Re: Outside/Inside Temperature Sensor location

[Quinten Uijldert <yahoogroups2@xxxxxxxxx>]

I think you are giving too much thought into it.  My sensors are all
located around 30cm from the wall, against the ceiling.  They are all
enclosed inside a small plastic box with air slats.  Whatever the
temperature really is, they will all be consistently on/off the mark,
and as such it does not matter.  Just apply a 'fudge' factor if you
must have an accurate (we're talking fractions of centigrades, not
centigrades) value.

For outside, make sure the sensor does not get wet, as it will damage
it.  It is also not a good idea to put it in a location where it is
directly in the sun.  I've got no sensors outside yet, so I can't
recommend anything particular, but my best guess is to stick it inside
a small plastic box which lets air in and out, but is still splash
proof.  Possibly using a small umbrella type set up.

If you want to see some pictures of my set up, have a look at
http://awooga.nl/gallery/modding/1wire/
and
http://awooga.nl/lies-damned-lies-and-statistics
for some pretty
graphs ;)

HTH

Q.

2009/1/30 Neil Wrightson <neilw@xxxxxxx>:
> Hi,
>
> I'm looking at putting some 1wire/ibutton temperature sensors in and
I'm
> wondering where is the best location for the sensors.
>
> Outside
>
> Just mounting on the side of the house or garage wall would not do due
to
> the possible heating or cooling effect of the brickwork.
>
> Even putting it a short distance i.e.300mm of the brick work. It would
still
> be affected by radiated heat.
>
> Putting it in the middle of the yard where there is no shade sounds ok
but
> then how? Sky hook? And it also would then be affected by the direct
> radiated heat from the sun, making it feel hotter than it actually is.
>
> Inside
>
> Same problem with inside, picking up the ambient room temperature
without
> being affected by the internal wall temperatures, sometimes the actual
walls
> can be substantially cooler/hotter than the air temp. Also what
height,
> again there can be quite a few degree's C difference between the
temperature
> 300mm of the floor to 300mm of the ceiling.
>
> Where is the ambient temperature?
>
> Regards,
>
> Neil Wrightson.
>
>
>
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>
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