WXforum.net

Weather Station Hardware => Oregon Scientific Hardware => Topic started by: sam2004gp on December 19, 2008, 06:52:49 PM

Title: How to make a Cheap - Rain Gauge Resolution Modification to your OS hardware.
Post by: sam2004gp on December 19, 2008, 06:52:49 PM
Now that I have my rain gauge heater working, I thought I would tackle a modification to give me better accuracy to my rain gauge.  And of course I am attempting to do it as cheaply as possible, and without too much destruction to the gauge itself.

I will keep you guys posted with my progress in the coming days.  And I will try to keep a running total on cost.  I am hoping to do the final working install on Jan 1, 2009 as this is when I am resetting my rain numbers for the new year, and I would rather not screw up my numbers for 2008 so late in the game.

EDIT:  Here is the writeup, and my thoughts about installing it

1. Start off with attaining the needed parts, tools and materials.  You will need a funnel that has an opening to as close as you can get to 7 7/8 inches.  I found one that was 7 3/8 inches wide.  In fact I purchased two in case I screwed up the first or if I lose one to wind or something.  Mine came in a group of 3 funnels from my local Advance Auto Parts store(so now I have extras in the garage). You will need a sheet of cardboard, White Gloss spray paint for specifically plastic uses, a compass (not the kind to find direction, but the kind you used in elementary school to make circles and such.), some white or clear silicone sealant, a hack saw, 10lb fishing line, sandpaper, a black Sharpie, a hobby knife, and an accurate ruler. 
(http://i266.photobucket.com/albums/ii256/sam2004gp/weather%20station/Collection%20Modification/DSCN7023.jpg)
(http://i266.photobucket.com/albums/ii256/sam2004gp/weather%20station/Collection%20Modification/DSCN7025.jpg)
(http://i266.photobucket.com/albums/ii256/sam2004gp/weather%20station/Collection%20Modification/DSCN7027.jpg)
(http://i266.photobucket.com/albums/ii256/sam2004gp/weather%20station/Collection%20Modification/SANY0096.jpg)




2.  The original opening of the OS WMR-968 Rain Gauge Collection bucket is exactly 3 7/8 inches.  I chose to use my compass and trace a circle of about 1 7/8 inches radius or roughly 3 3/4 inches diameter onto the cardboard.  <<<--- In retrospect I recommend that you bring this number down to about 3 1/2 inches. 
Then take your hobby knife and cut out that circle.
(http://i266.photobucket.com/albums/ii256/sam2004gp/weather%20station/Collection%20Modification/DSCN7030.jpg)
(http://i266.photobucket.com/albums/ii256/sam2004gp/weather%20station/Collection%20Modification/DSCN7033.jpg)
(http://i266.photobucket.com/albums/ii256/sam2004gp/weather%20station/Collection%20Modification/DSCN7036.jpg)




3. Take the cutout sheet of card board and place it down over your funnel and trace the circle with the sharpie onto your funnel.
(I found this to be the best method to "calculate" where to find my "cut point" on the funnel.)
(http://i266.photobucket.com/albums/ii256/sam2004gp/weather%20station/Collection%20Modification/DSCN7037.jpg)
(http://i266.photobucket.com/albums/ii256/sam2004gp/weather%20station/Collection%20Modification/DSCN7040.jpg)




4. You can now use the hack saw and cut across the funnel, using your line as guide.  Then double check the above measurement using the ruler. <<<--- Again I recommend that you bring this number down to about 3 1/2 inches.   
(http://i266.photobucket.com/albums/ii256/sam2004gp/weather%20station/Collection%20Modification/DSCN7041.jpg)
(http://i266.photobucket.com/albums/ii256/sam2004gp/weather%20station/Collection%20Modification/DSCN7044.jpg)




5. Clean off the "burrs" left after cutting the funnel.  Clean the funnel of body oils and finger prints.  Place the funnel in a safe location outside and spray paint it to match the OS rain gauge.  As with any spray paint procedure, apply many thin coats between drying times rather than trying to cover it all at once.  Once the paint on the outside of the funnel has dried well (48 hours for me), flip it over and do it on the inside.  <<<--- I choose gloss paint that way when the rain drops hit the inside of the funnel they will be repelled better and force them down the funnel neck, rather than cling to the side.
(http://i266.photobucket.com/albums/ii256/sam2004gp/weather%20station/Collection%20Modification/DSCN7045.jpg)

...about the second or third coat
(http://i266.photobucket.com/albums/ii256/sam2004gp/weather%20station/Collection%20Modification/DSCN7047.jpg)





6.  Again once the paint has had time to dry (48 hours), you can attach your funnel to your rain gauge.  First, run a bead of the silicone sealant along the top edge of the rain gauge.  And place the funnel on the bead and rain gauge, while the sealent is still wet, adjust your funnel to make sure it is as level as possible.  Wait an hour or so for the sealent to set up a little bit.  then run a bead of sealent along the outside of the funnel, where the rain gauge and funnel meet.  Gently smooth this down with your finger, to fill in the gaps.  <<<<---- I choose the Silicone sealant because it will be easier to remove or replace in the future rather than a "more permanent" Crazy-Glue or adhesive option.
(http://i266.photobucket.com/albums/ii256/sam2004gp/weather%20station/SANY0090.jpg)




7.  If you use the factory supplied metal screen that came with your rain gauge, you can still use it.   All you have to do is sit it down inside the funnel.  It won't be an exact fit as before, but it does fit well.  While I was there I noticed that the string that was originally on the metal screen disingrated in my hands most likely from dry rot and the Sun's UV rays.  So to secure my screen from getting lost to a brisk wind gust, I used some 10lb fishing line to tie it to my rain gauge shelf, but still with enough slack in it so i could place it in or remove it from the new funnel.
(http://i266.photobucket.com/albums/ii256/sam2004gp/weather%20station/Collection%20Modification/SANY0093.jpg)
(http://i266.photobucket.com/albums/ii256/sam2004gp/weather%20station/Collection%20Modification/SANY0094.jpg)



8.  The Physical install is done, now time for the software changes.  (Assuming you are using VWS or other software which allows you to make calibration settings.) 

