That sounds about right to me.
On Wed, Oct 1, 2014 at 1:44 PM, Roberto Spadim <robe...@spadim.com.br>
wrote:
> check if i'm wrong, <10ms per scratchpad
>
> 2014-10-01 16:38 GMT-03:00 Colin Reese <colin.re...@gmail.com>:
> > Read scratchpad is pretty darn fast. I'd have to go back to my notes to
> see
> > exactly how fast. If I remember correctly, the convert will take
> something
> > like 1mA per device during conversion.
> >
> > You can also take turns with bunches of devices, reading a smaller
> subset so
> > as to optimize load on the bus. I started a thread on this previously.
> You
> > can issue a few tens of converts in succession, then go back and read
> > scratchpads of the devices you like.
> >
> > C
> >
> > On Wed, Oct 1, 2014 at 12:14 PM, Roberto Spadim <robe...@spadim.com.br>
> > wrote:
> >>
> >> here using usb-serial isnt a problem
> >> but if i remember some linux usb-serial drivers have a limit of
> >> howmany devices/computer could be used
> >> maybe it' near to 16usd/computer (per linux operational system)
> >>
> >> 2014-10-01 16:13 GMT-03:00 Roberto Spadim <robe...@spadim.com.br>:
> >> > :) probably yes
> >> > but any problem including more buses devices?
> >> >
> >> > 2014-10-01 15:57 GMT-03:00 Jerry Scharf
> >> > <sch...@lagunawayconsulting.com>:
> >> >> Roberto,
> >> >>
> >> >> I was planning on a large power supply and using simultaneous mode,
> but
> >> >> from my prior experience we still wouldn't be able to poll the
> >> >> temperature of all the devices very quickly. Thus the need for more
> >> >> buses to run in parallel.
> >> >>
> >> >> jerry
> >> >>
> >> >> On 10/01/2014 11:53 AM, Roberto Spadim wrote:
> >> >>> hummm you need to measure, or check a alarm condition?
> >> >>>
> >> >>> with 300 using alarm condition is possible only alarmmed sensors
> will
> >> >>> be reported at bus, it's not temperature convertion it's only alarm
> >> >>> information (alarm on/off)
> >> >>>
> >> >>> measuring temperature you should use (i don't remember the owfs file
> >> >>> name) a option to convert all sensors at same time, but ensure a
> good
> >> >>> power supply and after read one by one without convert temperature
> >> >>> (the same owfs file do this)
> >> >>>
> >> >>> 2014-10-01 15:04 GMT-03:00 Jerry Scharf
> >> >>> <sch...@lagunawayconsulting.com>:
> >> >>>> Hi,
> >> >>>>
> >> >>>> I am looking at using 18b20s to measure some load resistors and a
> >> >>>> couple
> >> >>>> other things. This is for a large bank of unit under test. The
> thing
> >> >>>> is
> >> >>>> that there are 300 load resistors plus 20-30 other channels to
> track.
> >> >>>> Then again, if we do a second monitor point, that's another 300
> >> >>>> sensors.
> >> >>>> >From my experience with 30 sensors, having 300 is going to take a
> >> >>>> number
> >> >>>> of buses to be able to poll in finite time.
> >> >>>>
> >> >>>> How many buses make sense? What type of bus masters should I
> choose?
> >> >>>> We
> >> >>>> will have some type of monitor computer, probably a linux box.
> >> >>>>
> >> >>>> thanks in advance,
> >> >>>> jerry
> >> >>>>
> >> >>>>
> >> >>>>
> >> >>>>
> ------------------------------------------------------------------------------
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> >> >>>
> >> >>
> >> >>
> >> >>
> >> >>
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> >> >
> >> >
> >> > --
> >> > Roberto Spadim
> >> > SPAEmpresarial
> >> > Eng. Automação e Controle
> >>
> >>
> >>
> >> --
> >> Roberto Spadim
> >> SPAEmpresarial
> >> Eng. Automação e Controle
> >>
> >>
> >>
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> >
> >
> >
> >
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>
> --
> Roberto Spadim
> SPAEmpresarial
> Eng. Automação e Controle
>
>
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