Garland,

I have coupled a Thermalarm (bimetallic thermometer that uses the needle and
two "stops" as the electrical contacts), with an X-10 sending unit in the
greenhouse (X-10 is a technology that sends signals over your existing power
lines), and an X-10 receiving unit and a Sensaphone in my office.

When the upper- or lower temperature setpoints are reached in the GH, the
Sensaphone goes through a 5-stage routine:

1) It alerts my office with an electronic voice that there is an "alarm
condition." If I don't acknowledge it, after 10 tries,
2) it calls my home number to repeat the process. Failing that,
3) it calls my "real job" office, then
4) it calls my cell phone, and finally,
5) another number I add when I'm away.

The Sensaphone has a built-in power-outage alarm and a thermister in case my
home gets too cold, plus two other connectors for other sensors, and a
microphone, in case it gets too loud in my home office (a break-in, for
example).

Check eBay for Sensaphones, as they list for about $400 new.

--

Ray Barkalow - First Rays Orchids - www.firstrays.com
Plants, Supplies, Books, Artwork, and Lots of Free Info!
..
"GARLAND HANSON" wrote in message
news:YGBwd.6263$mn6.518@trnddc07...
To followup the "Wireless Thermometer" thread, I wondering what folks are
using as a remote low temperature alarm. I'd like to get an indication of
low greenhouse temperature in my house, bedroom, cell phone, palm pilot,
etc. that would alert me to avoid diaster! I'd also like a security
system tied into the same system.

Something simple that will let me know if the temps is going too low or if
the door is forced open...

Power outages are not uncommon in this part of Virginia so something that
would work under those conditions would be a plus!

Thanks in advance,
Garland