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Data and monitoring: Cheap and easy humidity and temperature monitoring - is there such a thing?

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    • CommentAuthorlineweight
    • CommentTimeMar 14th 2011 edited
     
    I'm in the process of doing some internal insulation, and this may come to nothing but I was thinking that it could be interesting to see what actually goes on within the wall buildup in terms of humidity and temperature, over the course of time. This would partly just be for my entertainment but could also be useful in letting me know if any condensation or dampness problems were developing.

    So, is there such a thing as a cheap humidity or temperature sensor, that would be able to somehow send info back to my computer or something? It would have to be relatively easy to set up as I'm not a computer or electronics expert.

    Just wondering if this is the sort of thing others have tried to do really.
    •  
      CommentAuthorSteamyTea
    • CommentTimeMar 15th 2011 edited
     
    Temperature monitoring is very easy and cheap. Humidity reading is not so easy. I have been using iButton for the last few years for temperature logging. Dead easy to set up, they are tiny and do not need 'wiring in'. Unfortunately their Hygrochron has given problems and is not currently available in the UK, so I am currently trying to find a suitable alternative.

    I also have a LabJack data logger than can take multiple sensors but needs a PC attached, very accurate and easy to use but costly to run.
    CurrentCost do an 'energy monitor' that has a built in temperature sensor but not sure of the accuracy as I cannot easily calibrate it, can be logged to a PC as well though with a default timestamp of every 6 seconds, so loads of data generated.

    There is temperature and humidity data available online, but the quality varies, good for some things not so good for others.
    • CommentAuthorHairlocks
    • CommentTimeMar 15th 2011
     
    probably doesn't meet OP needs but a nearest I have found is a DHT11. It can be bought from here http://www.dfrobot.com/index.php?route=product/product&product_id=174
    But you need to learn how to read it. I believe is it close enough to 1-wire for other 1-wire stuff to talk to it (e.g. ibutton) but I think it may have to be on a network all of its own. I am going to use an arduino. There is enough code and stuff out there for a computer enthusiast to get it to work. (no need to be an expert)

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