[AllyCat]

Hi,

I've not "researched" this answer, but AFAIK the SHT31 uses an I2C bus. So firstly, is the "test utility" reporting the SHT31's I2C address correctly?

Cheers, Alan.

[werk_ag]

You are right Alan, the SHT31 uses I2C bus (just like the SHT21) and the test utility supplied with the WeatherDuino Pro2 could be used to check for it's presence, however for read from it, a specific library is required. The SHT31 is not compatible with the SHT21 library.

[uncle_bob]

So guys,
Do we have a recommendation yet?
My SHT11 (I think) is going nuts on the humidity front so I need to replace it. It's outside in a aspirated Stevenson screen.

Here's what the little blighter is doing:

[werk_ag]

Hello my friend

I noticed a strange thing on the graph: The humidity value goes crazy after it reaches a zero value. I don't know why you are getting so low values for humidity, but there is also the possibility that those jumps to 100% be caused by a software problem if for some reason the humidity value goes bellow zero. I will check this soon.

[uncle_bob]

Thanks Werk,
The system has been fine until recently so while the software might be doing something weird at low values, I think it will come good once I get a replacement.

[spudstrawb]

So guys,
Do we have a recommendation yet?

I've purchased an SHT15 from ebay. Once it gets here, I'll connect it to the TX unit. If Werk_AG gets the SHT31 incorporated as a supported sensor in the software, then I'll install that as well (as an extra sensor) and will be able to compare the two over time.

[JT118]

As humdity can never be zero, ( nor 100%, even when raining),

even if you live here, the world's lowest recorded relative humidity value occurred at Coober Pedy in the South Australia desert when the temperature was 34C and the dew point was -29C producing a relative humidity of 1 percent.

The sensor would appear to be the problem, have you tried "rehydrating" it as per my previous post. I think it may settle down if you did. Worth a try.

[hvalentim]

So guys,
Do we have a recommendation yet?

Well. It's too early to make claims as far as durability is concerned but, as stated elsewhere, I have an SHT75 running for the past month and a half and so far I am happy with it.

It's easier to obtain in a more certain to be original version for as little as 30 euros (or 60 australian dollars) and it provides a Serial-2 Wire interface prone to support longer cables than the IC2.

Also, it's fully supported by current WeatherDuino software as it uses the same library of the SHT1X models. It comes with it's own microboard, no need for soldering, although it will require some imagination to craft a suitable connector (features a very thin 1,27mm pitch).

[werk_ag]

...If Werk_AG gets the SHT31 incorporated as a supported sensor in the software, then I'll install that as well (as an extra sensor) and will be able to compare the two over time.

Just to confirm that the next software release (to publish within a week) will have support for the SHT31.

[spudstrawb]

Just to confirm that the next software release (to publish within a week) will have support for the SHT31.

Good stuff. Thanks Werk_AG. The SHT15 is already ordered but hasn't turned up yet but I'll have both (SHT31 and SHT15) running as a real life comparison.