Humidity Bounce

[CAI_Support]

WebControl support this Honeywell humidity sensor, which in most cases are accurate and having wide range for measurement. Inside the firmware, we calibrated with Chemical chamber as low as 11.5% and as high as 94%. We have heard some customers asking for support the lower cost DHT11.  That sensor range is from 20% to 90%.  How many percent people think we should drop support for Honeywell sensor and use DHT11 instead?  Because DHT11 is not factory calibrated individually like Honewell, our firmware will not be able to provide the same accuracy for DHT11, if we switch to support that.

 

[az1324]

Support both, change setting in web interface.  Also the Sensirion sensors.

 

[CAI_Support]

One is analog input, the other is digital, they have to be connected to the different pin out.  Sensirion sensor is also digital, similar to DHT11, do you know where to find its programming spec?

 

[az1324]

In the datasheet?  Or here:  https://www.sparkfun.com/products/8227

 

[Tschmidt]

How many percent people think we should drop support for Honeywell sensor and use DHT11 instead? 

I've been happy with the Honeywell sensors I'm using with two WebControl systems, one is in a greenhouse so it is exposed to extremes of temp and humidity.
 
Since relative humidity measurement is somewhat of a black art I vote to stay with what works. By way of example I purchased a dehumidifier this year with a semiconductor humidity sensor (have no idea what kind). Unit reads about 10% RH higher then Honeywell and Davis Weather station sensor I used for compassion. The HIH 4000 in the greenhouse tracks the local NOAA weather station well during the summer. For a one off system the $15 - $20 cost of the sensor is will worth the piece of mind IMHO.

 

[XRinger]

The HIH 4000 works well enough for me. I can check it local RH from other local sources, and it's rare to find they are all in agreement.
Having high accuracy isn't what I need. I need consistency. If the HIH 4000 puts out the just about same voltage at 70% RH,
everyday, even it it's been cold or rainy, it's a winner.
 
Not trying to build a weather station here. I live too close to a swamp to be thinking about high resolution RH readings..
Heck, If I was serious about RH, I would not have hung the sensor anywhere near the laundry dryer exhaust. :blush:

 

[rossw]

I vote for keeping the (more expensive but far better) honeywell one too.
Sure, add an option for using an alternate, but don't drop the one, precision, device - unless you can find something else widely available, cheaper and at least as good! (good luck with that!)
 
I *AM* using it in weatherstations, and the precalibrated accuracy and wide range are VERY important to me.
 
You could have a setup option I suppose, in the same way you can configure IP1 as frequency/counter/TTL_in, you could assign the variable "RH" to either this sensor or a different one for those who want a cheaper option and can live with less precise devices.