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Best waterproof temperature and humidity sensor solution..

Posted: Tue Sep 25, 2012 9:58 am
by NewPi
I am looking for a waterproof temperature and humidity sensor which works with Rpi GPIO, it seems DHT11 and SHT1X works with rpi but are not waterproof, would love some pointers to proceed.

Thanks

Re: Best waterproof temperature and humidity sensor solution

Posted: Tue Sep 25, 2012 10:29 am
by bredman
It will be impossible to find a waterproof humidity sensor. By definition, a humidity sensor needs to be water permeable.

Re: Best waterproof temperature and humidity sensor solution

Posted: Tue Sep 25, 2012 10:45 am
by malakai
What is the intended application where to place maybe we can brainstorm something around these I really want to make one up.

Re: Best waterproof temperature and humidity sensor solution

Posted: Tue Sep 25, 2012 10:48 am
by g1gsw
You can spray the boards with water proofing lacquer but as was said above keep the humidity sensor component itself clear as it needs to absorb moisture to give a reading. I have mine inside a Stevenson Screen which protects them from the bulk of the weather.

Re: Best waterproof temperature and humidity sensor solution

Posted: Tue Sep 25, 2012 4:34 pm
by gordonendersby
I have a DHT11 tucked up under the eaves outside my office window.
So its out of the worst of the weather.
I soldered cat5 cable directly to the leads and covered the soldered jounts and expose leads from the device with Sugru(http://sugru.com/). Sticks like super glue, is mouldable and waterproof.
Obviously I didnt cover the vents on the DHT11.
It not only insulated the wires but also provides strain relief for the cable.

Gordon

Re: Best waterproof temperature and humidity sensor solution

Posted: Wed Sep 26, 2012 2:46 pm
by NewPi
bredman wrote:It will be impossible to find a waterproof humidity sensor. By definition, a humidity sensor needs to be water permeable.
That makes sense :oops: , what was I thinking :? .

Re: Best waterproof temperature and humidity sensor solution

Posted: Wed Sep 26, 2012 2:47 pm
by NewPi
malakai wrote:What is the intended application where to place maybe we can brainstorm something around these I really want to make one up.
I live at a hill-station with a lot of tourist activity all round the year, I would like to have a cheap weather update mechanism which will post temperature and humidity updates to my blog and other weather channels for public consumption.

Re: Best waterproof temperature and humidity sensor solution

Posted: Wed Sep 26, 2012 2:49 pm
by NewPi
gordonendersby wrote:I have a DHT11 tucked up under the eaves outside my office window.
So its out of the worst of the weather.
I soldered cat5 cable directly to the leads and covered the soldered jounts and expose leads from the device with Sugru(http://sugru.com/). Sticks like super glue, is mouldable and waterproof.
Obviously I didnt cover the vents on the DHT11.
It not only insulated the wires but also provides strain relief for the cable.

Gordon
I guess this should do the trick, DHT11's are cheap and can be spared. BTW, how long we can have the cable length, wouldnt it impact the reading somehow ?