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How the station evaluates wind data? - WH65, WS80, WS68

January 11, 2021, 7:35 am
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Hi!

I am currently trying to understand how the wind sensors work and how they are evaluated by the stations ...

There are different values regarding the wind and the gusts, which are output to the weather services as well as via custom server (or will be made available via API-access for the GW1000):

winddir
windspeedmph
windgustmph
maxdailygust
(winddir_avg10m)1
(windspdmph_avg10m)1

Communication takes place at two different intervals:
The sensor reports the data to the station (e.g. GW1000 or HP2551C) in the sensor interval and the station to the configured weather services (Ecowitt, WU, WC, WOW, custom server) at an independent station interval.

The WH65 has a transmission interval of 16 seconds, the WS68 16.5 seconds and the WS80 4.8 seconds - so these sensors send the values ​​to the station every 16, 16.5 or 4.8 seconds.

But if the transmission interval of the GW1000/HP2551C (station interval) is significantly higher than the transmission interval of the anemometer (sensor interval) - e.g. 60 seconds - which values ​​are actually output or sent by the station?
Is only the last value sent by the sensor output or is an average calculated from all the values ​​available from the sensor within the station interval?
So does the sensor overwrite the value in the station every time it sends? Or will there a list (array) created in which any number of values ​​can be added and from which an average is calculated and output if next station interval is reached?

Does anyone already have information? Otherwise I'll ask Lucy about ...

Thanks, Oliver

1: not available for GW1000 but for HP2551C
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Ecowitt HP2551 WiFi Weather Station temperature accuracy

January 11, 2021, 7:54 am
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I am considering buying the HP2551 WiFi Weather Station. I'm wondering about the temperature accuracy when the sun is shining on it?

I have an older weather station which I am going to replace. Even though the temp sensor has a shield it still reads much higher than it is supposed to when the sun beats down on it. Will this be a problem with the HP2551?
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Re: Ecowitt HP2551 WiFi Weather Station temperature accuracy

January 11, 2021, 9:07 am
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Re: Ecowitt HP2551 WiFi Weather Station temperature accuracy

January 11, 2021, 9:18 am
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Depends on whether the OP is referring to internal or external temperature readings!
If external then the sensor is meant to be in the sunshine to work properly, though the radiation screen is not fantastic so there is a element of variability in the stock readings in mid summer.

If you are serious in your weather data you can buy a WH32 or WH32-EP which are separate and a higher precision (EP model) temp/humidty external sensor that you can place in your own radiation shield as some of us have done. However in reality you are talking a degree or two C in terms of accuracy so not boatloads.

For the internal sensor then you should avoid placing the stick sensor where the sun shines on it to be accurate as it does not have a screen to protect it.
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Re: How the station evaluates wind data? - WH65, WS80, WS68

January 11, 2021, 10:14 am
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I have not done any testing on this but I do remember asking Fine Offset (before Ecowitt existed) about this. The response I got is that at least in regards to the WH65 is that in the 16 second data broadcast, the sensor sends the average of that 16 second interval as the wind speed and the max during that 16 seconds as the gust. But what the console GW1000 or HP2551 decides to do with that could then change and I do not know the answer. As for the newer sensors that came out after the WH65 like the WS80 and the WS68 ...I have no idea.

I think this could be something that could also be answered by anyone that is doing RTL-SDR / RTL_433. Then you could compare what the raw sensor sends to what the consoles shows.
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Re: Ecowitt HP2551 WiFi Weather Station temperature accuracy

January 11, 2021, 10:37 am
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Quote from: Mandrake on Today at 12:18:45 PM
Depends on whether the OP is referring to internal or external temperature readings!
Oh yeah #-o sorry @canlab I was talking indoor HP2551-C console itself being in sun obvs, as opposed to outdoor sensor packages connecting to it. I used to have a WH2910C which did have this internal issue as the internal THP sensor was in the main console unit (and black) and on my sunny window shelf initially.
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UK to ban Chinese imports

January 11, 2021, 10:49 am
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The UK is set to ban Chinese imports (exports possible too) that are linked to forced labour.