Now I will have the following Measurements, in regards to my NEW rainfall collection funnel for the OS-WMR968 station.

d=3 7/8 Inches (Original collection funnel size on the unmodified rain gauge.)
D=7 3/8 inches (The size of the NEW rain collection funnel)

So Again using the formulas posted later on in this thread and a little logic we get...
New Gain = (d / D)2     
...or me....
.2760 = (3.875 / 7.375)2

So I will enter into the VWS calibration window a gain of .2760
Be cautious that when you change this value it will alter any previous rain values you have recorded, so backup and write-down your rainfall data and prepare to edit those values.  If you are fortunate enough like me to do this a few days before the new year, this will be a great help.  In fact I am not going to change my gain value until 12:10 am on Jan 1st.  In that way I will not corrupt my rainfall totals for December and more importantly for 2008.

To get the new accuracy of resolution factor we do this math.
(Old Accuracy x New Gain)  or again in my case...
(.04 x .2760) = .01104

Which translates to that after every internal bucket/lever trip that occurs in my rain gauge.  I will record .011 inches of rain., instead of the original .04 inches of rain that occurred with the "Old" version of the rain gauge.


Enter your new gain here in VWS.
(http://i266.photobucket.com/albums/ii256/sam2004gp/weather%20station/Collection%20Modification/calibrationscreen.jpg)


9.  Congratulations, you are done.  Now for the "Bean Counters", here is my total cost on items, that I did not have around the house and had to purchase separately.  Your costs may vary.

Silicone Caulk (Sealent)                                 ---  $2.87
Compass (My 11 year olds was broke)          ---  $2.49
Funnel Set (2 Qty-$2.49 Each)                       ---  $4.98
+
Tax (5.0% rate in VA.)                                    ---  $0.51
----------------------------------------------------------------------
Grand Total                                                    ---  $10.86   


(http://i266.photobucket.com/albums/ii256/sam2004gp/weather%20station/Collection%20Modification/Receipts.jpg)
(http://i266.photobucket.com/albums/ii256/sam2004gp/weather%20station/Collection%20Modification/Recepit2.jpg)





I hope everyone finds this helpfull, maybe the mods will make it a sticky.
Title: Re: Cheap - Rain Gauge Resolution Modification
Post by: sam2004gp on December 19, 2008, 09:25:10 PM
I purchased a "new rain collection funnel" this afternoon.

So after doing some fancy math figuring........

and looking at the following link:
http://www.victoryseeds.com/weather/rainguage.html

...and Credit to WeatherBeacon for these formulas....
Quote
Here are the formulas for anyone who is interested. It's actually pretty straighforward and can be determined without using areas and without Pi.


Let d denote the inside diameter of the manufacturer's funnel (measured at the top).


Let Coarse denote the resolution of the manufacturer's rain gauge (0.04 inches for the OS, for example).


Let Fine denote the finer resolution you'd like from your modified collector (like 0.01 inches).


Then you need a funnel whose inside diameter D (measured at the top) is

       D  =  d * sqrt(Coarse / Fine)


Then set a gain in your station so that it knows each tip of the bucket now represents Fine inches of rain:

      Gain  =   Fine / Coarse.        This is the same as ( d / D )2.


Example:  Suppose your rain gauge has a resolution of 0.04 inches. Suppose the manufacturer's funnel measures 3.875 inches across the top (diameter). Suppose you want to modify the funnel to have a finer resolution of 0.01 inches. So

      d  =  3.875,    Coarse  =  0.04,    Fine  =  0.01,

and you need a new funnel whose inside diameter (across the top) is

      D  =  d * sqrt(Coarse / Fine)   =   3.875 * sqrt(0.04/0.01)  =  7.75 inches,

and you need to set a gain of

     Gain  =   Fine/Coarse  =  (0.01/0.04)  =  0.25

on your station.

Regards,

Kevin...

I will have the following Measurements, in regards to a new rainfall collection funnel for the OS-WMR968 station.

d=3 7/8 Inches (Original collection funnel size on the rain gauge, this was measured when I was installing my rain gauge heater mod, last weekend.)
D=7 3/8 inches (The size of the NEW rain collection funnel, I would of liked this to be 7 7/8 inches, but this is only funnel I could find that was close.)

So using some of the above formulas and a little logic we get...
New Gain = (d / D)2     
...or me....
.2760 = (3.875 / 7.375)2

So once I get everything installed my new gain that I will enter into the VWS calibration window will be .2760

To get my new accuracy of resolution factor we do this math.
(Old Accuracy x New Gain)  or again in my case...
(.04 x .2760) = .01104

Which translates to after my modifications are complete, that after every internal bucket/lever trip that occurs in my rain gauge.  I will record .011 inches of rain.

I did some prefab work this evening.  Tomorrow, if and when things dry up outside enough to set out the ladder I will do some more measuring and test installs.

Total Cost so far $7.85 with taxes.
......hmm, can I keep it under $20?
Title: Re: Cheap - Rain Gauge Resolution Modification
Post by: WeatherBeacon on December 19, 2008, 09:58:38 PM

Good figuring! Happy new rain gauge resolution!

I'm not familiar with the OS station, but I wonder if the console will only show increments of 0.01 inches (and not 0.011). I'm not sure if the OS station will actually record 0.011 inches and send that to VWS, though, or if it will just send increments of 0.01 inches to VWS.

After you install it and change your gain, in VWS click Settings > Precision and change Rainfall Value to 3 and see if it records increments of 0.011 inches.

Regards,

Kevin...
Title: Re: Cheap - Rain Gauge Resolution Modification
Post by: Anthony on December 20, 2008, 08:34:56 AM
The console it's self will still read in 0.04". Only VWS will calculate the 0.01". Hense the reason for (I believe it's the gain change) in VWS.
Title: Re: Cheap - Rain Gauge Resolution Modification
Post by: WeatherBeacon on December 20, 2008, 04:16:11 PM
The console it's self will still read in 0.04". Only VWS will calculate the 0.01". Hense the reason for (I believe it's the gain change) in VWS.

I see. That makes sense, Anthony.

Regards,

Kevin...
Title: Re: Cheap - Rain Gauge Resolution Modification
Post by: sam2004gp on December 20, 2008, 07:15:53 PM
Yep, Anothony is correct.  I did not get anything done on it today, because of holiday prep for my church.  Maybe get some tomorrow afternoon.
Title: Re: Cheap - Rain Gauge Resolution Modification
Post by: Anthony on December 21, 2008, 08:09:04 AM
You guys and your fancy mods are giving me to much work to do.

1 dig trench to weather station for power. (pant pant, puff, puff, gasp)
2. install heater mod.
3. do rain meaurement mod.

HELP!!!!!

