JimK
wibbled on Tuesday 05 January 2010 11:25

On Jan 4, 11:07 pm, "Dave Liquorice"
wrote:
On Mon, 4 Jan 2010 13:32:34 -0800 (PST), JimK wrote:
Would be a *lot* more useful if temp could be checked without going
outside and into barn - any suggestions (and sources) for some sort of
suitable "remote temp gauge"

Plenty of wireless thermometers about but they are generally
enviromental so might not go up to 90C.

One wire sensors are cheap and easy to use, have few and a cheap PC
and log what your heatbank is doing. Inputs outputs etc.

--
Cheers
Dave.

I had a trawl on fleabay and these for e.g. :- itemno 260531949471
look ideal - except I would need to extend the cable to abt 5m - any
comments on whether that would work or would extending cable by 500%
bring other snags into play?

Cheers
JimK

Can't be absolutely sure - that could be an analogue sender in which case
dodgy long wires may throw the reading out but it will still generally work,
or it could be digital (eg 1-wire) and not read at all if it gets unhappy,
though 1-wire specifically will easily do 5m - it can do a lot more with
decent cable.

However, for 5m, I really don't see a problem. I would deploy some screened
twisted pair cable (eg mic cable, STP network cable or any reasonable stuff
you can get your hands on). Then suck it and see. Do a calibration check
against a known thermometer and if it gets wibbly, try earthing the screen
at one end or the other.

--
Tim Watts

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