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[wxsig] wind sensor prob

wn0x at earthlink.net wn0x at earthlink.net
Thu Mar 1 16:34:51 UTC 2007


Is the "T" shunt in place on the X1W?  When setting up the T238 for temperature I completely removed my wind sensor from the network and left the X1W in place.  The T238 correctly identified the DS18S20 on the X1W.  I thought the firmware listed temperature sensors if it saw more than one.


-----Original Message-----
>From: John Vause <jdv at iglou.com>
>Sent: Mar 1, 2007 9:07 AM
>To: TAPR Weather Station SIG Mailing List <wxsig at lists.tapr.org>
>Subject: Re: [wxsig] wind sensor prob
>I just tried this (had the wind sensor down to replace a wind direction
>reed switch).
>Once I unsoldered the temp sensor on the wind sensor board I could not 
>set any temp sensor in the T238 (1.15.8 firmware) setup including the 
>temp sensor on the humidity sensor board.
>William Beals wrote:
>> Rich:
>> I don't think there's harm in leaving the sensor there.  For the times it
>> really needs to digitize the temperature I do put the 1-wire bus in the
>> "strong drive" mode per the device spec, so the only extra power should be
>> for the 1-wire interface itself, not the temperature sensor.    It would
>> certainly cut down on confusion though to see only one sensor! 
>> will
>> -----Original Message-----
>> From: wxsig-bounces at lists.tapr.org [mailto:wxsig-bounces at lists.tapr.org] On
>> Behalf Of wn0x at earthlink.net
>> Sent: Wednesday, February 28, 2007 4:05 PM
>> To: TAPR Weather Station SIG Mailing List
>> Subject: RE: [wxsig] wind sensor prob
>> John, 
>> I noticed that my error rate dropped to almost nothing once I supplied 5
>> volts to my X1W Humidity/Temp sensor and used it for temperature.
>> Will,  Do you think there would be any value to removing the Temp sensor
>> from the weather head unit if not used?  Does it draw power even if not
>> queried for temperature?
>> Rich wn0x/ap006
>> -----Original Message-----
>>> From: John Yost <k3yjp at yahoo.com>
>>> Sent: Feb 28, 2007 4:25 PM
>>> To: TAPR Weather Station SIG Mailing List <wxsig at lists.tapr.org>
>>> Subject: RE: [wxsig] wind sensor prob
>>> Will:
>>> Good News.  It works!
>>>  Don't know for sure what the problem was but temp, speed and 
>>> direction are working fine.  I am suppling the +5 to the temp sensor 
>>> since it does not work without it.  I think it should work without 
>>> doing that, but I intend to connect a X1W-2v2 Outdoor Humidity and 
>>> Temperature Sensor for that purpose.
>>> Received the DS1994 today and intend to add that directly to the T238, 
>>> after "programming" it on the pc.
>>> The modem is sending packets that I can see in UI-View, but I haven't 
>>> seen anything show up on any of the APRS activity sites like findu.com.  
>>> Not being an APRS person I presume its okay since I did recieve its 
>>> signal(connected to HTX-202) and that of many others.
>>> Its been connected for a good 24 hours and still no sign of me on 
>>> findu.
>>> Thanks for your help and a terrific project.  And, this 1-wire network 
>>> is something.  I was surprised at what can be done with it...some 
>>> projects are swirling in my head.
>>> john
>>> --- William Beals <will at beals5.com> wrote:
>>>> John:
>>>> Those current numbers look a little suspicious.  The 1-wire bus and 
>>>> the AAG sensor are totally powered through a single 1.5K ohm pullup 
>>>> and a digital logic "active high" drive.  The only sensor I know of 
>>>> that requires power outside that is the BP sensor that does reqire a 
>>>> dedicated +5V wire.  Maybe you were measuring microamps?  The 
>>>> voltages on that bus do vary quite a bit due to it being both a power 
>>>> bus as well as a data bus.  If you'd like to learn more about it, any 
>>>> of the 1-wire device datasheets has a decent overview of the 
>>>> protocol, for example
>>> http://datasheets.maxim-ic.com/en/ds/DS1990A-F3-DS1990A-F5.pdf.
>>>> Good luck on the modem.  The tricky part for that is getting the 
>>>> audio levels and keying for your radio.  Other than general 
>>>> guidelines, I don't offer much advice in the manuals.  If you do run 
>>>> into problems post here as there are quite a few folk who have gone 
>>>> through it before.
>>>> I totally understand the frustration!  Having built my stations quite 
>>>> a while ago, it has been a while since I've gone through the hardware 
>>>> gyrations, but am going through a new project right now where I've 
>>>> made some inintended smoke!  It is probably going to take at least 
>>>> 2-3 weeks to get "basic life" out of it.  Patience isn't my strong 
>>>> point.
>>>> will
>>>> -----Original Message-----
>>>> From: wxsig-bounces at lists.tapr.org