Title: Re: Cheap - Rain Gauge Resolution Modification
Post by: sam2004gp on December 21, 2008, 08:22:49 AM
You guys and your fancy mods are giving me to much work to do.

1 dig trench to weather station for power. (pant pant, puff, puff, gasp)
2. install heater mod.
3. do rain meaurement mod.

HELP!!!!!


I would come and help Anthony, but then after seeing your set-up, I may want to head back home, and change more of my stuff, it is a never ending cycle.  Also I got the church play which I am in this morning, and then after that I spend the rest of the day at the inlaws. :roll: ](*,)  So my "Sunday Weather Station Tinkering Time" is already used up for today. :-(
Title: Re: Cheap - Rain Gauge Resolution Modification
Post by: SlowModem on December 21, 2008, 08:24:25 AM
If you were closer, I'd let you borrow my backhoe.   \:D/

(On second thought, I don't do toll roads.) :-P
Title: Re: Cheap - Rain Gauge Resolution Modification
Post by: sam2004gp on December 21, 2008, 08:29:06 AM
The console it's self will still read in 0.04". Only VWS will calculate the 0.01". Hense the reason for (I believe it's the gain change) in VWS.

....and since the OS does not show you the daily total for today until tomorrow, and the fact that you have to press the "rain" and "memory" buttons twice to see the Station total, I never even bother to look at the console for rain numbers any more.  I just watch it for temps, and those occasional wind gusts that you notice while passing by.
Title: Re: Cheap - Rain Gauge Resolution Modification
Post by: SlowModem on December 21, 2008, 08:50:48 AM

....and since the OS does not show you the daily total for today until tomorrow, and the fact that you have to press the "rain" and "memory" buttons twice to see the Station total, I never even bother to look at the console for rain numbers any more.  I just watch it for temps, and those occasional wind gusts that you notice while passing by.

That's exactly right.  The console is not very user-friendly.  However, it displays a lot more information at one time than other weather station consoles.  Like you, I just glance at it occasionally.  I have several monitors that display the information I want to see along with the trends.

Title: Re: Cheap - Rain Gauge Resolution Modification
Post by: Anthony on December 22, 2008, 07:56:54 AM
I'll get it all done on of these days. I could easily send my rain guage to sam or one of the others and let you do the heater mod and then send it back. The rain mod it fairly easy.

1 find 7-1/2" funnel
2 cut of tip.
3 afix to rain guage
4 add adjustment to vws

Title: Re: Cheap - Rain Gauge Resolution Modification
Post by: sam2004gp on December 23, 2008, 11:45:09 AM
Quick Update- Currently Spray painting new collection funnel.  More to come at a later day.
Title: Re: Cheap - Rain Gauge Resolution Modification
Post by: sbelmont on December 29, 2008, 03:07:03 PM
I found a 7 1/4" ID funnel and have my setup ready to change over New Year's day. That means my gain will be 0.285672. I'm not at home and have a question about entering the gain. How many decimal places will VWS take?
Title: Re: Cheap - Rain Gauge Resolution Modification
Post by: sam2004gp on December 29, 2008, 03:38:26 PM
I found a 7 1/4" ID funnel and have my setup ready to change over New Year's day. That means my gain will be 0.285672. I'm not at home and have a question about entering the gain. How many decimal places will VWS take?

I did a test gain adjustment last week, after I had just backed up by VWS directory, and I was able to enter it down to 4 decimal places or --->>>  0.1234  I think that should be accurate enough for any application since my website and VWS Desktop Display ony show 2 decimal places or --->>> 0.12

UPDATE: I also got mine final installed today.  I did it two days ahead because no precip is expected until friday and I wanted to give mine about 48 hours to set-up good before it gets wet.  Write-up to come soon.
Title: Re: Cheap - Rain Gauge Resolution Modification
Post by: sbelmont on December 29, 2008, 03:55:41 PM
Thanks Sam for the info.

I'm like you, no precipitation expected until Saturday. I just probably won't have time now until the 1st. I am going to use a substance called Goop for the glue and then put a bead of clear silicone around the edges. The Goop dries real fast, but the silicone will need a couple days.
Title: Re: Cheap - Rain Gauge Resolution Modification
Post by: sam2004gp on December 30, 2008, 10:49:28 AM

The writeup for the modification is done, re-visit the first post in this thread to see it. :grin: :grin: :grin:

Enjoy.....
Title: Re: Cheap - Rain Gauge Resolution Modification
Post by: W Thomas on December 30, 2008, 04:14:57 PM
You guys and your fancy mods are giving me to much work to do.

1 dig trench to weather station for power. (pant pant, puff, puff, gasp)
2. install heater mod.
3. do rain meaurement mod.

HELP!!!!!



Fortunately my service was already there as it feeds my outbuilding.. If it wasn't it just might be aerial :)
Title: Re: Cheap - Rain Gauge Resolution Modification
Post by: sbelmont on December 30, 2008, 05:38:43 PM
Nice write up Sam. I think I found the same funnel set as you at Home Depot. I need to check my measurement. I kept coming up with 7.25 ID not 7.375.
Title: Re: Cheap - Rain Gauge Resolution Modification
Post by: Anthony on December 31, 2008, 07:20:25 AM
Sam, Very nice job on the write up. But for future refference. It's better to make a new post than to go back and edit an old one like you did. It's easy for people to miss the edited post.

Title: Re: Cheap - Rain Gauge Resolution Modification
Post by: sbelmont on January 01, 2009, 11:52:21 PM
I made the same modification to my sytem today and I have a couple questions.

1) I'm using VWS V14. As far as I can tell the gain is only acurate to two decimal places. Is that correct or am I missing a setting someone to modify this?
2) The only rain related gain setting is for total rain. Will this also affect the Rain Rate?
Title: Re: Cheap - Rain Gauge Resolution Modification
Post by: sam2004gp on January 02, 2009, 11:04:47 AM
VWS Version 13 is also accurate to only 2 places for the gain setting.  I tried changing it to 4 places in "precision" settings menu, but all it did was add more places to my "Broadcast.jpg", and it did not change the "gain" accuracy value.  So I changed it back.  I just allowed the "new" gain setting to round up.  No other choice.  So then I calculated if I got a rain fall total of 30 inches for the year, and if the 4 decimal point accuracy was there.  In regards to year total again. I only read about .12 inches more of rain.  I am cool with that, considering there are always rain drops that never make it down the funnel and eventually evaporate.


