Re: Tell me about 1-wire...

["leewild80" <muddyboots@xxxxxxxxx>]

Do you solder tail wires onto each of the temp sensor devices ?

I wonder how many could be connected into the screw terminals on one of
tho=
se boards.

--- In ukha_d@xxxxxxx, Simon Haslam <simon_haslam@...> wrote:
>
> I've been pondering this too. I think you'd mainly use them at
physically=
separate locations in the 1-wire network - where you've got several sensor=
s close together it might be overkill (especially given that the sensor
chi=
ps are so cheap). I've bought some of those 1-wire metal probes which fit
n=
icely in the pockets in my solar cylinder, and will have some flow/return
e=
tc sensors strapped to pipes - at the moment they're just pushed into
bread=
board but I think I'll shorten the leads as much as possible and then join
=
them all back to a small junction box, which itself may have 2 RJ45
sockets=
on it (perhaps using one of Stuart's boards).
>=20
> One concern is creating stars on the network (which wouldn't be the
case =
if each sensor was mounted on a twin RJ45 PCB) - hopefully it won't matter
=
where the sensor leads are only ~50cm long. For longer leads (e.g. I have
o=
ne to a DS18B20 I'm planning to install next to the weather compensation
th=
ermistor for the boiler) I'm planning to run Cat 5 with DQ "up"
to the sens=
or on blue and "back" on orange (and likewise blue/white and
oracle/white f=
or GND) - I've still not decided how to terminate that though.
>=20
> This is mostly guesswork for me ;-)
>=20
>=20
> Simon
>=20
> --- On Tue, 2/11/10, leewild80 <muddyboots@...> wrote:
>=20
> From: leewild80
> Subject: [ukha_d] Re: Tell me about 1-wire...
> To: ukha_d@xxxxxxx
> Date: Tuesday, 2 November, 2010, 15:53
>=20
> =A0 =A0 =A0 This may be a dumb question, but those PCBs with the twin
RJ4=
5 sockets - are they meant to be used one per sensor ?
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> IE each board provides a single connection point to the bus ?
>=20
> I could imagine quite a lot of these being needed say, if I wanted to
mea=
sure a number of points on my thermal store / pipework / manifold etc.
>=20
> Or have I got the wrong end of the stick...
>=20
> Cheers
>=20
> Lee
>




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