Sensaphone is the system that many people use for greenhouse monitoring.
http://www.sensaphone.com/

It will call you on any phone you ask it to if certain conditions are met.
Temperature, intrusion, power failure, etc. You can probably set it to
monitor the news and call you when Bin Laden blows up a major oil producing
facility and thereby puts all greenhouses run on oil out of commission. It
costs about $400.00 However, without a back up power and heat system, all
it can do is call you when you are away to say your orchids will soon die.
Look into a generator with some kind of auto-start switch and a back up
heater, if you don't already have these in place.

I have a neighbor with a greenhouse who lets this infernal machine have *my*
home phone when she goes out of town. I believe it has the ability to cause
reasons to call in the middle of the night, among all it's other talents.

I don't use this system here. ;-0 I never leave. Still I have a back up
generator and two heaters in case one fails. Believe it or not there has
already been a case when the two heaters went down at the same time, and a
time when the auto-start switch shorted out at a power failure and caught on
fire. This is why I never leave.

I have a "Thermalarm III. A low cost wire connected BUZZER that sounds
inside my home if the temperature in the greenhouse goes outside a certain
preset range. Very helpful to scare you awake during the night but you have
to be home to hear it.. Low cost, about $50.00
http://www.thermalarm.com/Products/thermalarm3.html

I live in Virginia too. How'd you like those 17 degree temperatures the
other night?

"Reka" wrote in message
...
GARLAND HANSON wrote:
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
My Oregon Scientific with three remote units can be set to set off an
alarm per unit when a high or low temp is reached. Again, it is the
EMR899, which is a European model.

--
Reka

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