I think Rain rate is calculated from the gain number and "bucket clicks" within a "specified time period", so by adjusting your gain, your rain rate also gets adjusted, so it should be "true".
Title: Re: Cheap - Rain Gauge Resolution Modification
Post by: sbelmont on January 03, 2009, 01:21:00 AM
Well. we just got our first precipitation of the year and the mod works perfectly. It was a slight shower and the station picked it up with the first reading as .01". My database looks like this:

9:00pm            243          0          0         89       45.5      28.91       0.01       45.5       51.0       42.5      29.95       55.6       36.3       0.01       0.01
9:05pm            263          0          0         90       45.3      28.91       0.01       45.3       51.0       42.6      29.95       55.6       36.3       0.01       0.01
9:10pm            221          4          4         91       45.3      28.91       0.01       43.1       51.1       42.9      29.95       55.6       36.3       0.01       0.01
9:15pm            216          0          5         92       45.1      28.91       0.01       45.1       51.1       43.0      29.95       55.6       36.3       0.01       0.01
9:20pm            214          0          0         92       45.1      28.91       0.02       45.1       51.1       43.0      29.95       55.6       36.3       0.02       0.02
9:25pm            245          3          4         93       45.0      28.91       0.03       43.6       51.0       43.1      29.95       55.6       36.3       0.03       0.03
9:30pm            176          0          4         93       44.8      28.91       0.04       44.8       50.9       42.9      29.95       55.6       36.3       0.04       0.04
9:35pm            216          0          4         94       44.8      28.91       0.05       44.8       51.0       43.2      29.95       55.6       36.3       0.05       0.05

The actual total right now is .054 inches. On wundergroud the rain rate went from 0.03 in/hr to 0.13 in/hr and then to 0.17 in/hr at the heaviest point. It seems pretty acurate for the little cell that moved through. I'm happy.
Title: Re: Cheap - Rain Gauge Resolution Modification
Post by: tomcj2 on January 03, 2009, 02:01:20 AM
Have you compared it with a CoCoRaHs type gauge? I was shocked at how inaccurate my VP2 is.
Title: Re: Cheap - Rain Gauge Resolution Modification
Post by: WeatherBeacon on January 03, 2009, 10:19:42 AM
Well. we just got our first precipitation of the year and the mod works perfectly. It was a slight shower and the station picked it up with the first reading as .01".....
The actual total right now is .054 inches. On wundergroud the rain rate went from 0.03 in/hr to 0.13 in/hr and then to 0.17 in/hr at the heaviest point. It seems pretty acurate for the little cell that moved through. I'm happy.

Awesome!
Title: Re: Cheap - Rain Gauge Resolution Modification
Post by: sam2004gp on January 03, 2009, 11:26:09 AM
Well. we just got our first precipitation of the year and the mod works perfectly. It was a slight shower and the station picked it up with the first reading as .01". My database looks like this:

9:00pm            243          0          0         89       45.5      28.91       0.01       45.5       51.0       42.5      29.95       55.6       36.3       0.01       0.01
9:05pm            263          0          0         90       45.3      28.91       0.01       45.3       51.0       42.6      29.95       55.6       36.3       0.01       0.01
9:10pm            221          4          4         91       45.3      28.91       0.01       43.1       51.1       42.9      29.95       55.6       36.3       0.01       0.01
9:15pm            216          0          5         92       45.1      28.91       0.01       45.1       51.1       43.0      29.95       55.6       36.3       0.01       0.01
9:20pm            214          0          0         92       45.1      28.91       0.02       45.1       51.1       43.0      29.95       55.6       36.3       0.02       0.02
9:25pm            245          3          4         93       45.0      28.91       0.03       43.6       51.0       43.1      29.95       55.6       36.3       0.03       0.03
9:30pm            176          0          4         93       44.8      28.91       0.04       44.8       50.9       42.9      29.95       55.6       36.3       0.04       0.04
9:35pm            216          0          4         94       44.8      28.91       0.05       44.8       51.0       43.2      29.95       55.6       36.3       0.05       0.05

The actual total right now is .054 inches. On wundergroud the rain rate went from 0.03 in/hr to 0.13 in/hr and then to 0.17 in/hr at the heaviest point. It seems pretty acurate for the little cell that moved through. I'm happy.
^^^----- =D&gt; \:D/

No rain for me yet, since I installed it.    :sad:
Title: Re: Cheap - Rain Gauge Resolution Modification
Post by: sbelmont on January 03, 2009, 11:35:10 AM
Have you compared it with a CoCoRaHs type gauge? I was shocked at how inaccurate my VP2 is.

No I haven't but it was something that crossed my mind last night. I am that type of person that likes accuracy...

As an update, we've had light showers all night. Except for one brief period at around 12:30 AM where it recorded at 0.02"/hr it has recorded .01" of rain just about every hour this morning. If you look at where I live, Bakersfield, CA, you would know that we do not get much rain. 5.28" is what I saw last calander year. I live in the foothills, so I get a little more precipitation than the valley floor does, but I am sure there were many light showers last year that I did not record any precipitation when I should have with better equipment.

You can check out my data on wunderground as I am not supporting my own web page at this time. My station ID is KCABAKER21.
Title: Re: Cheap - Rain Gauge Resolution Modification
Post by: sam2004gp on January 03, 2009, 11:43:51 AM
Just looked at you on wunderground, let me guess, new subdivision?, no house there, just a lot.
Title: Re: Cheap - Rain Gauge Resolution Modification
Post by: sbelmont on January 03, 2009, 12:19:53 PM
Just looked at you on wunderground, let me guess, new subdivision?, no house there, just a lot.

Golf course has been here since 84. My subdivision was created about 99. I bought the lot in 02 and moved in May of 04. When you look at sat pics you never know what year they are from. I have seen 3 different shots of my current lot. The one on Wunderground is the oldest. My guess is either 01 or 02.
Title: Re: Cheap - Rain Gauge Resolution Modification
Post by: killwilly on January 04, 2009, 08:54:13 AM
The satellite pictures on Google Earth are just as ancient, when I take a look at my house it shows a car on my drive which I sold in 2004!

Is it possible that they all use the same shots?
Title: Re: Cheap - Rain Gauge Resolution Modification
Post by: SlowModem on January 04, 2009, 09:04:33 AM
I've been at this address for 3 years now.  Yahoo maps show the house, google maps and terraerver do not.
Title: Re: Cheap - Rain Gauge Resolution Modification
Post by: sbelmont on January 04, 2009, 11:32:46 AM
The satellite pictures on Google Earth are just as ancient, when I take a look at my house it shows a car on my drive which I sold in 2004!

