Re: one wire sensors

[Too_Many_Tools <too_many_tools@xxxxxxxxx>]

On Jul 6, 3:26 pm, Marc_F_Hult <MFH...@xxxxxxxxxxxxxxxxxxxxx> wrote:
> On Fri, 06 Jul 2007 13:12:14 GMT, Jeff <dont_bug...@xxxxxx> wrote in message
>
> <Ocrji.5158$zA4.3...@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx>:
>
>
>
>
>
> >   I'd like to control ventilation and some other household functions
> >with some kind of home automation. I'd like to be able to track temp and
> >humidity in various parts of the house also. I have some knowledge of
> >programming, electronics and making circuit boards for that matter (not
> >that I want to make any circuit boards)!
>
> >   Not knowing much about this, here is what I'm thinking and please
> >feel free to tell me what is crap!
>
> >   I've seen these one wire sensors. That would seem to me the way to go
> >but I'm unsure how this interfaces with the automation. How does this
> >work? Can this be interfaced with any of the STAMP modules that are
> >available?
>
> >   The way I picture this is that one wire sensors feed the STAMP (or
> >other automation control) and that is interfaced to a home PC. Is that
> >about right or are these things best done otherwise?
>
> >   How is the programming handled? I've seen mention of Ada and C on the
> >STAMP level.
>
> >   Jeff
>
> I'd be wary of _depending_ on Dallas / Maxim 1-wire for new applications.
>
> The Applications Engineer for the 1-Wire and iButton Groups wrote me : " It
> is correct that the DS2890 was recently assigned a NRFND status.  Our
> customer base on this product is very small and ongoing R&D investment is
> large and prohibitive to convert the 6" wafer based design to an 8"
> wafer equivalent that is necessary to continue production in our wafer fabs.
> Our EOL strategy for this device is to build a supply of product that will
> provide a 5yr to 7yr supply to existing customers. "
>
> Nonetheless, I've developed a family of pcboards that provide signal
> conditioning, power supply and analog, digital, and 1-wire connectivity for
> what I call THOL (Temperature, Humidity, Occupancy and Lighting). They are
> designed to fit in single gang switch box for wall or ceiling mounting, are
> connected to a multiplexor at one or more central locations for logging via
> DMX, 1-wire and PC-PCI 16-bit AD converters.  I expect the first boards back
> in a week or so. If I like the  prototypes, I may put together a large order.
>
> Most HA systems are not very good at data logging (checking, interpreting,
> representing, and storing data). This system is designed to address that need
> in a robust and redundant way.
>
> I'll post more later to my web site ... Marc
>
> Marc_F_Hultwww.ECOntrol.org- Hide quoted text -
>
> - Show quoted text -

So what is the alternative if the 1-wire is history?

TMT