I'm not for one moment insinuating that the weather stations we import are put together in forced labour camps, but I suspect it may cause a lot of problems purchasing directly from there, as well as Banggood, eBay, Amazon etc

It could spell the end of it though.
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Re: UK to ban Chinese imports

January 11, 2021, 12:24 pm
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I think this relates to the cotton trade

Not sure its a ban, more a direction to UK firms to perform due diligence on their supply chain
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Re: WH31B not connecting to GW1000

January 12, 2021, 5:12 am
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Thanks!

I have dip switches for changing the channel. Whichever channel I configure via the dip switches reflects on the LCD. I think that indicates this is a WH31B rather than a WH32B, right?
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Re: WH31B not connecting to GW1000

January 12, 2021, 5:29 am
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Yes. But it probably isn't a WH31B, as Ambient has stopped selling those and now they are all WH31E. The WH31B and WH31E are the same thing except for the WH31E has an extra function which is an RCC. But that RCC does nothing for your station. The RCC is only used for the WS-3000 and perhaps some other smaller displays that don't connect to the Internet for time synchronization.
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Re: WH31B not connecting to GW1000

January 12, 2021, 6:08 am
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Good to know! I bought mine from Amazon, I wonder if they have some older stock...

I have started the return process after leaving the sensor out all night and it not connecting. Here's hoping the next one works like the other 2 did.
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Re: GMT/BST change

January 12, 2021, 6:51 am
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Quote
Do I need to do anything in CumulusMX?
No, you do not need to do anything in CumulusMX for start of daylight savings time and restart of standard time. 
For daylight saving beginning date the log file will have one hour "time" missing (but all the data at whatever interval you have set will continue to be logged with the new times), i.e. with 10 minutes log interval, at the last log entry at 2:00 am the next entry will be at 3:10 am, etc.
At restart of standard time the log file will have duplicate time entries for the first hour of the time change (so all the data continues to be logged) - i.e. the last log entry at 2:00 am and the next log entry will be 1:10 am time, etc.


Enjoy,
Paul
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Re: GMT/BST change

January 12, 2021, 7:09 am
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Quote from: PaulMy on Today at 09:51:09 AM

Quote
Do I need to do anything in CumulusMX?
No, you do not need to do anything in CumulusMX for start of daylight savings time and restart of standard time. 
For daylight saving beginning date the log file will have one hour "time" missing (but all the data at whatever interval you have set will continue to be logged with the new times), i.e. with 10 minutes log interval, at the last log entry at 2:00 am the next entry will be at 3:10 am, etc.
At restart of standard time the log file will have duplicate time entries for the first hour of the time change (so all the data continues to be logged) - i.e. the last log entry at 2:00 am and the next log entry will be 1:10 am time, etc.


Enjoy,
Paul

Many thanks

All very logical
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Re: GW1003, how can i get the heater cable by USB?

January 12, 2021, 9:37 am
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Hi
maybe I can bring some enlightenment into the discussion here.

I just received my official power supply from Ecowitt (for the WS80).

Have a look at the pictures. From there probably some of the earlier assumptions in this thread might be proven inaccurate (e.g. Voltage).
The official power supply provides 12 V at 1.0 A.

 [ You are not allowed to view attachments ]

below a side view on the connector to the cable which goes to the WS80
 [ You are not allowed to view attachments ]

Maybe that and the fact that it's a IP68 device for outdoor use, which means it can be permanently under water up to 1.5 meters depth, gives some indication for the higher pricing.
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Re: GW1003, how can i get the heater cable by USB?

January 12, 2021, 10:12 am
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Nice Gyvate! That does answer a lot of questions.

It's an isolated power supply so actually it won't be easy to check which is +12VDC or -12VDC since it's a floating system. This may be the reason why Ecowitt changed from a USB power supply (ground referenced) to one with galvanic separation so you would need two insulation failures for improved safety.

Looks like it might be a fully sealed unit. Even though it's IP68, the duration is not specified and per IEC standards that's up to the manufacturer. It likely not permanent immersion but some considerable amount of time since it's rated for the outdoors.

Do you have a photo for the print on the DC wires to the WS80? Curious to see what the wire sizes were. I can see the incoming cable is 2C-18AWG (0.75mm2).