Is it possible that they all use the same shots?

No. I just did a simple test. Map.google.com shows the oldest sat picture of my house, from around 01 or 02. The same one wunderground uses. Maps.yahoo.com uses a newer sat picture. My house is built, but my neighbor's house is just a foundation, so it is from about 05.
Title: Re: How to make a Cheap - Rain Gauge Resolution Modification to your OS hardware.
Post by: aweatherguy on January 27, 2009, 11:43:35 PM
Hey, this is creepy! I embarked on an almost identical project -- right down to the automotive funnel!!!

Take a look at it here: http://wmrx00.sourceforge.net (http://wmrx00.sourceforge.net)

You will need to install the software to get at the user manual. You don't have to use the software but that's the only way to get the manual. Look in the appendix of the user's manual -- there's not as much detailed construction information but this is eerily similar. The only advantage to this idea is that it does not require gluing anything to the original rain gauge.

Also, the WMR100 software there is free and some may find it useful. If you look at the software, feel free to post comments on the Source Forge forum. You can find the forum on the Source Forge project page here: http://sourceforge.net/projects/wmrx00 (http://sourceforge.net/projects/wmrx00)


Title: Re: How to make a Cheap - Rain Gauge Resolution Modification to your OS hardware
Post by: Total on July 14, 2009, 05:39:15 AM
I found a 7 3/4 inch or 7.75 funnel - with the new funnel the vws reads .25 MM - sweet

(3.875 (old) / 7.75 (new funnel)) 2  = .25 offset ..  editted ( gain not offset )
Title: Re: How to make a Cheap - Rain Gauge Resolution Modification to your OS hardware
Post by: sam2004gp on July 14, 2009, 10:48:27 AM
I found a 7 3/4 inch or 7.75 funnel - with the new funnel the vws reads .25 MM - sweet

(3.875 (old) / 7.75 (new funnel)) 2  = .25 offset ..

Gain, not offset
Title: Re: How to make a Cheap - Rain Gauge Resolution Modification to your OS hardware.
Post by: DanS on July 14, 2009, 10:58:33 AM
I found a 7 3/4 inch or 7.75 funnel - with the new funnel the vws reads .25 MM - sweet

(3.875 (old) / 7.75 (new funnel)) 2  = .25 offset ..

Gain, not offset
I get 35.395 gain but what the hey, if it does what you want. \:D/
Title: Re: How to make a Cheap - Rain Gauge Resolution Modification to your OS hardware.
Post by: sam2004gp on July 14, 2009, 11:06:02 AM
I found a 7 3/4 inch or 7.75 funnel - with the new funnel the vws reads .25 MM - sweet

(3.875 (old) / 7.75 (new funnel)) 2  = .25 offset ..

Gain, not offset
I get 35.395 gain but what the hey, if it does what you want. \:D/

Dan you got to do the math in the correct order.

3.875 /7.75 = 0.5 then square that or the 2 or 0.5 x 0.5  ------ which then equals 0.25
Title: Re: How to make a Cheap - Rain Gauge Resolution Modification to your OS hardware.
Post by: DanS on July 14, 2009, 11:15:44 AM
I found a 7 3/4 inch or 7.75 funnel - with the new funnel the vws reads .25 MM - sweet

(3.875 (old) / 7.75 (new funnel)) 2  = .25 offset ..

Gain, not offset
I get 35.395 gain but what the hey, if it does what you want. \:D/

Dan you got to do the math in the correct order.

3.875 /7.75 = 0.5 then square that or the 2 or 0.5 x 0.5  ------ which then equals 0.25
It's getting late here and my brain cell is dwindling. I thought you got the area of each with squaring the radius x pi. Like for 3.875's radius 1.9375 x 1.9375 =  3.7539 * 3.143 = 11.798 do the same for the 7.75 and subtract to get the difference between the two? no?.
Title: Re: How to make a Cheap - Rain Gauge Resolution Modification to your OS hardware.
Post by: sam2004gp on July 14, 2009, 11:25:59 AM
Well we are not looking for the total area of collection, we are looking for the difference in the Gain from the original un-modified OS gauge to the New size circumference.  The current actual area of collection makes no difference, just the difference of the two area collection numbers.  So rather than doing a large amount of math on all of that it can be brought down to:

Quote
Now I will have the following Measurements, in regards to my NEW rainfall collection funnel for the OS-WMR968 station.

d=3 7/8 Inches (Original collection funnel size on the unmodified rain gauge.)
D=7 3/8 inches (The size of the NEW rain collection funnel)

So Again using the formulas posted later on in this thread and a little logic we get...
New Gain = (d / D)2    
...or me....
.2760 = (3.875 / 7.375)2

So I will enter into the VWS calibration window a gain of .2760
.............

To get the new accuracy of resolution factor we do this math.
(Old Accuracy x New Gain)  or again in my case...
(.04 x .2760) = .01104

Which translates to that after every internal bucket/lever trip that occurs in my rain gauge.  I will record .011 inches of rain., instead of the original .04 inches of rain that occurred with the "Old" version of the rain gauge.

OR

Quote
Here are the formulas for anyone who is interested. It's actually pretty straighforward and can be determined without using areas and without Pi.


Let d denote the inside diameter of the manufacturer's funnel (measured at the top).


Let Coarse denote the resolution of the manufacturer's rain gauge (0.04 inches for the OS, for example).


Let Fine denote the finer resolution you'd like from your modified collector (like 0.01 inches).


Then you need a funnel whose inside diameter D (measured at the top) is

       D  =  d * sqrt(Coarse / Fine)


Then set a gain in your station so that it knows each tip of the bucket now represents Fine inches of rain:

      Gain  =   Fine / Coarse.        This is the same as ( d / D )2.


Example:  Suppose your rain gauge has a resolution of 0.04 inches. Suppose the manufacturer's funnel measures 3.875 inches across the top (diameter). Suppose you want to modify the funnel to have a finer resolution of 0.01 inches. So

      d  =  3.875,    Coarse  =  0.04,    Fine  =  0.01,

and you need a new funnel whose inside diameter (across the top) is

      D  =  d * sqrt(Coarse / Fine)   =   3.875 * sqrt(0.04/0.01)  =  7.75 inches,

and you need to set a gain of

     Gain  =   Fine/Coarse  =  (0.01/0.04)  =  0.25

on your station.

