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Hi
I'm also looking at the 1 wire stuff for
temperature sensing, switch sensing and access control. Some of the cat5
runs
I'm putting in are just for this. However if you read some of the Dallas
articles on the lengths of bus etc to cover the entire house and have many
sensors would be very difficult unless it is split into sub nets with the
ds2409.
My idea at the moment is to have cat5e running
from
all areas back to node 0. Build a simple sub net switch with the ds2409 to
enable each cat5 to be enabled / disabled. The software would first scan
the bus
for all 2409's and then turn each on in sequence and rescan to find each
sensor
on that sub net. Eventually building a picture of the entire network. If
data
alters on one of the sub nets a flag is set in the 2409 so by scanning the
2409's you can tell if you need to service that sub net.
The hub mentioned in an earlier post will
allow for
what I have mentioned although I think I will go a slightly different
route.
I doubt I will have any time now until a few
weeks
after I have moved but if no one else has anything then I will start to put
something together. I will need it myself and what ever I do I'll put
the
details on the net for anyone to use.
You can check the datasheets for the DS2409
(microlan coupler), DS2406 (i/p and o/p) and the DS1820 (temp) for more
info.
Ian D
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