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Davis Instruments Weather Stations / Re: How to test Super Cap?
« Last post by CW2274 on Today at 12:57:12 AM »
I guess my best bet is probably going to be to string DC to it...)
I'm all for DIY, but is the hassle of doing all this and that worth merely just buying a new board?
Davis Instruments Weather Stations / Re: How to test Super Cap?
« Last post by AA1ZA on Today at 12:11:47 AM »
So today after work - armed with a fresh 3V 123a battery and a Fluke 77 multi-meter - I performed the tests as suggested by rdsman earlier...

The weather station had its solar panel faced South all day, though it was overcast for some part of the day and I'm sure it must have spent a good few hours in the shade of a tree at that spot as well, i.e. so it hasn't enjoyed the best of charging conditions today.   (Unlike the day before when I actively moved it around for sunny spots all day and it still only just lasted about 30 mins after sunset).

The SIM was powered today by the new solar panel + new supercap (but no battery) and was transmitting most of the day during the sunlight hours (from about 9am until 5:30pm).  When I arrived home around 6pm, it had died already.

First I disconnected the solar panel and measured the voltage on the supercap, 0.9V.   Then I shorted the cap's legs temporarily to discharge it fully. 

Next I used crocodile leads to connect up the battery in series with the Ammeter.   For the first 40 sec or so, the current went from an initial 180 mA to a max. of 300 mA and then eventually to 0 A.   After that initial rush (which I assume has to do with charging up the supercap?) there was about a 40 sec period of no draw after which it started with repeat cycles of +/- 12 sec on, then 12 sec off.   During the on cycles it drew 20 mA which seems to correlate roughly with Davis' stated consumption of 14 mA.   Even after disconnecting all the sensors, the consumption behavior and values remained the same.

With the battery connected, the voltage across the supercap would not exceed 0.92 V. 

This seems to indicate that my SIM board probably has an issue with charging up the supercap rather than an issue of excessive consumption, right?   (I guess I must be one of the unlucky ones as Johnd had mentioned earlier). 

Your input is welcomed.   Hopefully someone can point me perhaps to a component in the charging circuitry that might be the cause of all of this, otherwise I guess my best bet is probably going to be to string DC to it...)

Dalecoy, mine is a 6322 transmitter.  I did not see an LED on it.   Should it have one?

Weather Website PHP/AJAX scripting / Adding NWS forecast to Settings.php
« Last post by cospringswx on Yesterday at 10:34:55 PM »
I am trying to add another city to the NWS forecasts on this page I have added the printable URL within Settings.php and my site will not load. Is there another place that I need to add this. It has been a long time since I have messed with this page.

Tropical Weather / Re: Hurricane Willa and TS Vicente
« Last post by Jstx on Yesterday at 09:55:54 PM »
It has been an El Niņo year.

No, the 2018 El Nino is just beginning, and is expected to be a weak one. See the bulk of the CPC advisory below (w/ links).

Of course the ENSO/El Nino/La Nina have a large influence on both the Pacific and Atlantic WX and storm systems, plus the continental landmasses.
But anomalous very warm SST's have been driving this hurricane season.

(my bolding for emphasis):
and the International Research Institute for Climate and Society
11 October 2018
ENSO Alert System Status: El Niņo Watch
Synopsis: El Niņo is favored to form in the next couple of months and continue through the Northern Hemisphere winter 2018-19 (70-75% chance).

ENSO-neutral continued during September, but with increasingly more widespread regions of above-average sea surface temperatures (SSTs) across the equatorial Pacific Ocean (Fig. 1). Over the last month, all four Niņo index values increased, with the latest weekly values in each region near +0.7C (Fig. 2). Positive subsurface temperature anomalies (averaged across 180°-100°W) also increased during the last month (Fig. 3), due to the expansion and strengthening of above-average temperatures at depth
across the equatorial Pacific (Fig. 4). Convection was increasingly suppressed over Indonesia and around the Date Line (Fig. 5). Low-level westerly wind anomalies were evident over the western and east-central Pacific, with some of the strongest anomalies occurring over the eastern Pacific during the past week.
Upper-level wind anomalies were easterly over the east-central Pacific. Overall, the oceanic and atmospheric conditions reflected ENSO-neutral, but with recent trends indicative of a developing El Niņo.
The majority of models in the IRI/CPC plume predict El Niņo to form during the fall and continue through the winter (Fig. 6). The official forecast favors the formation of a weak El Niņo,
consistent with the recent strengthening of westerly wind anomalies and positive temperature trends in the surface and subsurface ocean.
In summary, El Niņo is favored to form in the next couple of months and continue through the Northern Hemisphere winter 2018-19 (70-75% chance
; click CPC/IRI consensus forecast for the chance of each outcome for each 3-month period).