>>>> [mailto:wxsig-bounces at lists.tapr.org] On Behalf Of John Yost
>>>> Sent: Sunday, February 18, 2007 1:55 PM
>>>> To: TAPR Weather Station SIG Mailing List
>>>> Subject: RE: [wxsig] wind sensor prob
>>>> Latest update,
>>>> The voltages at the processor pins for the 1-wire bus are the same at 
>>>> the connector - maybe I wasn't on the right pins before, it was 
>>>> getting late.
>>>> The unit seems to be working fine so far.  I measured the current 
>>>> draw for the AAG Electronica V3 sensor and, not surprisingly, found 
>>>> it varied all over.  The
>>>> +5 power line ran 20-240 ma and the 1-wire bus is
>>>> 30-210ma.  Not sure, but that looks like a lot of current for this 
>>>> device.
>>>> Seems that the T238 wouldn't want to support many devices if they all 
>>>> draw this kind of current.
>>>> Now, lets see if the modem will send, haven't seen the LED's light 
>>>> yet, hopefully I just haven't caught them.
>>>>   They worked during the circuit test.
>>>> This sure has been a fun experience, in spite of the frustration for 
>>>> a while.
>>>> Thanks for any suggestions.
>>>> john
>>>> --- John Yost <k3yjp at yahoo.com> wrote:
>>>>> Tnx will,
>>>>> I am using the AAG Electonica v3 weather senors. 
>>>>> Modem  board not connected.
>>>>> Bus voltage was 4.94, Bat volt = 8.8 from the
>>>> status screen.
>>>>> Measured bus voltage varied from 4.6 to 4.94.  I
>>>> suspect that the
>>>>> voltage probably dropped lower but my meter isn't
>>>> fast enough to track
>>>>> it.
>>>>> Cleaned the RJ11 and that seemed to help some, got
>>>> wind direction.
>>>>> Poked around on the board and found that the
>>>> voltage at the processor
>>>>> (pins 23,24,25) is steady at 4.94 volts, but it
>>>> was jumping around at
>>>>> the connector.
>>>>> Redid all the solder joints - no improvement.
>>>>> Since the AAG will accept external power and the
>>>>> T238
>>>>> can supply that power, I connected those lines. 
>>>>> Works
>>>>> great.  Temp, wind speed and direction and error
>>>> counters are all
>>>>> zero!  Bus voltage still jumps around as before.
>>>>> I'm going to try putting a jumper from the
>>>> processor to R16 to see if
>>>>> that will improve that connect.
>>>>> Also, I need to check the actual value of R16,
>>>> guess it could be off.  
>>>>> Would like to see it work properly before
>>>> expanding to other sensors.
>>>>> Thoughts?
>>>>> john
>>>>> --- William Beals <will at beals5.com> wrote:
>>>>>> John:
>>>>>> It does smell of some kind of intermittent
>>>> communication error of
>>>>>> some kind.
>>>>>> Firstest and easiest thing to try is check
>>>> things out on your bench
>>>>>> with nice short cables to all the sensors.  If
>>>> problems are ony with
>>>>>> longer cables, that is a unique debugging
>>>> strategy.
>>>>>> If the problem is on your bench, then check for
>>>> standard stuff like
>>>>>> dry solder joints on all the components
>>>> associated
>>>>> with
>>>>>> the 1-wire interface,
>>>>>> including the connector.  It may not hurt to
>>>> insert/remove the RJ11
>>>>>> jacks a dozen times in case some flux may be on
>>>> the connectors.
>>>>>> Something else to check is the 1-wire bus
>>>> voltage.
>>>>>> One of the display
>>>>>> screens while you are showing wx data will show
>>>>> the
>>>>>> bus voltage.
>>>>>> Additionally check the bus voltage at the T238
>>>> connector and sensor
>>>>>> with a voltmeter, if all are >4.5V life is good,
>>>> if any
>>>>> is
>>>>>> low, let us know.
>>>>>> Also, if not done already, ensure minimum
>>>> sensors
>>>>> on
>>>>>> the network to see if
>>>>>> it an individual sensor that may be messing with
>>>>> the
>>>>>> 1-wire bus.
>>>>>> Hope that helps, based on your answers,
>>>> hopefully
>>>>> we
>>>>>> can get an idea of
>>>>>> where to head for round 2.
>>>>>> will
>>>>>> -----Original Message-----
>>>>>> From: wxsig-bounces at lists.tapr.org 
>>>>>> [mailto:wxsig-bounces at lists.tapr.org] On Behalf
>>>> Of John Yost
>>>>>> Sent: Tuesday, February 13, 2007 9:08 PM
>>>>>> To: wxsig at lists.tapr.org
>>>>>> Subject: [wxsig] wind sensor prob
>>>>>> I just finished up the T238+.  Nice kit.
>>>>>> After a couple of power on-off cycles, the temp
>>>> sensor has become
>>>>>> intermittent - works for a few cycles then just
>>>> dashes for a couple
>>>>>> cycles.
>>>>>> The wind direction senor stopped altogether,
>>>> just
>>> === message truncated ===
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>*   My favorite law: The Law of Unintended Consequences   *
>*                                -- John Vause            *
>*  "Environmentalism as a metaphysical ideology and as a  *
>*   worldview has absolutely nothing to do with natural   *
>*   sciences or with the climate.                         *
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