Re: 1-wire to USB converter that can use 1820s directly

[Marc F Hult <MFHult@xxxxxxxxxxxxxxxxxxxxx>]

On Wed, 19 Apr 2006 13:06:39 GMT, nobody@xxxxxxxxxxxx (Dave Houston) wrote
in message  <44463584.194072640@xxxxxxxxxxxxx>:

>While not cheap, here's another approach.
>
>     http://embeddeddatasystems.com/page/EDS/PROD/HA/HA7Net

The HA7net turnkey etherent device looks very handy indeed, especially if
Embedded Data Systems continue to add capabilities. The idea of modifying
Linksys WRT54G's and other Linux based ethernet routers (topic in a
different recent thread) to handle 1-wire and especially other I/O intrigues
me too.

Some of their devices are quite pricey. Their 0-10vdc output at $100 a pop
makes the 72-channel, 0-10vdc DMX512 interfaces I got from eBay for ~$100
'worth' $7200 each ;-)

This Kentucky company also sells the HA7E - ASCII 1-Wire Host Adapter. It is
the only device supported by the 'free' Homeseer plug-in I mentioned earlier
in this thread. For a $100, shipping included, one can purchase from them
the HA7E and 15 (fifteen) DS18S20 temperature sensors.  If one has installed
conventional Cat-5 ethernet in a home, it is likely that there are extra
pairs that could be pressed into service for a comprehensive temperature
monitoring network using 1-wire. Calibrate all 15 at once and add correction
via the data base (see paragraphs below).

The 'free' 1-wire HomeSeer plug-in by Ultrajones (Randall Jones) provides
for logging the data to Microsoft Access 2003 (database included), Microsoft
SQL 2000 and Microsoft SQL 2005.

Because the data from the 1-wire devices end up in a relational data base,
it should be straight-forward to merge other data from other sources and
sensors, including other 1-wire channels (="strings"= "runs") from other
1-wire interfaces/bus masters.

This neatyl solves the problem that most HA controllers -- however good they
may be at responding to event-based rules -- are not well suited for logging
purposes.


... Marc
Marc_F_Hult
www.ECOntrol.org