Wonderful.

The humidity sensor as first published in "Sensors" magazine by Dan
Awtrey used the HIH-3600 sensor and the VDD and VAD pins of the
DS2438.

See http://www.elin.ru/files/pdf/1-Wire/humsensor.pdf -- it's nicely written.

In my naivety I created a humidity file off the main DS2438 directory
calculating humidity using this circuit. It confused people who had a
DS2438 not set up for humdity (I think they hoped to get humidity for
free) but worked with all the extant humidity sensors.

Once Honeywell upgraded to the HIH-4000 and others used the HTM1735 I
had a bit of a problem. For backwards compatibility the main humidity
stayed calculated assuming the HIH3600, but to be accurate you need to
know your sensor design and use the correct humidity reading:

HIH3600/humidity
HIH4000/humidity
HTM1735/humidity
and now
DATANAB/humidity

Because the DATANAB identifies itself, I can have the main humidity
point to DATANAB/humidity if it's a DATANAB design, and
HIH3600/humidity otherwise.

Can you tell me if you have

DATANAB/reset
DATANAB/humidity

displayed in your directory?

Paul Alfille


On Tue, Jun 21, 2011 at 1:57 PM, Matthias Lemke <m...@box.li> wrote:
>
>
> Paul Alfille schrieb:
>> A minor release, mainly to get the Datanab humidity support out there.
>>
>> New release 2.8p10
>>
>> 1. Support for the DataNAB humidity sensor.
>> 2. Don't cache empty directories
>>
>> The DATNAB humidity sensor uses the familiar HIH-4000 sensor and the
>> DS2438 like the other humidity sensors, but measures sensor voltage
>> with the current sensing pins rather than the VAD pins.
>
> the Datanab probe works like a charme.
> the correct value for humidity is in ./humidity
> HIH3600/humidity
> HIH4000/humidity
> HTM1735/humidity
> have different values.... right?
>
> mercy
>
> math
>
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