Re: [mh] Re: 1-wire temp sensors

[David H. L. Jr. <dh...@dl...>]

   Nice thread. Event though I am using 1-wire DS1822's, I learned some
things.

    Contributing my own .02.

    Linux 2.6 supports 1-wire devices directly with kernel drivers.
    Particularly for USB devices the kernel drivers conflict with
digitemp and with owfs.
    I am currently using digitemp to poll alot of 1822's
    I have found that I periodically get ridiculous temperature
readings, these are rare, and may have to do with not providing +5 to
the DS1822's. But they can be filtered out easily in code as they are
quite obviously way out of whack.

    I am trying to convert to using the Linux 2.6 1-wire drivers, but I
have not been able to find the time to get arround to working on it.

    the DS1822's are extremely cheap. I am not sure there is any means
of getting temperature readings that is nearly as cheap, as they are
cheap and easy to connect you can afford to pepper your house with them.

    Right now I am building my house - extimated completion 2025. right
now they are just flying in the breeze, but eventually I am expecting to
have several per room. I am also using radiant heat, and I plan to 
place some near floor level and some near head level, to see whick
really track what "feels" warmer. Heat from radiant floors is supposed
to "feel" warmer at lower temps - purportedly because the temperature of
your feet is more important than the temperature of you head in
determining how warm you feel. I am planning on testing that.



H Plato wrote:

>Thanks again to everyone that responded. Sounds like there are some
>good ideas out there, and I'm confident that purchasing the 1-wire
>stuff will get me the results I'm looking for. I'm going to order the
>stuff this weekend, and in a few weeks I'll be setting it up.
>
>thanks!
>
>howard
>  
>

-- 
Dave Lynch 						DLA Systems
Software Development:  				     Embedded Linux
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