You can use the "simultaneous" conversion -- which can test a large pool of
temperature chips simultaneously. Only with external power. of course.
Paul Alfille
On Mon, Apr 27, 2009 at 5:25 PM, Michael Markstaller <[email protected]> wrote:
> Alarming with the DS18B20 on Temphigh/low works fine with owfs - but I
> guess thats what Jim means -
> only after a conversion was once (manually) initiated. Also unfortunately
> regardless wether they're powered with Vdd or not. Thats IMHO a flaw with
> the chip, surely not owfs, but it would only make deeper sense if the DS18xx
> would do this by themselves and then alarm.
> So one has to initiate reading the temp anyway, which is the most
> time-consuming part and can use the measured temp directly, alarming is in
> this case, at least in this case for me quite useless ;)
> But now, its still a minor problem 'cause polling the temps is also fine
> within a few seconds..
>
> Michael
>
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