[Arrrg, NOAA's CR/LF's play havoc with a simple C&P job]
I didn't remove the solar panels from the housing but, to me, the soldering where the wires connect to the solar panels was really messy.  It sort of looked like cold soldering (not enough heat during soldering).  I even had trouble reading the panel voltage with a good multimeter.
Tropical Weather / Re: Hurricane Willa and TS Vicente
« Last post by Old Tele man on Yesterday at 09:31:54 PM »
It has been an El Niņo year.
I'm starting to see reports of bad/loose solar wiring, I don't have one to look at now as I have returned 2 due to false lightning strikes, but could there possibly be bad connections leading to arcing at the connections that would cause this problem? All my test concluded that if the solar panels are not getting sun no false lightning strikes and if the solar panels are not connected no false lightning strikes.  Does anyone still have a unit with false lightning strikes that they could inspect the wiring on?
Tropical Weather / Hurricane Willa and TS Vicente
« Last post by Jstx on Yesterday at 09:19:37 PM »
Little TS Vicente began to develop last Thursday, became Tropical Depression Twenty-Three-E by 1500UTC on Friday, and a Tropical Storm by 2100UTC.
Vicente never reached hurricane status, probably due to proximity to his big sister Willa.
Both of which formed near an area south of Mexico and the Gulf of Tehuantepec (that narrow part of Mexico where the Bay of Campeche/Gulf of Mexico is just a short distance north of the Pacific Ocean). This area is the spawning place for many East Pacific cyclones.
It has been very active this year.
Hurricane Willa began forming shortly after Vicente and became a tropical storm by 1500UTC on Saturday.
By 0900UTC on Sunday Willa was a Cat 1 hurricane and a Cat 2 by 1500UTC.
Willa continued a very rapid intensification and was a Cat 3 by 2100UTC, major hurricane status (Cat 1 at 0900, Cat 3 at 2100, just 12 hours).
By 2230UTC Willa was upgraded to extremely dangerous Cat 4 status (Cat 1-Cat4 in 13.5 hours).
Willa went to Cat 5 by 1500UTC on Monday. From Sunday, 0900UTC as a Cat 1, to 1500UTC Monday, a Cat 5. 30 hours to develop from a Cat 1 to strong Cat 5.
Just 30 hours duration as a hurricane to reach sustained winds of 160mph; and what many don't realize, much higher gusts which can buzzsaw the terrain and structures worse than a sustained wind can (as a sixty+ year long sailor/mariner, I can state that the gusts will get you).
As of 0000UTC Tuesday, Willa has slipped (due to an eyewall replacement cycle) to a very strong, still extremely dangerous Cat 4, with landfall expected near San Blas/Mazatlan on Tuesday afternoon.
Willa's remnants will then make a beeline across the Sierra Madres straight into South, Central and East Texas (probably even Houston, etc), see the NHC future track chart.

This extremely rapid intensification cycle has occurred with many hurricanes this year, recent devastating Atlantic Hurricane Michael for example (probably the most expensive US storm yet).
I'm anticipating some interesting scientific papers from the professional hurricane scientists about this phenomena later on.

Here in South and Central Texas, we haven't yet recovered from intense, expensive '500-year event' flooding events triggered in part by moisture plumes/WX systems from other recent Pacific hurricanes over the last month or so.
Now the future remnants of Willa (and Vicente) are expected to bring more major rainfall this week. Much more flooding is expected this week. The rivers are still high, and forget about soil moisture, it's basically boggy, even the caliche.

But let's not talk about that subject which shall not be mentioned around this noted WX website.
Looks like the new Sensirion SHT85 humidity and temperature sensor will soon be available. Both Mouser and Digikey have it listed and you can pre-order. Mouser says availability is December 3rd and Digikey is saying November 14th.

From the spec sheet it looks like this will replace the SHT75 as their flagship product. The SHT75 was starting to become dated where in some respects the SHT35 was better. Good timing from Sensirion on coming out with the SHT85.

This new sensor will only be I2C compatible. Which means current Davis stations will not be able to use it. Although some work is being done by rdsman on this forum to try and convert I2C to sensibus via clever technique of drop and insert into the sensibus signal using both an old a new type sensors simultaneously.

It is possible that some newer devices like Ambient Weather WS-2000 or WS-2902A and also Acurite with the Atlas line, that they could get hacked and replace the existing SHT3x in those devices for the SHT85. These new devices are most likely using the new I2C protocol versions of the  SHT3x and should make replacement with the SHT85 straight forward. Of course there might be mounting or soldering hacking involved. Ambient is using the SHT30 and Acurite is using the SHT31.

Really would be nice to see Davis finally release a VP3 that uses the I2C protocol with a brand new SHT85 to rule the roost. Unless Davis has hoarded up sufficient amounts of old discontinued stock of SHT31 sensors with the old legacy LSS protocol, they will need to come out with a new VP3 soon. Let's hope that they update their display consoles too while they are at it.

Is anyone planning on experimenting with the SHT85 sensor? Price of this new sensor is around $30.
Davis Instruments Weather Stations / Re: How to test Super Cap?
« Last post by dalecoy on Yesterday at 08:38:35 PM »
You could test using the power supply that you are (probably) powering your Envoy with, of course.  And for a short test (an hour or so after dark), your WeatherLinkIP should continue to work OK on the Envoy batteries.
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