Author Topic: New Stuff - Ecowitt Has the Newest Fine Offset Hardware  (Read 58432 times)

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Offline Mandrake

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Re: New Stuff - Ecowitt Has the Newest Fine Offset Hardware
« Reply #325 on: August 23, 2019, 03:37:43 AM »
yep, essential as it seems since temperature directly impacts the speed of sound through air.
The following taken from Manchester universities (UK) website:

Sonic anemometers provide fast and accurate measurements of three dimensional wind speed and are widely used by the Centre for Atmospheric Science to make both routine wind and detailed turbulence measurements. These instruments are able to make wind speed measurements over the range 0 – 60 m/s, with a resolution of 1 cm/s at rates up to 100Hz. This speed and resolution allows turbulent structure on scales of a few cm to be resolved.

Sonic anemometers operate by measuring the time taken for a pulse of sound to travel between a pair of transducers. This time depends on the distance between the transducers, the speed of sound and the air speed along the axis of the transducers as follows:

T = L/(c+v)

Where T is time, L is the distance between transducers, c is the speed of sound, and v is the air speed along the transducer axis.

The speed of sound in air is dependant on temperature, pressure and suspended contaminants such as dust and fog. In order to obtain the air speed between the transducers, each transducer alternates as transmitter and receiver so that pulses travel in both directions between them. The air speed is calculated from the pulse times in each direction as follows:

v = 0.5L(1/t1-1/t2)

The speed of sound, from which an estimate of air temperature may be derived may be calculated from the pulse times as follows:

c = 0.5L(1/t1+1/t2)

By arranging three pairs of transducers on three different axis, three dimensional wind speed and hence direction and wind angle is obtained.

Due to the high sensitivity of sonic anemometer measurements, measurements will be affected by small flow distortions caused by the airflow past the transducers and their supporting struts. There are various designs of anemometer head which attempt to minimise such flow distortions. Additionally most manufacturers perform careful wind tunnel calibrations and automatically implement a direction dependant correction for any distortion which does occur.

Sonic anemometers are able to operate in most conditions experienced in the atmosphere, however heavy rain affects data quality from some models as water droplets on the transducers significantly effect pulse times. This problem is generally minimised by checking the signal quality of received sonic pulses and rejecting those with poor signal quality. Additionally if ice builds up on the transducers measurements are similarly affected. In order to overcome this problem some models are fitted with anti-ice heating.
G1ZFO

Ecowitt HP2551A + WH65 Tri-Wing (Wunderground: IGUILDFO67)
Ecowitt GW1000 (Wunderground: IGUILDFO68)
Ecowitt GW1000 (Mk2) test environment driving CumulusMX on a RPi 3b
Ecowitt GW2000 (Test)
Ecowitt WS90 Wittboy - Test
Ecowitt WH51 (x6) Soil Moisture Sensor
Ecowitt WH41 PM2.5 AQM Sensor
Ecowitt WH31 (x8) Thermo/Hygro Sensor
Ecowitt WS80 Ultrasonic Anemometer (pre-prod test)
Ecowitt WH57 Lightning Sensor -test
Ecowitt WH32-EP (SHT35) + Davis 7714 Screen
Ecowitt WH45 CO2/PM2.5/PM10 -Test
Ecowitt WN34 Soil Temp Sensor -Test
Ecowitt WN34 Water Temp Sensor -Test
Ecowitt WN35 Leaf Moisture

Offline WA4OPQ

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Re: New Stuff - Ecowitt Has the Newest Fine Offset Hardware
« Reply #326 on: August 23, 2019, 12:46:48 PM »
I wanted to get an understanding of the magnitude of the change of the speed of sound as temperature changes. Using a calculator from the NWS El Paso office, it looks like a temperature change from 70F to 100F gives a 3% change to the speed of sound. (This may explain why the WS-80 has an integrated temperature sensor)

https://www.weather.gov/epz/wxcalc_speedofsound

Offline WA4OPQ

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Re: New Stuff - Ecowitt Has the Newest Fine Offset Hardware
« Reply #327 on: August 23, 2019, 01:04:32 PM »
WS80 temperature is used to compensate for wind speed calculation.If you are concerned that his temperature is not accurate, you can purchase a separate hygrometer WH32 to replace the temperature and humidity of WS80.

Yes, this sounds logical. However, the firmware of the GW1000 or console has to be able to ignore the temp data from the WS-80 and substitute the data from the WH32 (Ambient did this with the WS-2000 firmware 1.3.5)
Maybe the GW1000 already does this.

Offline galfert

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Re: New Stuff - Ecowitt Has the Newest Fine Offset Hardware
« Reply #328 on: August 23, 2019, 01:32:54 PM »
WS80 temperature is used to compensate for wind speed calculation.If you are concerned that his temperature is not accurate, you can purchase a separate hygrometer WH32 to replace the temperature and humidity of WS80.

Yes, this sounds logical. However, the firmware of the GW1000 or console has to be able to ignore the temp data from the WS-80 and substitute the data from the WH32 (Ambient did this with the WS-2000 firmware 1.3.5)
Maybe the GW1000 already does this.

