Speaking on Deep Background, the Press Secretary whispered:

Oops, somebody's already done it: http://www.maxim-ic.com/appnotes.cfm/appnote_number/1048/ln/en

Looks like the total hardware cost would be around $100 for the TINI and board, and $8 for each sensor (iButton and holder). I have little time and no Java skills, otherwise it looks like a cool project. If somebody wants to develop a machine room temperature monitoring network out of them, I'd be a beta tester ;)

That looks a lot closer to the Yellow Brick Road than anything else suggested to date. I like the 64 bit SN idea; sounds like MAC addresses... Note there are several analog temp sensors out there -- National has a line that is dirt cheap ($~1.00) and work on current loops [i.e. LONG leads are OK..] so if someone has a SNMP driven A-D.... -- A host is a host from coast to coast.................wb8foz@nrk.com & no one will talk to a host that's close........[v].(301) 56-LINUX Unless the host (that isn't close).........................pob 1433 is busy, hung or dead....................................20915-1433