Re: TEMPer and TEMPerHUM usb thermometer driver

[Paul Goyette <paul%whooppee.com@localhost>]

On Wed, 24 Feb 2010, Andreas Gustafsson wrote:

> Paul Goyette wrote:
> > Thanks, plunky, for commiting the aprint's.
> >
> > As for the second problem (no sensors attached), can you rebuild with
> > the following patch and see what it says?
>
> I haven't actually built with that specific patch, but based on some
> debug printfs I added, I conclude it would print nothing when
> attaching uthum0, and print "sensor type 0 unknown" attaching uthum1.
>
> More specifically, uthum0 is ignored because sc->sc_flen is 0.  Then,
> uthum1 is ignored because the signature read from the device in
> uthum_check_sensortype() is 0x57 0x5a 0x14 0x00 0x14 0x00 0x53 0x00,
> which matches neither of the two signatures the code checks for.
>
> If I change uthum_check_sensortype() to accept the 0x57 0x5a 0x14 0x00
> 0x14 0x00 0x53 0x00 and return UTHUM_TYPE_SHT1x, I get the following
> output from envstat:
>
>                  Current  CritMax  WarnMax  WarnMin  CritMin Unit
>   [uthum1]
>          temp:    28.040                                     degC
>     humidity:     15483


Yep.  The signatures are the only way to figure out how to read the 
actual values.  The temp looks "reasonable" here, although no way to 
tell if it is correct;  humidity definitely looks wrong.

I don't have any details on these devices.  Let's hope tonio can help 
out.


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