[time-nuts] web presentation of data
mc235960 at gmail.com
Tue Aug 7 17:57:36 UTC 2012
Le 07/08/2012 17:56, Chris Albertson a écrit :
> On Tue, Aug 7, 2012 at 6:45 AM, Jim Lux <jimlux at earthlink.net> wrote:
>> On 8/6/12 10:43 AM, Chris Albertson wrote:
>>> On Mon, Aug 6, 2012 at 8:34 AM, Jim Lux <jimlux at earthlink.net> wrote:
>>> what would be useful is to have some sort of "plotting engine" that is a
>>>> canned webpage (or stored locally on the user/client computer) that can
>>>> ingest fairly raw data from a URL..
> So the web server is inside an Arduino? Yes can't run GNUplot there. Why
> not have the Arduino produce either Postscript or PDF? It is very easy to
> draw a graph in Postscript.
> Also everyone already has the display engine. PDF is very much like
> Postscript. but I think Postscrip in "EPS" form is easy to create inside an
One good reason for doing as little as possible in a micro-controller is
that they are often used to collect raw data with as little latency as
possible. Doing web serving on a single slowish core in that case is not
a good idea. I have a bunch of Soekris doing data collection and if I
start to do compute intensive tasks on one, it skews the timing, so I
use a completely independent one to do the web serving, with the data
collectors providing access to data via nfs which does not seen to
impact the timing much even though I can't guarantee that requests are
satisfied in otherwise idle time . I like the idea of client side
graphing. It probably exists already somewhere though I haven't checked
details - RGraph pops up with google.
Les chiens aboient, et la caravane passe.
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