ethernet-based temperature sensors

Speaking on Deep Background, the Press Secretary whispered:

> I know this has been mentioned before, but other than NetBotz (too pricey),
> what are people use as ethernet-based, SNMP-probable temp sensors?

http://www.jacarta.co.uk

Argh -- $$$$

There used to be "spider" sensors that were cheap but I heard
they shut down. What you need is something based on those "stamp"
CPU's but I donno who is making such...

We use a Temptrax device (around $250) which we wrote our own interface
for graphing and alerting. No SNMP, but the price is right. They also
provide plugins for several monitoring systems.

Bob

Speaking on Deep Background, the Press Secretary whispered:
>
> > I know this has been mentioned before, but other than NetBotz (too pricey),
> > what are people use as ethernet-based, SNMP-probable temp sensors?
>
> http://www.jacarta.co.uk

Argh -- $$$$

There used to be "spider" sensors that were cheap but I heard
they shut down. What you need is something based on those "stamp"
CPU's but I donno who is making such...

Turning the question around, what sort of price point are you looking at? A guesstimate says that there's $150 worth of *parts* in a box just to do temperature monitoring that will take an EtherNet connection (unless you were manufacturing a gazillion of them).

I suppose if one had enough time and interest, and some Java skills, you could make something out of these:

http://www.ibutton.com/ibuttons/thermochron.html
http://www.ibutton.com/TINI/applications/sertoeth/

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 :wink:

Bill.