The GW1000 has done this from day one before the WS80 was released. If you have a dedicated sensor it takes over for the all-in-one. This happens not just for temperature and wind but also for rain if you have the dedicated separate rain sensor. What this means is that if you have an All-in-one outdoor array like the WS-2902A (Osprey) sensor and you add any of these individual separate component sensors they will take over from what the WS-2902 (Osprey) is reporting. The GW1000 will technically see both but it will choose to only listen to each an every dedicated separate sensor that you have.

You can also use the WS View app to customize these sensors and which one to listen to. If you go to More / Sensor ID you'll see the list of compatible sensors. Click on the Pencil icon and you can then edit that sensor and Enable/Disable it.
« Last Edit: August 23, 2019, 01:38:07 PM by galfert »
Ecowitt GW1000 | Meteobridge on Raspberry Pi
WU: KFLWINTE111  |  PWSweather: KFLWINTE111
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Offline Vette-kid

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Re: New Stuff - Ecowitt Has the Newest Fine Offset Hardware
« Reply #329 on: August 24, 2019, 08:36:11 PM »
I guess I consider 3% an acceptable margin of error with regard to wind speed.  I knew temperature affected speed of sound but I guess I didn't relay that to wind speed, makes sense though.  At speed approaching Mach, it matters to airplanes as strange things can happen aerodynamically around the sound barrier.  But for speeds of less than 100mph, and generally less than 20mph,3% is pretty good. 

Offline WA4OPQ

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Re: New Stuff - Ecowitt Has the Newest Fine Offset Hardware
« Reply #330 on: August 24, 2019, 10:19:45 PM »
3% was just for the example I gave.  For a change from 0F to 100F it's closer to 7 %

Offline Vette-kid

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Re: New Stuff - Ecowitt Has the Newest Fine Offset Hardware
« Reply #331 on: August 24, 2019, 11:27:47 PM »
3% was just for the example I gave.  For a change from 0F to 100F it's closer to 7 %

I'll cry if it's zero here!

Offline Mapantz

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Re: New Stuff - Ecowitt Has the Newest Fine Offset Hardware
« Reply #332 on: September 01, 2019, 12:47:24 PM »
Not sure what has been going on with ecowitt.net, but it has been unusable over the past few days. Nothing loads properly.


Offline WelshDragon

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Re: New Stuff - Ecowitt Has the Newest Fine Offset Hardware
« Reply #333 on: September 01, 2019, 12:50:23 PM »
Save here. Lots of timeouts when trying to load the webpage.

Offline ukwoody

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Re: New Stuff - Ecowitt Has the Newest Fine Offset Hardware
« Reply #334 on: September 01, 2019, 12:51:45 PM »
I'm getting "server busy"  and "No privileges" error msgs

Offline Jakon

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Re: New Stuff - Ecowitt Has the Newest Fine Offset Hardware
« Reply #335 on: September 02, 2019, 03:48:05 AM »
Save here. Lots of timeouts when trying to load the webpage.
Is that still the case?You can try ping www.ecowitt.net to see the results.To support global access, this domain name is CDN accelerated. If this happens, it may be the problem of the CDN server somewhere.

Offline Jakon

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Re: New Stuff - Ecowitt Has the Newest Fine Offset Hardware
« Reply #336 on: September 02, 2019, 05:27:07 AM »
Save here. Lots of timeouts when trying to load the webpage.
You can try ping www.ecowitt.net to see the results.

Offline Mandrake

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Re: New Stuff - Ecowitt Has the Newest Fine Offset Hardware
« Reply #337 on: September 02, 2019, 05:33:05 AM »
I have not seen any problems its all good for me!
G1ZFO

Ecowitt HP2551A + WH65 Tri-Wing (Wunderground: IGUILDFO67)
Ecowitt GW1000 (Wunderground: IGUILDFO68)
Ecowitt GW1000 (Mk2) test environment driving CumulusMX on a RPi 3b
Ecowitt GW2000 (Test)
Ecowitt WS90 Wittboy - Test
Ecowitt WH51 (x6) Soil Moisture Sensor
Ecowitt WH41 PM2.5 AQM Sensor
Ecowitt WH31 (x8) Thermo/Hygro Sensor
Ecowitt WS80 Ultrasonic Anemometer (pre-prod test)
Ecowitt WH57 Lightning Sensor -test
Ecowitt WH32-EP (SHT35) + Davis 7714 Screen
Ecowitt WH45 CO2/PM2.5/PM10 -Test
Ecowitt WN34 Soil Temp Sensor -Test
Ecowitt WN34 Water Temp Sensor -Test
Ecowitt WN35 Leaf Moisture

Offline mark014

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Re: New Stuff - Ecowitt Has the Newest Fine Offset Hardware
« Reply #338 on: September 02, 2019, 06:09:47 AM »
I have been watching this thread for some time because I was interested in the capabilities of the HP3501 station and its separate sensors.
I finally have it and I can test it. Overall I'm happy with it. Accurate results and no connectivity issues.

