Re: 1 wire temperature monitoring

[Ben McCormack <yahoogroup@xxxxxxxxxxxxxxxxxxx>]

Nigel

Thanks for this.

Unfortunately I am using cbus for all of the lighting so I can't=20=20
butcher the sockets.

I assume you want to be measuring the temperature in a similar=20=20
position to where you would personally 'feel' the temp. This is why I=20=20
am thinking next to light switches is not a bad position.

There are some other options for ready made sensors

http://www.homechip.com/catalog/product_info.php?cPath=3D27&products_id=3D7=
2
=A39.49 each
and
http://www.homechip.com/catalog/product_info.php?cPath=3D27&products_id=3D1=
10
=A38.70 each

Ben



On 4 Jan 2009, at  11:04, Nigel Giddings wrote:

> Hi Ben, and others who have responded,
>
> I have uploaded a couple of files to the 'files area'.
>
> http://groups.yahoo.com/group/ukha_d/files/Corbenic/
>
> One is a picture of a typical light switch in my house. All the=20=20
> light switches are double gang with either 4 retractive switches
or=20=20
> 3 and a 'hole' for the DS1820. The picture is of a 3 gang plate
with=20=20
> the hole in the 'Study'. Each room has one light switch plate with
a=20=20
> ds1820 fitted. More ds1820s are placed in hidden locations, or as
in=20=20
> the basement just hanging from the ceiling...
>
> I did not mount the ds1820's in any form of grommet they are
just=20=20
> floating there using the tension of the CAT5e to hold them in=20=20
> position from behind. The ds1820s are round with a flat side but=20=20
> this does not notice (at least to my eyes).
>
> The issues here are: is the wall plate acting as a heat sink and=20=20
> reducing the response of the device? Optimum thermostat position
is=20=20
> not typically the same place as the light switch, and of course=20=20
> personal choice as far as aesthetics.
>
> The second file is a PDF showing the position of some of the
ds1820s=20=20
> and the cable run for the basement and Gnd floor. As I mentioned
I=20=20
> have used CAT5e. I have wired in such a way that the devices are=20=20
> across the wires and all wiring is in series. You will also see=20=20
> reference to 8 way connector blocks with screws (shown as red
boxes=20=20
> on the PDF) which are the house alarm variety from Maplin. This
are=20=20
> a bit of a PITA to install, lots of wiring, so would probably use
a=20=20
> punch down version if I were doing it again.
>
> The idea is that the GND connection comes into the Junction Box
on=20=20
> the Green and Brown pairs, goes up the branch on the Green pair
and=20=20
> returns on the Brown pair to the ongoing Green and Brown pairs
to=20=20
> the next Junction Box. That way I do not end up with long spurs,
all=20=20
> the wiring is in series. I do similar with the Vdd and DQ lines,=20=20
> thereby not relying on parasitic power. Hope this makes sense.
>
> The ds1820s are wired as shown in the PDF and I use heat shrink
to=20=20
> isolate the legs with an overall wrap to give it some strength.=20=20
> Because the holes in the wall plates are just big enough for the=20=20
> ds1820s the overall heat shrink stops the thermostat pulling
through=20=20
> the hole.
>
> You can see I have noted the serial numbers on the drawings so
that=20=20
> they can be easily identified during setup in Homeseer, I use
the=20=20
> mcsTemperature plugin.
>
> Any more questions just shout.
>
> Nigel
>
> -----Original Message-----
> From: ukha_d@xxxxxxx [mailto:ukha_d@xxxxxxx] On=20=20
> Behalf Of Ben McCormack
> Sent: 03 January 2009 20:08
> To: ukha_d@xxxxxxx
> Subject: Re: [ukha_d] 1 wire temperature monitoring
>
> Nigel
>
> Thanks for sharing this.
>
> Our house currently has many holes in walls and ceilings and I have
> been thinking about 1-wire for temperature monitoring. This hub seems
> perfect.
>
> I do have a couple of questions
>
> How do you mount the sensors around the house? Has anyone found
> anything easy to use?
>
> I assume I you use Cat5 cable to loop into and out of each sensor. I
> guess you 'splice' the sensor onto the Cat5 cable at a suitable point?
>
> Ben
>
> On 3 Jan 2009, at 15:33, Nigel Giddings wrote:
>
> > Hi,
> >
> > I have been looking at extending my 1-wire temperature monitoring
in
> > the house. 1-wire was never designed for long cable lengths and
> > begins to suffer reflections if the cables get too long... well I
> > have reached that point.
> >
> > I want to monitor some of the H/W pipes to things like the
showers
> > and baths, to trigger towel rail heating and also temperatures on
> > the heat exchanger to see if it actually exchanges heat as well
as a
> > couple more room and equipment rack probes....
> >
> > However, I have run up against the cable length issue.
> >
> > What I have found is a Hub that effectively separates three daisy
> > chains of sensors to enable three lengths of cable with sensors.
> >
> > http://www.homechip.com/catalog/product_info.php?cPath=3D22&products_id=
=3D109=20
>  <http://www.homechip.com/catalog/product_info.php?cPath=3D22&products_id=
=3D109=20
> >
> >
> > What is also nice about this is that it connects to the PC via
> > Ethernet so you can remotely position it wherever you have
Ethernet
> > connectivity, even over the internet....
> >
> > I intend to use with Homeseer with a plug-in called Ultra1wire to
do
> > all the leg work and place the data into virtual devices in
Homeseer
> > which can then be used however I want.
> >
> > http://forums.homeseer.com/forumdisplay.php?f=3D854
<http://forums.home=
seer.com/forumdisplay.php?f=3D854=20
> > ($29.95)
> >
> > They are in stock, spoke with them today, and will probably order
1
> > on Monday (=A399 + VAT + P&P =A37)
> >
> > Just thought I would pass it by the list to see if any other
> > alternatives exist....
> >
> > Nigel
> >
> > [Non-text portions of this message have been removed]
> >
> >
> >
>
> [Non-text portions of this message have been removed]
>
> [Non-text portions of this message have been removed]
>
>
>=20



[Non-text portions of this message have been removed]


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