Very low sample rates

[James Cameron]

Is there a way to use a sample rate around 1Hz in Pixelpulse?

I can use the Python API and do all my own graphing, but if
Pixelpulse could do it then ... less work more fun.

https://github.com/nonolith/connectClientPython

Use case: testing health of NiMH cells, for charge and discharge.

--
James Cameron
http://quozl.linux.org.au/

[Ian Daniher]

Try adding an option to "config-sample-rate" in pixelpulse.html, something like " <option value=1>1</option>" 

With that low of a rate, you may run into issues with USB buffering - I'd try at 100 and go from there.

--

Ian

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[James Cameron]

Thanks, I tried that, see diff [1], was able to select a sample rate
of 1, but when I start sampling the values displayed on the right hand
side flickered rapidly, the trace was offset one second to the left,
and the trace was always flat, showing no history. See screenshot
[2].

References:

1. http://dev.laptop.org/~quozl/y/1WdDHK.txt

2. http://dev.laptop.org/~quozl/cee-1398321601.png

[Ian Daniher]

Hmm. I'll look into it - our UI was definitely optimized for a few orders of magnitude more data, but I would have expected it to behave better than you've described. The ability to zoom out to hour-scale is on the list for the next rev of pixelpulse.

--

Ian

[James Cameron]

Take your time. I'm using the Python API for this task now, with
external plotting using gnuplot.

On Thu, Apr 24, 2014 at 11:24:37AM -0400, Ian Daniher wrote:
> Hmm. I'll look into it - our UI was definitely optimized for a few
> orders of magnitude more data, but I would have expected it to
> behave better than you've described. The ability to zoom out to
> hour-scale is on the list for the next rev of pixelpulse.

--

James Cameron
http://quozl.linux.org.au/

[Ian Daniher]

Awesome, thanks for sharing!

James Cameron
http://quozl.linux.org.au/