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[wxsig] Ds1994 issue onewire viewer shotscreens

William Beals will at beals5.com
Fri Aug 13 04:56:45 UTC 2010


Rev 1.16.1 software does support the DS1994, so I'm running out of ideas.  The fact it works with a PC makes that a pretty hard-to-believe answer.  A reversed polarity usually does give the "shorted to ground" message, so you did have it right the first time.  That also verifies that you are making OK contact by seeing that short!

I went back and looked at your pictures of the 1-wire viewer and something does not look right there, I am expecting a family ID of 0x24 for the DS1994 and I don't see it in the screenshots.  I finally have the 1-wire viewer running on my Win7 machine (long effort!!), so let me go look at a DS1994 to see what I see.  I think this may be an issue or simply that the new viewer software may be doing something I don't understand.  I will look this weekend and let you know.

I have a candidate 1.16.2 software version to support the DS1904, so if you do get a part before I publish it formally, just let me know and I will send it to you.


-----Original Message-----
From: wxsig-bounces at tapr.org [mailto:wxsig-bounces at tapr.org] On Behalf Of Pedro Motilla
Sent: Thursday, August 12, 2010 2:29 PM
To: TAPR Weather Station SIG Mailing List
Subject: Re: [wxsig] Ds1994 issue onewire viewer shotscreens

Hi will, nice to hear from you. 

Hope your basement works are going on good track.

Well i can not explain what is going on:

Software is discarded as it is 1.16.1 Version, so it is pretty new.

Contact with the can, i used a wooden clip to hold the wires, now I
holded it on my hand making pressure with fingers.

I measured voltage and it shows 4.95 Volts. so it sounds ok.

Just in case I had changed polarity, I reversed the can, and the station
shows a mistake "1-wire device error or short to ground" (maybe not
exactly this but, quite similar.

So the only thing i can think is a defective can. But, in that case, why
it "looks like" it work on computer program???

Maybe I order a new DS1904 part...

Could the ds1994 use a internal battery for any purpose? could this
battery be runned out??

I do not understand. Thanks for answering Will.

Best regards.


El vie, 06-08-2010 a las 21:11 -0600, William Beals escribi�:
> Pedro:
> As you can tell, catching up!
> The screen shots for the DS1994 all look OK, so it very much looks like the DS1994 itself is OK.  I double-checked the datasheet for the DS1994 and the can and flange (the part without the etching) is ground and the part with the part numbers and such is the signal part, so you do have it wired up correctly.  A simple check to ensure all is OK is put a voltmeter on the can when you have it connected.  You should see something pretty close to +5V on the printed part since the communications are narrow pulses.
> Are you sure you are making good contact with the can.  It is stainless steel so the can had better not corrode, but not sure about what connection methods you are using.
> Final question, what revision software are you using?  DS1994 support was added in Rev 1.10.0, so quite a while ago.
> will
> -----Original Message-----
> From: wxsig-bounces at tapr.org [mailto:wxsig-bounces at tapr.org] On Behalf Of Pedro Motilla
> Sent: Saturday, May 22, 2010 5:46 AM
> To: wxsig at tapr.org
> Subject: [wxsig] Ds1994 issue onewire viewer shotscreens
> I have updated software, checked wiring, contacts... so the only thing i think is a 1994 defective part?
> I enclose the shotscreen from onewire viewer, just in case anybody can check his own 1994 and see if there is any difference, which could explain why it does not comunicate.
> Thanks.
> Pedro.
> _______________________________________________
> wxsig mailing list
> wxsig at tapr.org
> https://www.tapr.org/cgi-bin/mailman/listinfo/wxsig

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