I'm new to the greenhouse game, but I've purchased this - [URL="http://www.absoluteautomation.ca/temperaturealert-completesystem-p/temperaturealert.htm"]http://www.absoluteautomation.ca/temperaturealert-completesystem-p/temperaturealert.htm[/URL] and in testing it works well (won't really find out for another few months!)

thanks for the Link. Let us know how it works... but at that price it should do about anything a bit pricy for my budget

Will do. And yah, I was hesitant but I figured even if just saves one frost a year in the greenhouse it will become worth it over a few years.

It Works!
 

The other night my chime went off, went and checked and sure enough the temp in the hot house had dropped enough I would have lost my plants if I hadn't brought out the space heater.

Glad to know it did the job! The first year I used my greenhouse, I actually slept out there for a night before I put the plants out so I could check the drops in temperature in person! I still get razzed about it each spring when I first put the seedlings out - am I going to bring my sleeping bag out? I have two remote thermometers in each end of the greenhouse and on super cold nights get up every few hours to check, just in case the heater quits on me or power goes out for some reason. Sure would be comforting to have an alarm like yours.:cute:

Dee when I get home I am going to hook you up with something that would be fantastic for what you need.
Worth

[QUOTE=Worth1;470670]Dee when I get home I am going to hook you up with something that would be fantastic for what you need.
Worth[/QUOTE]

A thermostat fitted to a 110 outlet box?

[QUOTE=Tapout;470755]A thermostat fitted to a 110 outlet box?[/QUOTE]
No actually a Rainbird wireless rain freeze sensor.
I just need to get home so I can see how many volts it runs off of.
You can adjust it for temperature setting and it has a set of normally closed contacts that open when the temperature gets low or there is rain.
All you need is a box, small transformer, buzzer, an off off or on on switch and a four pole double throw relay.
When the temperature gets low it will buzz you silence it when the temp gets back up it will buzz again and you flip the switch back to normal.
With a 120 Volt plug you can move it any where you want.
The sensor runs off a battery that lasts over a year and you can run multiple sensors to the one controller.
I just looked and it runs off 24 Volt AC and has a distance of 700 feet.
Just about any transformer you buy can be wired for 24 and 12 volts and or both at the same time.
I bet I could do this for less than $100.
Worth

Sounds like a fun project worth.

I will look into it, Worth! It sounds rather complicated on paper for me since I'm "electrically challenged" but if I can puzzle through with a diagram and detailed instructions, it sounds like a cool solution. On my list of things to investigate! Thanks for the idea! :D

[QUOTE=Worth1;470848]No actually a Rainbird wireless rain freeze sensor.
I just need to get home so I can see how many volts it runs off of.
You can adjust it for temperature setting and it has a set of normally closed contacts that open when the temperature gets low or there is rain.
All you need is a box, small transformer, buzzer, an off off or on on switch and a four pole double throw relay.
When the temperature gets low it will buzz you silence it when the temp gets back up it will buzz again and you flip the switch back to normal.
With a 120 Volt plug you can move it any where you want.
The sensor runs off a battery that lasts over a year and you can run multiple sensors to the one controller.
I just looked and it runs off 24 Volt AC and has a distance of 700 feet.
Just about any transformer you buy can be wired for 24 and 12 volts and or both at the same time.
I bet I could do this for less than $100.
Worth[/QUOTE]

Dee I will draw out the diagram soon.
I admit the wiring is a little complicated but nothing you cant get past.
I have seen guys totally baffled at some of the stuff I have made without prints.:lol:
I bought some pickling cucumbers I need to take care of first.
Worth

Worth, take your time -- I won't need the monitor until next March!

I just picked my first greenhouse cuke! :cute: Can't wait to eat it though it's almost to small to share with my husband. Unfortunately it will probably be a couple of weeks before the next one is ready.

[QUOTE=ddsack;471220]Worth, take your time -- I won't need the monitor until next March!

I just picked my first greenhouse cuke! :cute: Can't wait to eat it though it's almost to small to share with my husband. Unfortunately it will probably be a couple of weeks before the next one is ready.[/QUOTE]
Here it the link to the drawing you have almost a year to figure it out.:lol:

[url]http://www.tomatoville.com/showthread.php?goto=newpost&t=36435[/url]

Thanks Worth, good idea putting it in the workbench section. I'll let you know if I ever get it working!

I purchase a La Crosse Technology 308-179OR Wireless Temperature Station with Trends and Alerts on Amazon for about $20. It allows for selecting the temperature at which the alarms goes off. I set it for 37 degrees, and sure enough, it went off the other night when the temperature dropped. With our short growing season, I find I have to take a few chances with early planting. I hope this pays off. Time will tell.