Also if you have a closer photo of the power supply label I am curious to know what certification markings it has. Looks like TUV GS (German approval) along with CCC (Chinese approval) on the cable jacket.
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Re: GW1003, how can i get the heater cable by USB?

January 12, 2021, 10:44 am
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Quote from: solartempest on Today at 01:12:29 PM

Do you have a photo for the print on the DC wires to the WS80? Curious to see what the wire sizes were. I can see the incoming cable is 2C-18AWG (0.75mm2).

Also if you have a closer photo of the power supply label I am curious to know what certification markings it has. Looks like TUV GS (German approval) along with CCC (Chinese approval) on the cable jacket.
On the power cable it says: (very difficult to take a photo of it, by the way ... :roll: )

<VDE> 40052148 H05RN-F 300/500V 2x0.75mm2 CE SAA-192830-EA Dongguan Wandu Cable Co.,Ltd. CCC A125847 60245 IEC 57(XYZ) 300/500V 2x0.75mm2 2020010104277500 GB/T5013.4-2008/IEC 60245-4:2004

VDE stands for:  Verband der Elektrotechnik Elektronik Informationstechnik  (German Association of Electrical, Electronic & Information Technologies, a Europe-wide and even inter-continental association for standards, testing etc. in that area)

Enjoy that string ... :lol:

Difficult to provide a bigger photo - don't have a macro objective - but you can right-click on the picture - select view image - and then magnify it in the browser (in my Firefox it is CTRL+)

But in written, the certifications are: TÜV, GS, CE, SELV and this circle with two horizontal lines in the upper half and a square in a square.
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Re: WS-2000 error

January 12, 2021, 11:03 am
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If you want to know what is what on the WS-2000/5000 console screen/display (or on the HP2551 console), have a look at

https://www.wxforum.net/index.php?topic=40730.msg420959#msg420959

We created that picture in order to have a clear reference and understanding  :grin:

Then we clearly know what we are talking about.  :-)

And - the signal on the top left is the WH32 - not the WH32B - the WH32B shows at three other places.
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Re: GW1003, how can i get the heater cable by USB?

January 12, 2021, 11:11 am
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Is the labelling the same for the wire with the 2 pin connector going to your WS80? It should be even smaller print.  :shock: I can relate because reading print on the sides of these things is always a chore.

The string is good information regardless. It's a rubber insulation of type H05RN-F which is UV resistant, oil resistant, flame retardant, and flexible down to -25C. Size is as I mentioned earlier, 2x18AWG.

The square-inside-a-square means Class II power supply. It typically means double insulated for safety of people against electric shocks. The shield symbol means fail-safe transformer. The +/- with circle likely means safety isolation. Above that looks like a NPN junction symbol. No idea what the circle with the two lines in it means.

I'm surprised it has all these European certifications and nothing North American. Regardless, most people won't really care what all this means. Overall it is just saying this is much safer than using a simple indoor USB power supply spliced onto the heating circuit (which is what the original manual depiction may have implied).
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Re: GW1003, how can i get the heater cable by USB?

January 12, 2021, 11:17 am
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Quote from: solartempest on Today at 02:11:51 PM

I'm surprised it has all these European certifications and nothing North American. Regardless, most people won't really care what all this means. Overall it is just saying this is much safer than using a simple indoor USB power supply spliced onto the heating circuit (which is what the original manual depiction may have implied).
I guess they have a different model for the North-American continent.
The plug there is different (by the way in the UK too).
Maybe there's a different label on the supply box for North America.
We will know once someone from there gets themselves one.
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Re: GW1003, how can i get the heater cable by USB?

January 12, 2021, 11:25 am
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Quote from: Gyvate on Today at 02:17:30 PM
I guess they have a different model for the North-American continent.  The plug there is different (by the way in the UK too). Maybe there's a different label on the supply box for North America. We will know once someone from there gets themselves one.
Good point!

If the WH45 isn't offered on on Amazon Canada, I might have to order one of these heater supply cables too because I would be ordering directly from Ecowitt. Already convinced my wife last week that a WH45 is good idea and this power supply looks to be better than anything I would easily put together.  [tup]

Really interested to see how you like using the heater plate in snow and icy conditions. I was sad to give up meaningful wind data for this time of year.
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