Help with remote Temperature & Humidity measurement

pcs2008(7)October 30, 2009

Hi- I am in the process of building an 8'x10' greenhouse and would like to remotely monitor the temperature and humidity with input to my computer so that I could data log and get alerts as to high and low temperature.

The greenhouse will be about 165 ft (as the crow flies). I don't think the standard remote monitors such as oregon scientific can handle this range.

Would appreciate any ideas on how I might monitor greenhouse temp/humidity on my computer. Anyone doing this?



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I'm using a wireless Davis Weather Station. You can see how I have mine set up at the URL below. I monitor temps, humidity, wind speed (really fan speed if I have it positioned in a certain part of my greenhouse), etc. The Davis weather station is NOT CHEAP, but it's reliable and problem free. You need either a serial port or a serial to USB if your PC doesn't have an RS-232 (serial port).

If you hit the Links section of my web page you can drop down and look under Geek Porn for links to the software and hardware I'm using.

Also apologize for the "clutter" on my page as I have not taken the time to update in some time.

Good luck,

Here is a link that might be useful: Greenhouse conditions

    Bookmark   October 30, 2009 at 7:56AM
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karin_mt(4 MT)

We just got a Davis weather station last weekend and it ROCKS! However it is pricey and may be more than you need for a GH. If you aren't in the mood to shell out the big bucks, I do think an Oregon Scientific model could work. The chart below gives handy info to compare stations from several companies.

Here is a link that might be useful: weather station comparison chart

    Bookmark   October 30, 2009 at 12:09PM
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I think the thing I liked was the Davis weather station had options that I could grow with if I wanted. Once I got it, I liked that it was an easy set up and just worked. I've not used the Oregon so it may be just as easy or even easier. A lot of the people who use these weather stations raved about the David quality and accurate calibration ("you get what you pay for" was a comment I frequently saw).

Also it wouldn't be a bad idea to check out BOTH and I have no connection to them other than this is where I got mine for the lowest price I could find plus I got fast delivery.

Good luck and let us know what you go with in your greenhouse.


Here is a link that might be useful: Greenhouse conditions & webcam

    Bookmark   October 31, 2009 at 1:17PM
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kudzu9(Zone 8a - PNW)

After trying a couple of brands, I've found that LaCrosse Technology makes reliable monitors with good range. I have one that is supposed to be able to transmit up to 330 feet; I'm about 150 feet from the GH and the receiver is on the 2nd floor of my house on the side opposite from the GH. I never have a problem with reception. My monitor is a simple model that registers two temperatures: one is the ambient temp in the GH and the other is the temperature from a probe that I put in the soil of my seedling trays (they're on heat mats, so it's important to know this). My monitor does not transmit humidity, but I don't do anything to control humidity so I don't care about that. Here's what you can get for $30...

Here is a link that might be useful: Weather station

    Bookmark   October 31, 2009 at 1:47PM
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karin_mt(4 MT)

I had the same one as Kudzu, but the sensor bit the dust within a few months. I don't know if it was the high humidity or what (it seemed a little corroded-looking around the battery contacts). I liked the concept of the soil probe and it was nice while it lasted. I'm glad yours is working out better. Perhaps I'll buy another sensor and give it a shot again.

    Bookmark   October 31, 2009 at 5:27PM
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web4deb(5 CT)

I designed my own system to control my greenhouse. I posts the data on a web site so I can control it while I'm at work. Not your typical off-the-shelf system... I can leave it safely for a week at a time without needing to check it.

    Bookmark   October 31, 2009 at 7:16PM
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kudzu9(Zone 8a - PNW)

Sorry to hear that. I've used mine continuously for over 3 years with no problems. The only issue I've had is losing the signal about once a year when the batteries in the sensor or receiver get low, but that's easy to fix. Is your unit not showing any display at all even after putting in new batteries? LaCrosse provides a 1 year warranty, so I would ask for a replacement if the unit is completely dead.

    Bookmark   October 31, 2009 at 8:03PM
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tominnh(5 NH)

I have ordered both the Davis system that JustplainDon speaks of and will be doing a web page for remote condition viewing. I also ordered a similar unit to what kudzu9 speaks of as a secondary backup to low temp emergencies. Lots of great advise on here and I thanks you all !

    Bookmark   November 1, 2009 at 7:39PM
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karin_mt(4 MT)

Thanks for the tips Kudzu,

The receiver still works just fine, as does one of the sensors. It's just the second sensor with the soil probe that quit. I blew it on the warrantee period, duh.

Last time I fiddled with it I sanded the buildup off the battery connection points, then put in fresh batteries. It worked for just a little while, then stopped.

This past summer was cool and I upgraded our misting system, so I didn't need to watch things so closely, and I didn't feel a need to keep an eye on multiple locations in the GH.

What I'd really like is a datalogging version so I could observe temps in the air, soil and water barrels as things chill down at night. But this is a pretty low priority compared to all the other things I spend money on in the GH! :)

    Bookmark   November 3, 2009 at 10:32AM
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tominnh(5 NH)

I got the Davis Vantage Pro 2 and set up a web site. The only problem is getting Channel 2 to report through the Virtual Weather Station software..... Any suggestions..?

Here is a link that might be useful: Climate Stats / Local and Greenhouse

    Bookmark   November 14, 2009 at 9:39PM
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