Temperature/humidity loggers

Discussion in 'Plants: Science and Cultivation' started by Sulev, Aug 20, 2019.

  1. Sulev

    Sulev Active Member

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    Do you monitor weather parameters in your garden with some automatic data logger?
    I use 3 different USB loggers for monitoring the air relative humidity+temperature and the soil temperature.
    A sample graph of temperatures (blue, ºC) and RH (magenta, %) from my melon tent current summer is attached. Unfortunately the BSIDE BTH81 Relative Humidity Temperature Recorder exhausts its battery sooner than one full season and is not very suitable for high humidity environment (readings go grazy at high humidity). My Elitech loggers can work continuously several years without exhausting their battery, but they have no RH logging feature. Is there any good alternatives for recording RH?

    BTW, despite the global warming, this summer has been rather cold here. According to the official data (Estonian Weather Service) July was one degree colder than the long time average and the first decade of August was even 2.5 degrees colder than the long time average.
     

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    Last edited: Aug 21, 2019
  2. Sundrop

    Sundrop Well-Known Member

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  3. vitog

    vitog Rising Contributor 10 Years

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    Sundrop, what outdoor and indoor units do you use to transmit data to your computer?
     
  4. Sulev

    Sulev Active Member

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    As Sundrop stores information only about extremes and precipitation, it's most possibly done manually. If I am wrong, and there is affordable electronic percipitation recorder, then I am very interested about details. This kind of equipment has usually pretty nice price tag: rain sensor
     
  5. Sundrop

    Sundrop Well-Known Member

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    Yes, as Sulev has guessed I use my fingers and computer keyboard for transmission :-)
    I have a measuring can on my deck to measure the rainfall. As for snow I just look through my basement kitchen window at the steps leading to my house door to see how much accumulation there is. The distance between the steps is exactly 15 cm so I don't even have to measure to know how much snow there is. The error can be in the range of 0.5 cm. I do it for myself only so the accuracy is good enough for me. As for temperature I relay on my local weather forecast. Again, I do it just for myself, it is not part of any scientific study.
     
  6. vitog

    vitog Rising Contributor 10 Years

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    Regarding precipitation, an expensive electronic unit is not worthwhile for most gardeners. I only want to know how much it has rained since the last time I watered the garden, and a cheap tubular rain gauge with a funnel top works quite well. It is also easy to record the amount, since it doesn't usually have to be done every day or at any particular time. Temperature is a different matter; in the Vancouver area there is a significant range of temperature variation. The YVR airport temperatures are usually several degrees cooler on a sunny day and warmer on a clear night than my back yard temperatures. I have a simple electronic indoor/outdoor thermometer that stores the maximum and minimum temperatures since the last reset; but it needs to be reset and the readings recorded every evening, if I want a complete record. I'm looking for a system that will transmit daily max and min temperatures to my computer, or at least store them for a while until they can be downloaded.
     
  7. Sulev

    Sulev Active Member

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  8. Sundrop

    Sundrop Well-Known Member

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    I wonder what do you need such a detailed information for? And doesn't the soil temperature at any given time varies from one spot to another depending on the sun exposure (full sun, full shade, mulch cover, etc.) and the depth you measure it at?
     
  9. Sulev

    Sulev Active Member

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    I need these data to estimate, what is the optimal time for starting different crops, how to plan successive cropping, when to start preparing for harvest (by removing late flower buds to force ripening of fruits) etc. I live only 8 km away from our Weather Service's observation station, but I can't directly use their data, because their temperatures are much warmer in summer nights and at wintertime in general and less hot in summer days (because they are closer to the sea and also more affected by settlement and by traffic. They are lieing on the limestone rock, I live on top of the sands, 30% higher than the weather station). And they don't provide easily perceptibly visualised data, but only inconvenient tables and graphs, that you should look by hour or by day.
    My data are coming almost without any effort. I can see from there, for instance, why my okras are sometimes dropping their flower buds (some nights got too chilly), when exactly was that night frost, that damaged my potatoes or pumpkins in the middle of summer, when official weather forecast predicted +9°C nights, but actual was +5°C only (that means that on the ground light frost was possible). So I know, at what official prediction I have to use floating row covers to protect my plants, and when it is unnecessary, etc.
    I can see, at what time I should ventilate my melon tent or hot bed to prevent it become too hot. I can test different methods how to warm up the soil for cucumbers, and how long different thickness of horce manure or lawn clippings layer under the bed warms the bed enough.
    I live at 59.3N. I see from my data, that this year the longest frost free period was 22 days only.
     
    Last edited: Aug 25, 2019
  10. SpicyDave

    SpicyDave New Member

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    Hi Sulev, I have recently ordered a BTH81 temp/humidity logger and it arrived with no software on it. Any chance you could copy the software from the usb and email it to me? I have tried the manufacturer to no avail, not even a reply from B-side. My email is davewestby7@gmail.com
     
  11. Sulev

    Sulev Active Member

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    Hi @SpicyDave,
    I am glad, that the file I linked to you, worked for you.
    For others, who may meet the same problem, the file can be downloaded from here:
    DataLogger_en
     

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