Regards,

Kevin...
Title: Re: How to make a Cheap - Rain Gauge Resolution Modification to your OS hardware.
Post by: DanS on July 14, 2009, 11:33:35 AM
Gotcha..they say as you age your memory is the second thing to go. I'll bet a Bahama Mama would put the ol' attic back in order. #-o
Gotta go hit the sack, the mrs. is calling. later ...
Title: Re: How to make a Cheap - Rain Gauge Resolution Modification to your OS hardware.
Post by: sam2004gp on July 14, 2009, 11:38:06 AM
"...Knock out those dust bunnies."  ;)
Title: Re: How to make a Cheap - Rain Gauge Resolution Modification to your OS hardware.
Post by: Downlinerz2 on August 08, 2009, 10:20:55 AM
FYI:   I found a source for good funnels for this mod.  They are already white, they have vertical wall at the top, and they have a larger screen than usual. 

                 http://homebrewmart.com
   
                                  Mark
Title: Re: How to make a Cheap - Rain Gauge Resolution Modification to your OS hardware.
Post by: sam2004gp on August 08, 2009, 10:58:30 AM
FYI:   I found a source for good funnels for this mod.  They are already white, they have vertical wall at the top, and they have a larger screen than usual. 

                 http://homebrewmart.com
   
                                  Mark

I can't seem to track them down exactly, do you have a direct link?
Title: Re: How to make a Cheap - Rain Gauge Resolution Modification to your OS hardware.
Post by: Downlinerz2 on August 08, 2009, 11:24:27 AM
  Sam,
    Sorry.  Here is the most direct link I could get:

   1)   http://homebrew-supplies.homebrewmart.com/shared/storefront/default.asp?CS=hbm&storetype=BtoC&count1=537822902&count2=454963326&categoryID=30&target=products.asp
   2)On this page click on "Equipment"
   3) Go to page 2 of 8
   4) 8" funnel is at the bottom of the page

    (I could not get a link straight to the funnel page.  Sorry ](*,)
Title: Re: How to make a Cheap - Rain Gauge Resolution Modification to your OS hardware
Post by: Total on August 11, 2009, 09:13:36 PM
I found a 7 3/4 inch or 7.75 funnel - with the new funnel the vws reads .25 MM - sweet

(3.875 (old) / 7.75 (new funnel)) 2  = .25 offset ..

Gain, not offset
I get 35.395 gain but what the hey, if it does what you want. \:D/

Dan you got to do the math in the correct order.

3.875 /7.75 = 0.5 then square that or the 2 or 0.5 x 0.5  ------ which then equals 0.25

One final question . For MM is the gain still .25 ?? for my above #'s ..
Title: Re: How to make a Cheap - Rain Gauge Resolution Modification to your OS hardware.
Post by: Downlinerz2 on August 11, 2009, 09:54:33 PM
FYI:   I found a source for good funnels for this mod.  They are already white, they have vertical wall at the top, and they have a larger screen than usual. 

                 http://homebrewmart.com
   
                                  Mark

I can't seem to track them down exactly, do you have a direct link?
     Sam,
         Have you been able to find the funnels? 
Title: Re: How to make a Cheap - Rain Gauge Resolution Modification to your OS hardware
Post by: sam2004gp on August 12, 2009, 07:24:26 PM
I found a 7 3/4 inch or 7.75 funnel - with the new funnel the vws reads .25 MM - sweet

(3.875 (old) / 7.75 (new funnel)) 2  = .25 offset ..

Gain, not offset
I get 35.395 gain but what the hey, if it does what you want. \:D/

Dan you got to do the math in the correct order.

3.875 /7.75 = 0.5 then square that or the 2 or 0.5 x 0.5  ------ which then equals 0.25

One final question . For MM is the gain still .25 ?? for my above #'s ..

Yes your gain of .25 is correct.
Title: Re: How to make a Cheap - Rain Gauge Resolution Modification to your OS hardware.
Post by: sam2004gp on August 12, 2009, 07:25:12 PM

     Sam,
         Have you been able to find the funnels? 

Yes  I saw them, thanks. :-)
Title: Re: How to make a Cheap - Rain Gauge Resolution Modification to your OS hardware
Post by: Total on August 13, 2009, 04:54:57 PM
I changed my funnel AGAIN .. SIGH ... I noticed with the angle of the bottom of the old funnel , water drops would hang there and not travel into the rain gauge .. Much better now ..  The new funnel is exactly 7.75 inches .. 

We had a little shower come thru here this morning . after I checked and no more Water hanger anymore ..

(http://www.extremetesting.tv/2009_08130011.JPG) 
Title: Re: How to make a Cheap - Rain Gauge Resolution Modification to your OS hardware.
Post by: Strgazr27 on September 09, 2009, 01:09:53 PM
Absolutely the best mod for the OS unit. I'm hoping to add heat to mine this weekend. Winter isn't that far away  ](*,)
Title: Re: How to make a Cheap - Rain Gauge Resolution Modification to your OS hardware.
Post by: Downlinerz2 on September 09, 2009, 04:44:41 PM
Strgazr27,
    Looks really good =D&gt;!  I am probably going to have to wait until next spring.  There is a small chance might get it done the end of October.  Can't wait to get it done!!!
Title: Re: How to make a Cheap - Rain Gauge Resolution Modification to your OS hardware.
Post by: stevebrtx on September 21, 2009, 10:38:33 AM
My funnel is waiting in TX, I won't get it up until late Oct so will miss this rainy season, but I'll be ready for next year when it starts in June for sure. I even opted for a little rain gauge shelf to go with the new OS200. I'll have to see how to stabilize the unit to be sure it doesn't wiggle, currently mine is "attached" to the solar collector and when the pool kicks in it vibrates enough to cause the buckets to tip if there is residual water from a previous shower so you get a .04" bump at 11am when it's sunny bright even though the rain quit at 4am.
Title: Re: How to make a Cheap - Rain Gauge Resolution Modification to your OS hardware.
Post by: mblanton on October 08, 2009, 10:11:44 PM
I've got the paint on my funnel drying. Can anyone tell me specifically which files in my WMR-968 console and VWS software do I need to edit?
Title: Re: How to make a Cheap - Rain Gauge Resolution Modification to your OS hardware.
Post by: Downlinerz2 on October 08, 2009, 10:31:38 PM
   I think all of the changes are noted on the first page of this thread. You just have to put a gain into the VWS.  Amount depends on the size of your funnel.
     MG
Title: Re: How to make a Cheap - Rain Gauge Resolution Modification to your OS hardware.
Post by: mblanton on October 09, 2009, 07:14:30 AM
I meant which files do you have to edit after you make the change?  I thought someone said that editing the gain would change the rainfall values stored somewhere??? Which files contain the rainfall data that has to be edited??

