Re: Re: Simat 1 wire Hubs

[Jon Payne <jgpayne@xxxxxxxxxxxxxx>]

Hi Frank,

See:
http://www.maxim-ic.com/products/ibutton/ibuttons/
http://www.maxim-ic.com/products/ibutton/ibuttons/thermochron.cfm
http://www.maxim-ic.com/quick_view2.cfm/qv_pk/3246

But essentially a Thermocron is 1-wire temperature logger containing a
battery in a little metal can. It is connected to the 1-wire network to
'mission' it (start/stop times of the mission and how often to record the
temperature in units of a minute), then placed somewhere to record up to
4096 temperature samples, connect it back on to the 1-wire network to
retrieve the data and remission it.

cheers,
jon

----- Original Message ----
> From: Frank Mc Alinden <frankmc@xxxxxxx>
> To: ukha_d@xxxxxxx
> Sent: Monday, 19 November, 2007 10:04:03 AM
> Subject: Re: [ukha_d] Re: Simat 1 wire Hubs
>
> Hi Jon
>
> Thanks for the feedback......
>
> Good to hear its all working out good for you......
>
> What are Thermocron's...????
>
> Frank
>
>
> ----- Original Message -----
> From: "Jon Payne"
> To:
> Sent: Friday, November 16, 2007 1:09 AM
> Subject: Re: [ukha_d] Re: Simat 1 wire Hubs
>
>
> > (wow, just found this in my 'drafts' folder, obviously been
sitting there
> > a while so apologies for those who wonder what this is about!)
> >
> > Hi Frank,
> >
> > I made this change (start temperature conversion of all devices
on a
> > branch and then go back later and read the temperature) and it
has reduced
> > the time to take temperature readings.
> >
> > Unfortunately although all my temperature sensors are DS18B20's,
some are
> > family code 0x10 and some are family code 0x28!
> > Only the 0x10's work with the SkipRrom/ConvertT method, so I have
to
> > explicitely select and ConvertT on the 0x28 devices.Even the
combination
> > of this, accessing all devices on a branch together and then
going back
> > later to actually read the temperatures saves quite a bit of time
and more
> > improtantly doesn't tie up the bus for anywhere near as long
(because the
> > bus can be used whilst the temperature conversion's are being
done).
> >
> > I've also added support for Louis Swart(sp?) LCDs (with xAP OSD)
and
> > reading of Thermocron's...
> >
> > Cheers,
> > Jon
> >
> >
> > ----- Original Message ----
> > From: Frank Mc Alinden
> > To: ukha_d@xxxxxxx
> > Sent: Wednesday, 23 May, 2007 9:31:42 AM
> > Subject: Re: [ukha_d] Re: Simat 1 wire Hubs
> >
> >
> > Hi Jon
> >
> >> I'm going to look at optimising the temperature gathering now
by grouping
> >> sensors by path(location on branches), which will also apply
to polled
> >> sensors in general, and by starting >temperature
conversion off
> >> simultaneously (which I've only just realised can be done)
for all
> >> >sensors on that path, then fetching their readings
> >
> > Let us know how this goes ....
> >
> > Frank
> > ----- Original Message -----
> > From: "Jon Payne"
> > To:
> > Sent: Wednesday, May 23, 2007 5:21 PM
> > Subject: Re: [ukha_d] Re: Simat 1 wire Hubs
> >
> >
> >> Great to know others are using 1-wire on UKHA!
> >>
> >> I have now speeded up my network scanning a little by using
the DS2409
> >> SmartOn feature - this lets you determine whether there are
/any/ devices
> >> on a branch without having to actually scan it which
obviously saves time
> >> if a branch is unused or used for touch contact ibutton
applications.
> >>
> >> I'm going to look at optimising the temperature gathering now
by grouping
> >> sensors by path (location on branches), which will also apply
to polled
> >> sensors in general, and by starting temperature conversion
off
> >> simultaneously (which I've only just realised can be done)
for all
> >> sensors
> >> on that path, then fetching their readings.
> >>
> >> cheers,
> >> jon
> >>
> >>
> >> ----- Original Message ----
> >> From: Frank Mc Alinden
> >> To: ukha_d@xxxxxxx
> >> Sent: Wednesday, 23 May, 2007 7:49:12 AM
> >> Subject: Re: [ukha_d] Re: Simat 1 wire Hubs
> >>
> >>
> >> Hi Mark / Jon
> >>
> >>> Sort of - as I understand it, it does a startup scan to
detect new
> >>> devices and adds them to the database of connected
devices. It will
> >>> then scan for devices in the database so if a device has
been
> >>> connected at any startup it should then be scanned for.
However, I
> >>> think the new hub code breaks this in that the hub branch
number is
> >>> remembered at startup and the devices are only searched
for on that
> >>> branch.
> >>
> >> That appears to be the case from my observations as well....
> >>
> >>> Nice to see some 1-wire discussion here, I'm just getting
into it and
> >>> going through the opnode sorce code has helped a lot but
it's good to
> >>> hear of other ways of doing things.
> >>
> >> Keep us posted on your progress
> >>
> >> Frank
> >>
> >>
> >>
> >>
> >>
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
>
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> http://docs.yahoo.com/info/terms/
>