending on which of the chips you use.
I have used the (a?) waterpas before, when there was such a program in the SHR 
repositories. I just had a shot at gravity, but there are some missing 
dependencies. 

It complains about libtcl8.4.so:
# gravity 
fltkwish: error while loading shared libraries: libtcl8.4.so: cannot open 
shared object file: No such file or directory

I tcl, fltk and fltkwish installed and libtcl8.5.so.0 is available
I symlinked it to libtcl8.4.so:
 # ls -latr /usr/lib/libtcl8.*
-r-xr-xr-x1 root root663504 May 29  2010 /usr/lib/libtcl8.5.so.0
lrwxrwxrwx1 root root14 Dec 23 20:17 /usr/lib/libtcl8.4.so 
- libtcl8.5.so.0

Now it aborts with just that:
# gravity 
Aborted

Perhaps another time :-)

 
 Note that on the iPhone, some versions of which used the
 same chip, you
 only get access to the 100/sec samples, 
On a sidenote: long live closed platforms

 The other issues is there was at one time some confusion
 about how the
 driver reported through the event mechanism. I forget the
 details now,
 but working code depended on how up to date your kernel
 was. If you have
 a kernel of recent vintage, should not be an issue.
It's the latest SHR:
# uname -a
Linux om-gta02 2.6.34.7 #1 Sun Dec 5 23:10:39 CET 2010 armv4tl GNU/Linux

I wonder (..doubt..) if the issue is in the software, because it has been like 
this over the last half year or so, with different distro's and no problems on 
the other FR with the same version of a distro.

Thanks for the insight anyway!

Boudewijn


  

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Re: Re : Re: accelerometer calibration

[W. B. Kranendonk]

 Le 23 déc. 2010 10:11, Timo Juhani Lindfors timo.lindf...@iki.fi 
 a écrit :
 W. B. Kranendonk writes: 
   One of my FRs is dizzy: the accelerometers are off. 
  Can you send a sample of the accelerometer data? (Preferably in
  the binary format that you can read from /dev/input/) 

 On Thu, 12/23/10, sylvain.p...@gmail.com sylvain.p...@gmail.com wrote:
 With a command line like this :
   cat /dev/input/event4 | od -c (or -b or -d dont remember and i am
  not on my laptop)
Thanks for the hint, it would have been my next question I suppose ;-)

I used od -b, which gives octal byte representation: 

0017720  230   ] 022   M 371   H 005  \0 003  \0 001  \0 022  \0  \0  \0
0017740  230   ] 022   M  \0   I 005  \0  \0  \0  \0  \0  \0  \0  \0  \0
0017760  230   ] 022   M 220   m 005  \0 003  \0  \0  \0   ~  \0  \0  \0
002  230   ] 022   M 260   m 005  \0  \0  \0  \0  \0  \0  \0  \0  \0
0020020  230   ] 022   M 035 267 005  \0 003  \0 001  \0   $  \0  \0  \0
0020040  230   ] 022   M   K 267 005  \0  \0  \0  \0  \0  \0  \0  \0  \0
0020060  230   ] 022   M 234  \0 006  \0 003  \0 001  \0 022  \0  \0  \0
0020100  230   ] 022   M 305  \0 006  \0  \0  \0  \0  \0  \0  \0  \0  \0
0020120  230   ] 022   M 234 223 006  \0 003  \0 001  \0   $  \0  \0  \0
0020140  230   ] 022   M 273 223 006  \0 003  \0 002  \0 226 003  \0  \0
0020160  230   ] 022   M 277 223 006  \0  \0  \0  \0  \0  \0  \0  \0  \0
0020200  230   ] 022   M 310 270 006  \0 003  \0 002  \0 204 003  \0  \0
0020220  230   ] 022   M 330 270 006  \0  \0  \0  \0  \0  \0  \0  \0  \0
0020240  230   ] 022   M 231 335 006  \0 003  \0  \0  \0   l  \0  \0  \0
0020260  230   ] 022   M 244 335 006  \0 003  \0 001  \0 022  \0  \0  \0
0020300  230   ] 022   M 254 335 006  \0  \0  \0  \0  \0  \0  \0  \0  \0
0020320  230   ] 022   M 352 001  \a  \0 003  \0  \0  \0   ~  \0  \0  \0
0020340  230   ] 022   M 031 002  \a  \0 003  \0 001  \0   $  \0  \0  \0
0020360  230   ] 022   M 037 002  \a  \0  \0  \0  \0  \0  \0  \0  \0  \0
0020400  230   ] 022   M   4   p  \a  \0 003  \0 001  \0 022  \0  \0  \0
0020420  230   ] 022   M   b   p  \a  \0  \0  \0  \0  \0  \0  \0  \0  \0



Is that useful? This is while the FR is lying flat on its back. I haven't 
compared it to output from the other FR yet.

Best regards,

Boudewijn



  

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Re: Re : Re: accelerometer calibration

[Timo Juhani Lindfors]

W. B. Kranendonk wankelwan...@yahoo.com writes:
 Is that useful? This is while the FR is lying flat on its back. I
 haven't compared it to output from the other FR yet.

Raw binary output would be a lot easier to parse.

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Re: Re : Re: accelerometer calibration

[W. B. Kranendonk]

--- On Sat, 12/25/10, Timo Juhani Lindfors timo.lindf...@iki.fi wrote:
 W. B. Kranendonk wankelwan...@yahoo.com
 writes:
  Is that useful? 
 Raw binary output would be a lot easier to parse.
 
Lying on its back again, cat /dev/input/event4  event4.log

See attachment.





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Re : Re: accelerometer calibration

[sylvain.pare]

With a command line like this :cat /dev/input/event4 | od -c (or -b or -d dont remember and i am not on my laptop)Le 23 déc. 2010 10:11, Timo Juhani Lindfors timo.lindf...@iki.fi a écrit: "W. B. Kranendonk"  writes:
> One of my FRs is dizzy: the accelerometers are off. 

Can you send a sample of the accelerometer data? (Preferably in the
binary format that you can read from /dev/input/)





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