[ros-users] Best way to set the parameters for the controllers (param or message?)

[Dejan Pangercic]

Ugo,

as our guru Lorenz just pointed out, please note that the earlier
attached code was actually taking 100% of CPU.
I am attaching an improved version with added sleep in the spin function.
D.

On Mon, Apr 19, 2010 at 8:18 PM, Dejan Pangercic
<dejan.pangercic at gmail.com> wrote:
> Hi Ugo,
>
> I am by no means authority but this is the way I update parameters in my nodes:
> Define node's member function, e.g.:
> /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
>  double param_;
>  void
>      updateParametersFromServer ()
>    {
>      nh_.getParam ("my_param", param_);
>    }
> and then constantly call it in that node's spin function:
>
>      updateParametersFromServer ();
>
> See also an attached example file.
>
> Furthermore, I just recently stumbled upon
> http://www.ros.org/wiki/dynamic_reconfigure which "facilitates dynamic
> node reconfiguration". However I do not really understand in how far
> is it different to conventional updating of parameters as discussed
> before. But maybe Blaise can tell here more.
>
> D.
> On Mon, Apr 19, 2010 at 6:56 PM, Ugo Cupcic <ugo at shadowrobot.com> wrote:
>> Hi,
>>
>> I'm currently setting the parameters for the controllers (PID and so on)
>> via a message (I have a subscriber which updates the values when it
>> receives the corresponding message).
>>
>> It works well, but I wanted to know what was the recommended way of
>> doing that in ROS. Is it better to do it using parameters? (But then how
>> can I  change the corresponding values when the parameters are updated?)
>>
>> Cheers,
>>
>> Ugo
>>
>> --
>> Ugo Cupcic         |  Shadow Robot Company | ugo at shadowrobot.com
>> Software Engineer      251 Liverpool Road
>> need a Hand?           London  N1 1LX       | +44 20 7700 2487
>> http://www.shadowrobot.com/hand/              @shadowrobot
>>
>>
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>>
>
>
>
> --
> MSc. Dejan Pangercic
> PhD Student/Researcher
> Computer Science IX
> Technische Universität München
> Telephone: +49 (89) 289-17780
> E-Mail: dejan.pangercic at in.tum.de
> WWW: http://ias.cs.tum.edu/people/pangercic
>



-- 
MSc. Dejan Pangercic
PhD Student/Researcher
Computer Science IX
Technische Universität München
Telephone: +49 (89) 289-17780
E-Mail: dejan.pangercic at in.tum.de
WWW: http://ias.cs.tum.edu/people/pangercic
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