RE: failsafe data collection, was Last Night in London?

["Mick Furlong" <dorsai@xxxxxxx>]

Yup looked at these and was trying to figure out the downside...cost is
comparable to other temp devices and they store the data locally plus dont
need external power to do it...am I missing something?

Mick

> -----Original Message-----
> From: Stuart Grimshaw [mailto:stuart@xxxxxxx]
> Sent: 24 June 2001 11:45
> To: ukha_d@xxxxxxx
> Subject: Re: failsafe data collection, was [ukha_d] Last Night in
> London?
>
>
> You could use something like the DS1921L-F5x, this will store up to
2048
> consecutive temperatures in ROM, it also comes with 4096bits of
> RAM, and has
> an RTC. It will even continue to record temperatures when power is
> disconnected. It's applications suggested are things like recording
the
> temperature of something in transit.
>
> On Sunday 24 June 2001 11:15 am, you wrote:
> > sort of.  i want the houses status to be distributed around the
house in
> > case of failure.  Each sensor has its own nvram chip so whenever
you
> > collect a temperature the local storage is updated with the info.
 A
> > collector thread runs at a lower priority to run this data off
into your
> > historical database.  An example of why this might be useful is
after a
> > system crash (house power failure).  The power is out for 20
minutes on
> > reboot each temp sensor is queried for current status.  Given
> all lighting
> > heating has been off the temperatures recovered might not be
appropriate
> > given the current status outside.  Alternatively you might lose
the
> > historical database so its impossible for the system to determine
the
> > historical time series for each room.  In this case you can
> fall back onto
> > the nvram chips to give you a clue to the current status of the
> house. The
> > primary function of each nvram is to associate addresses to
> each sensor and
> > provide limited historical data about the environ in which its
located
> > should there be problems with the control units.
> >
> > k.
> >
> > -----Original Message-----
> > From: Stuart Grimshaw [mailto:stuart@xxxxxxx]
> > Sent: Sunday, June 24, 2001 11:10 AM
> > To: ukha_d@xxxxxxx
> > Subject: Re: [ukha_d] Last Night in London?
> >
> > On Sunday 24 June 2001 10:53 am, you wrote:
> > > Stuart,
> > >
> > > device will switch it on and off.  XML on the nvram chips
> detailing its
> > > location can be overlayed on top of the vrml describing the
> layout of the
> > > house/flat. The NVRAM has to be updated by the controller
> because I cant
> > > afford the expense of a TINI in each sensor unit but I want
> to have the
> >
> > So the NVRAM data would be used for other devices that don't
> have access to
> > the db on the main controller, rather than the main controller to
use to
> > recover data from the period it was down...? Starting to make
> sense now....
>
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