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[wxsig] Transparent Hurricane

Will Beals will at beals5.com
Sun Sep 18 18:50:36 UTC 2005


The strange battery voltage just means that Warren doesn't have the battery
monitoring circuitry installed, so it is reading a floating input.  I only
thought of that AFTER releasing the original T238 design, so it takes adding
a couple of resistors to create the voltage divider and a Pot if you want to
be fairly accurate.  The suggested schematic is at
http://www.beals5.com/wx/schematics.htm.

Warren:

If you want to start over putting in sensors from scratch, just go through
the setup screens in the order they come up.  If I see both a DS8120 and
DS18S20, I flag both and ask you to pick.  You do need to know the IDs of
both to know which is which.  The DS18S20s have an extra bit in the ID that
helps me pick.  There are a couple other sensors that share the same dallas
chip and I ask you to remove certain sensors during the process to help.  It
has been a long time since I've done it, so any feedback would also be
appreciated.

Your theory about the wrong temperature sensor getting picked makes a lot of
sense.  Both RH and BP are temperature compensated values, so seeing them
both go weird suggests a common cause.  Would be nice if the practice
matches the theory! :)

will

-----Original Message-----
From: wxsig-bounces at lists.tapr.org [mailto:wxsig-bounces at lists.tapr.org] On
Behalf Of John Koster
Sent: Sunday, September 18, 2005 3:30 AM
To: Warren
Cc: TAPR Weather Station SIG Mailing List
Subject: RE: [wxsig] Transparent Hurricane

OK, it's been 6 months since I've had time to play with mine.  Isn't the
"battery voltage" reading the voltage comming in the power connector?

--
73,
John, W9DDD

On Sun, 18 Sep 2005, Warren wrote:

> Well, it wasn't at that time.  It now reads 2.4 for Bty.
> 
> 
> On 18 Sep 2005 at 14:49, John Koster wrote:
> 
> > Is that a typo on the Bat Voltage?
> > 
> > --
> > 73,
> > John, W9DDD
> > 
> > On Sun, 18 Sep 2005, Warren wrote:
> > 
> > > Ok, here are the indicated readings that show the peaking with
temperature.
> > > 
> > > Time	T	RH	DP	BP	Debug
> > > ======	==	==	==	=======	
> > > 14:30	69	85	63	28.41	v0141 a000F t1400
> > > 16:00	82	47	60	28.07	v0142 a0050 t1080
> > > 16:05	87	15	35	27.81	v0143 a0051 t1F80
> > > 16:10	92	15	37	27.80	v0143 a0050 t2080
> > > 16:20	104	14	46	27.81	v0144 a0051 t2880
> > > 
> > > Bus voltage varys from 3.71 to 3.73 Bty voltage 2.8
> > > 
> 


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