RE: Last Night in London?

["Broadfoot, Kieran J" <Kieran.Broadfoot@xxxxxxx>]

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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____________________________________
Automated Home UK
http://www.automatedhome.co.uk
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Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/