Title: Re: How to make a Cheap - Rain Gauge Resolution Modification to your OS hardware.
Post by: mackbig on October 09, 2009, 07:40:39 AM
no files to edit.  You input a gain in calibration.  See post on, it has all the math and screen caps where to enter the gain number.
Andrew


I meant which files do you have to edit after you make the change?  I thought someone said that editing the gain would change the rainfall values stored somewhere??? Which files contain the rainfall data that has to be edited??


Title: Re: How to make a Cheap - Rain Gauge Resolution Modification to your OS hardware.
Post by: sam2004gp on October 09, 2009, 08:46:12 AM
I've got the paint on my funnel drying. Can anyone tell me specifically which files in my WMR-968 console and VWS software do I need to edit?

I hope your paint is for plastic.  We had a 30 mph wind that stripped most of my paint off a few days ago.  I bought plastic paint last night, and I am going to scuff up the surface a bit.  My only problem is they are calling for rain this weekend.  I would like a good 2 days of clear weather so I can remove it from it's mount, clean it up, paint it, dry time, and re-install.
Title: Re: How to make a Cheap - Rain Gauge Resolution Modification to your OS hardware.
Post by: sam2004gp on October 09, 2009, 09:01:39 AM
I meant which files do you have to edit after you make the change?  I thought someone said that editing the gain would change the rainfall values stored somewhere??? Which files contain the rainfall data that has to be edited??



If he changes his gain, mid year, it will mess up his total rain number.  

Thus do it like this.
1. Write-down your rain amount for the year so far, and the month so far.
2. Enter your new gain value.
3. Observe what VWS "thinks" is now your new rainfall for the year value.
4. Your Offset correction will be the Actual rain number (1) minus the number in (3) above.
5.  Go to your calibration settings.  If your rain "offset" is 0.00 then enter the number from 4.
6.  If your rain "offset" is NOT 0.00 then take what the current number and add 4 to it.  What you are wanting to do is basically get VWS rainfall total number back to where it was before you changed the gain.  
7.  Give things a minute to settle then observe your rainfall for the month amount.  If this is incorrect, then go and adjust the month and day value in the "rainfall montly/yearly" settings menu to reflect what they should be.
8.  After this process is complete.  Shutdown VWS, and restart it.  Don't be alarmed if VWS's graphs/gauges for rain seem goofy.  These will clear up after the information scrolls off of the appropriate display.  The important thing here is again that your yearly rain and monthly rain match what they were from before, and you have your new gain factor entered in as well.

Another word of advice for the end of the year.
At 11.58PM on Dec 31 shut down VWS.  Restart VWS at 12:02am on Jan 1st.  Wait 5 minutes, then Shutdown VWS again.  On your OS WMR968 reset/clear the memory for your rainfall total.  Restart VWS, go to the calibration settings and change your offset to "0.00".  Allow VWS to settle, shutdown one more time and restart it.   ----  This will effectively start your rain totals over for the new year without destroying rainfall total in the data files from the old year.  Plus if you need to ever adjust the values for rain gauge maintenance reasons in the new year, it will make it easier to do the math since the rainfall number in your OS WMR-968 will be a little easier to understand then.
Title: Re: How to make a Cheap - Rain Gauge Resolution Modification to your OS hardware.
Post by: killwilly on October 10, 2009, 02:38:07 AM
Thanks for your last post Sam. I think your year end advise is useful, whether you have the modification or not.  =D&gt;

Alan.
Title: Re: How to make a Cheap - Rain Gauge Resolution Modification to your OS hardware.
Post by: sam2004gp on October 10, 2009, 05:45:53 PM
Thanks for your last post Sam. I think your year end advise is useful, whether you have the modification or not.  =D&gt;

Alan.
No problem Alan. 
Rainfall entry in VWS, I think is the most confussing thing about the whole program.  It's taken me about 2 years, but I just about got it figured out. :-)   
.....I think.  #-o ](*,)
Title: Re: How to make a Cheap - Rain Gauge Resolution Modification to your OS hardware.
Post by: mblanton on October 10, 2009, 07:55:46 PM
I got a can of Krylon brand Gloss White spray paint.  It is supposed to be for plastic, wood, or metal and indoor/outdoor use....will see how well it holds up.  I may cover that with a clear coat for added protection.  I found an aluminum funnel at my local hardware store that was exactly 8 inches.  If I've done the math correctly that works out to a gain of 0.2346 and each bucket tip will add .0093847 inches of rain to my total. Since CWOP only tracks rain to the nearest .01 inch is there any point in increasing the precision of the rain measurement number recorded in my VWS software to 3 or 4 digits?
Title: Re: How to make a Cheap - Rain Gauge Resolution Modification to your OS hardware.
Post by: sam2004gp on October 10, 2009, 09:18:41 PM
No need to change the precision settings, they are actually for display purposes only.  The precise number will still be there. VWS will just round the numbers for you anyways when displaying it and using the regular precision settings. 

When entering your gain number into VWS round up to the TWO decimal places.  I calculated my potential for "rounding errors" in allowing VWS do this and over the year it did not make much of a difference.

Take a look at this post again.  http://www.wxforum.net/index.php?topic=2738.msg21371#msg21371
Title: Re: How to make a Cheap - Rain Gauge Resolution Modification to your OS hardware.
Post by: stevebrtx on October 22, 2009, 09:54:15 AM
Finally got my 8" funnel retrieved from TX, I got the one from the beer equip supply and it's great with a built in screen and a couple of "ears" at the top rim which are convenient for stabilizing it back to the support pole. Even popped for a shelf for the new gauge and installed it yesterday, we had enough drizzle to test the .01" increment and it works, now we'll be ready for the rainy season next June.

http://www.homebrewmart.com/ (http://www.homebrewmart.com/) and search for "funnel". It's $5.95 plus shipping.
Title: Re: How to make a Cheap - Rain Gauge Resolution Modification to your OS hardware.
Post by: sam2004gp on October 22, 2009, 10:15:32 AM
Congrats, it's the best cheapest mod you can do.  =D&gt; \:D/
Title: Re: How to make a Cheap - Rain Gauge Resolution Modification to your OS hardware.
Post by: killwilly on November 29, 2009, 07:58:40 AM
Sam.

