Re: Tell me about 1-wire...

["leewild80" <muddyboots@xxxxxxxxx>]

Simon & Ben - many thanks, that's great info.

I hadn't thought about looping back via spare pairs of the cat5 - sounds
ob=
vious when you mention it !

Lots to digest & things to read.

Thanks again
Lee

--- In ukha_d@xxxxxxx, Simon Haslam <simon_haslam@...> wrote:
>
> Lee
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> I'm working on a similar thing - primarily using 1-wire for monitoring
an=
d managing my central heating.
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> I spoke to HomeChip and they convinced me that it was better to go for
th=
e LinkUSB 1-wire controller (http://www.homechip.com/catalog/product_info.p=
hp?cPath=3D22&products_id=3D158) as it's supposed to be more reliable
due t=
o the way serial to USB is implemented, plus some network reliability
enhan=
cements. The HomeChip chap was very helpful so I've no reason to think
this=
was just a =C2=A310 up-sell. I've been using that for about a month withou=
t problems - it was recognised fine by Ubuntu linux. At the moment I'm
usin=
g Digitemp to read the sensors and RRDtool to graph them, though intend to
=
move to owfs.
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> I'm using Clipsal pink CAT5 cable for my 1-wire network and will
probably=
use RJ45 plugs (rather than RJ11/12) as they seem to be more common even t=
hough they are bulkier. From the start I have used the 5V supply from the
L=
inkUSB too, rather than relying on parasitic power. I did increase the
poll=
time (up to 1.2s I think) which reduced the number of failed readings.
>=20
> Last week I've just received an I/O board (http://www.hobby-boards.com/ca=
talog/product_info.php?products_id=3D1554) which I'm planning to use to
con=
trol 24V actuators on a 7 port manifold connected to the radiators.
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> I immediately found the solar cylinder temperature measurements very
usef=
ul - in fact I've just re-plumbed the outlets to try to reduce
thermo-sypho=
ning and standing heat losses.
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> You say you've got 3 networks due to the natural layout. Though not
recom=
mended, a star topology may work if there aren't too many devices, I don't
=
know. Otherwise have you considered running the data/ground
"back" through =
a spare pair so that you don't need a hub? Then your network becomes one
lo=
ng one that goes "up and down" 3 legs (if you see what I mean!).
That would=
save the hub and so should reduce complexity. There's also a paper on Maxi=
m's site about designing long 1-wire networks, which I take to also mean
wh=
at to do to get shorter networks to run most reliably.
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> Good luck!
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> Simon
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> --- On Tue, 26/10/10, ben_mccormack2000 <yahoogroup@...> wrote:
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> From: ben_mccormack2000 <yahoogroup@...>
> Subject: [ukha_d] Re: Tell me about 1-wire...
> To: ukha_d@xxxxxxx
> Date: Tuesday, 26 October, 2010, 16:02
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> =C2=A0
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>       Couple of pointers that may help. I have a load of 1-wire is the
ho=
use but never managed to wire it all up!!
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> http://www.klein.com/thermd/ - Guy
doing similar to you and using linux b=
ackend
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> I use the HA7NET for the hub.
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> If you also search for my mails I asked similar questions about 1-2
years=
ago
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> Ben
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> --- In ukha_d@xxxxxxx, "leewild80" <muddyboots@>
wrote:
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> >
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> > Afternoon all
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> >=20
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> > Am trying to read up about the use of 1-wire networks &
sensors for tem=
perature monitoring.
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> >=20
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> > Tried to search this list, but as someone has the text
"1-wire" embedde=
d at the end of all their posts, I couldn't see wood for't trees... :)
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> >=20
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> > I'd quite like to monitor temps in several places, for example:
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> > 1) At various points on my thermal store & associated
pipework
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> > 2) On my UFH manifold, eg F&R temps to the manifold itself
and also to =
each zone
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> > 3) Same as 2) but on the manifold I'll soon be installing to run
all my=
rads off.
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> >=20
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> > Each of the above are in quite separate locations in the house,
so I fo=
rsee having 3 separate networks, one to each area, running back to a PC.
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> >=20
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> > I have a Linux PC that's running most of the time for file
storage and =
intend to use OWFS to get the data back from the sensors. It has USB ports
=
but no older style serial port.
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> >=20
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> > I guess what I'm wanting to know is:
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> > 1) How can I cater for the 3 separate networks ? I have read
about 1-wi=
re hubs but haven't yet seen where I could buy these from. I guess I can't
=
just "star" 3 long legs together, or can I ?
>=20
> > 2) I presume I can use Cat5 UTP to run the networks, and hang the
senso=
rs off this ? Route the cat5 around all the sensor locations and attach
the=
m to it via short tails ?
>=20
> > 3) Would I need to provide additional power to the networks to
power th=
e sensors, or is there some kind of hub device that will do this for me ?
>=20
> > 4) Will the DS9490R USB interface from Homechip be all I need to
hook u=
p to my PC and be useable with OWFS ?
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> > (http://www.homechip.com/catalog/product_info.php?cPath=3D22&products_i=
d=3D30)
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> >=20
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> > If there's a handy guide that tells me all of this, feel free to
point =
me at it !
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> > Many thanks
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> > Lee
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> >
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> [Non-text portions of this message have been removed]
>




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