Hi Paul,

Yes, I know of this product. I have emailed them for clarification on
a couple of points (it appears that you cannot adjust the hysteresis),
but essentially this is the sort of product I need... except that it
is a room temperature sensor, and I need to measure water temp. I
certainly intend to get 1 to play with.

The DS1821 is, as Patryk says, is *almost* what I want - except that
it is either a temp sensor, *or* a thermostat, but never both at the
same time, due to the fact that the DQ pin is dual purpose, and it is
going to be a pain to flip it from one state to the other.

Using a thermocouple is the approach I favour at the moment - but that
is only because I haven't come across many alternatives.

Thanks for the help so far.



On 27 October 2011 11:38, Paul Alfille <paul.alfi...@gmail.com> wrote:
> Embedded Data Systems has exactly that in their "Environmental Sensors"
> (which is tested and supported by owfs).
>
> http://owfs.org/index.php?page=eds-enviromental-sensors
>
> Different models also can sense humidity, pressure and light.
>
> 2011/10/27 Patryk <p4tr...@o2.pl>
>>
>> Dnia 27-10-2011 o 09:55:38 Phil White <manx....@googlemail.com>
>> napisaƂ(a):
>>
>> > What I need is for a relay to automatically trigger (or, even better,
>> > for 1 of 2 relays to trigger depending on Hi/Lo) *WITHOUT* any
>> > commands or communication over the 1-wire network. 1-wire would be
>> > used simply to program the device in the first place.
>>
>> There DS1821 it's almost what you want.
>>
>> http://www.maxim-ic.com/datasheet/index.mvp/id/2794
>>
>>
>> --
>> p4trykx
>>
>>
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