Towards the end of your instructions for the rain gauge conversion, you show a photograph of the calibration box in VWS. You have highlighted in red where to install the gain calculation. Next to that there is a figure of 4.14 in the offset box. At the end of year when you shut down VWS and reset the base station, do you have to remove that offset figure, or is it automatically zeroed?

Alan.
Title: Re: How to make a Cheap - Rain Gauge Resolution Modification to your OS hardware.
Post by: sam2004gp on November 29, 2009, 08:16:17 AM
Yes, at the end of the year if you reset your base station you will also have to change that offset value back to zero, manually.   I usually shut down everything at 11:50PM New Years Eve, backup the VWS folder, Reset the console, relaunch VWS at about 12:05AM New Years, clear the offset, shut down VWS, and restart VWS one more time.  Then all should be good.
Title: Re: How to make a Cheap - Rain Gauge Resolution Modification to your OS hardware.
Post by: killwilly on November 29, 2009, 08:41:43 AM
Yes, at the end of the year if you reset your base station you will also have to change that offset value back to zero, manually.   I usually shut down everything at 11:50PM New Years Eve, backup the VWS folder, Reset the console, relaunch VWS at about 12:05AM New Years, clear the offset, shut down VWS, and restart VWS one more time.  Then all should be good.

Thank you kind sir.  :grin:

Alan.
Title: Re: How to make a Cheap - Rain Gauge Resolution Modification to your OS hardware.
Post by: pvw on February 17, 2011, 08:05:55 PM
At the risk of resurrecting an old thread, I just have to say that this mod has worked out quite well for me.  Over the last couple of precipitation events I've had, my manually collected CoCoRahs readings and the OS bucket gauge have tracked very closely, to 1/100 of an inch.
Title: Re: How to make a Cheap - Rain Gauge Resolution Modification to your OS hardware.
Post by: sam2004gp on February 17, 2011, 08:54:40 PM
I am glad people are still finding it useful.
Title: Re: How to make a Cheap - Rain Gauge Resolution Modification to your OS hardware.
Post by: skysummit on February 17, 2011, 09:30:22 PM
Thanks for resurrecting this thread!  This may be something to do over the coming weekends while our weather is quiet down here.
Title: Re: How to make a Cheap - Rain Gauge Resolution Modification to your OS hardware.
Post by: pvw on February 19, 2011, 09:03:18 PM
Well, Yesterday (Recorded at 7:00am this morning), I recored 3.3 inches of snow with a moisture content of .24".

It had stopped snowing by the time I took my CoCoRahs reading.

Since it was below freezing last night and this morning, of course the OS didn't record anything until the melt started today. 

It just apparently finished the melt and my OS Rain gauge recored .24" of rain...

Couldn't be happier with this resolution mod...
Title: Re: How to make a Cheap - Rain Gauge Resolution Modification to your OS hardware.
Post by: aweatherguy on February 20, 2011, 07:16:58 PM
In my opinion, the WGR800 rain gauge is probably the best piece of equipment in the OS sensor lineup. I've done a lot of testing at different simulated rainfall rates, and it delivers surprisingly consistent and accurate results for rates as high as 4 inches/hour (that's with the funnel attachment). I frequently compare my gauge with a Stratus manual gauge (the CoCoRHaS unit) and it always comes out within +-1%, +-0.01 inch.
Title: Re: How to make a Cheap - Rain Gauge Resolution Modification to your OS hardware.
Post by: BaronV on July 03, 2011, 07:01:51 PM
Since the gain measurements are only implemented on the PC dosent that mean that the rainfall measurements displayed on the console will now be completely wrong?

Alternatively since increasing the funnel size simply increases the amount of water falling into the rain gauge, not how much water is required to tip the bucket, shouldnt it mean that actually you dont need to implement the gain setting at all since the bucket will just tip more often?
Title: Re: How to make a Cheap - Rain Gauge Resolution Modification to your OS hardware.
Post by: sam2004gp on July 03, 2011, 10:50:35 PM
Yes the console is no longer accurate, but most folks on here use a computer to display their data.

 As for the funnel change.  By adding it, you are increasing the collection area by 4-fold, therefore the lower gain takes up for that.  But the Original OS gauge would only had an accuracy of .04 on it's original size bucket, so by increasing the collection area and reducing the gain proportionatly, mathematically you increase the accuracy of the gauge to read within .01.  I have been using this method since this thread was started and compared with other gauges and is very accurate even during storm downpour situations.

So basically if you increase the collection by 4, and yet it rains .01 it will read in VWS as .04 unless you implement a gain of .25 to bring it back to the .01.
Title: Re: How to make a Cheap - Rain Gauge Resolution Modification to your OS hardware.
Post by: BaronV on July 04, 2011, 06:10:43 AM
okay I think I understand now. Its a simple case of multiply and divide. What I dont get though is dosent the bucket tip when about 0.4 inches (average) rain fall into it? Or is it saying that an equivalent of 0.4 inches of rain have tipped.
Title: Re: How to make a Cheap - Rain Gauge Resolution Modification to your OS hardware.
Post by: sam2004gp on July 04, 2011, 08:36:48 AM
Yes, since the bucket tips at .04.  But if you have increased the collection area by 4 so therefore an actual .01 rainfall is collected in the tip buckets as an .04 then the gain must be readjusted to 0.25 so the software makes the correct recording. 

The only other way to change resolution is to change the size of the tip bucket, and of course that is beyond our capability to do that with this OS hardware.
Title: Re: How to make a Cheap - Rain Gauge Resolution Modification to your OS hardware.
Post by: zoomx on October 11, 2020, 06:00:06 AM
All images are unavailable today. Someone has a backup of them?
Title: Re: How to make a Cheap - Rain Gauge Resolution Modification to your OS hardware.
Post by: sam2004gp on October 11, 2020, 01:21:49 PM
Yes, they are still available on my website. 

www.mountcrawfordweather.org (http://www.mountcrawfordweather.org)

or specifically

http://www.mountcrawfordweather.org/Weather Station Photos/Rain Gauge Collection Improvement Modification/photo.html (http://www.mountcrawfordweather.org/Weather Station Photos/Rain Gauge Collection Improvement Modification/photo.html)
Title: Re: How to make a Cheap - Rain Gauge Resolution Modification to your OS hardware.
Post by: zoomx on October 13, 2020, 02:20:04 AM
Thank you very much!