By the way, I made a short video on YT about the proper placement of weather sensors. Maybe you will like it:
[youtube]https://www.youtube.com/watch?v=LIRx2C4v7-w[/youtube]
« Last Edit: September 03, 2019, 02:52:18 AM by mark014 »

Offline ukwoody

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Re: New Stuff - Ecowitt Has the Newest Fine Offset Hardware
« Reply #339 on: September 02, 2019, 04:21:14 PM »
Really good video. Well done.

Offline Mapantz

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Re: New Stuff - Ecowitt Has the Newest Fine Offset Hardware
« Reply #340 on: September 04, 2019, 04:07:30 PM »
I see an update to the app now shows the lightning and water leakage sensor..?!

Out of curiosity, how does a leakage sensor work? And in what field is it's purpose?


Offline Vette-kid

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Re: New Stuff - Ecowitt Has the Newest Fine Offset Hardware
« Reply #341 on: September 04, 2019, 11:20:48 PM »
Interesting, I was under the impression that the lightning sensor was a ways off yet.  I'd love to see one sooner rather than later

Offline Mandrake

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Re: New Stuff - Ecowitt Has the Newest Fine Offset Hardware
« Reply #342 on: September 05, 2019, 02:44:00 AM »
I checked with Lucy and I understand the lightning detector is very much still in development.
I expect this addition to the GW-1000 firmware is so that field test units can be deployed....just a guess.

As for the leakage sensor, I was thinking along the lines of a flood sensor in terms of application!
G1ZFO

Ecowitt HP2551A + WH65 Tri-Wing (Wunderground: IGUILDFO67)
Ecowitt GW1000 (Wunderground: IGUILDFO68)
Ecowitt GW1000 (Mk2) test environment driving CumulusMX on a RPi 3b
Ecowitt GW2000 (Test)
Ecowitt WS90 Wittboy - Test
Ecowitt WH51 (x6) Soil Moisture Sensor
Ecowitt WH41 PM2.5 AQM Sensor
Ecowitt WH31 (x8) Thermo/Hygro Sensor
Ecowitt WS80 Ultrasonic Anemometer (pre-prod test)
Ecowitt WH57 Lightning Sensor -test
Ecowitt WH32-EP (SHT35) + Davis 7714 Screen
Ecowitt WH45 CO2/PM2.5/PM10 -Test
Ecowitt WN34 Soil Temp Sensor -Test
Ecowitt WN34 Water Temp Sensor -Test
Ecowitt WN35 Leaf Moisture

Offline Mapantz

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Re: New Stuff - Ecowitt Has the Newest Fine Offset Hardware
« Reply #343 on: September 05, 2019, 06:34:41 AM »
Look's like I found a bug..

 [ You are not allowed to view attachments ]

I know what has caused it.. I decided to check the calibration of the soil moisture sensor by putting it in a cup of water. It registered 100%, so it was good. I guess the graphs don't like '100%'?

If I refresh the page manually, it fixes it, but only until the next automatic refresh, then all of the graphs go upside down again.
« Last Edit: September 05, 2019, 06:36:42 AM by Mapantz »


Offline Lucy

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Re: New Stuff - Ecowitt Has the Newest Fine Offset Hardware
« Reply #344 on: September 05, 2019, 06:53:58 AM »
Look's like I found a bug..

I know what has caused it.. I decided to check the calibration of the soil moisture sensor by putting it in a cup of water. It registered 100%, so it was good. I guess the graphs don't like '100%'?

If I refresh the page manually, it fixes it, but only until the next automatic refresh, then all of the graphs go upside down again.

Hi Mapantz, we'll check this issue and reply you tomorrow.

Best Regards,
Lucy
Ecowitt Weather Instruments at: http://www.ecowitt.com/
FB: @ecowittsupport
Twitter: https://twitter.com/ecowittweather
Email: support@ecowitt.com

Offline mark014

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Re: New Stuff - Ecowitt Has the Newest Fine Offset Hardware
« Reply #345 on: September 05, 2019, 04:06:37 PM »
Below you can find the improved version of the movie concerning sensor location, with a display console for HP3501 weather station:

[youtube]https://www.youtube.com/watch?v=1zoND1_COOI[/youtube]

Offline MacGarage

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Re: New Stuff - Ecowitt Has the Newest Fine Offset Hardware
« Reply #346 on: September 05, 2019, 09:14:46 PM »
For the first time, I have been unable to update my firmware to 1.5.1. I get to the Updating splash and then the app will quit. I tried the last two days. [ You are not allowed to view attachments ]
« Last Edit: September 05, 2019, 09:16:28 PM by MacGarage »
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Offline Mandrake

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Re: New Stuff - Ecowitt Has the Newest Fine Offset Hardware
« Reply #347 on: September 06, 2019, 03:42:20 AM »
Is that iPhone?
It looks slightly different to Android version I have.

Could be a bug in the app (check for an update) and try doing a power cycle on the GW-1000 before doing the update
G1ZFO

Ecowitt HP2551A + WH65 Tri-Wing (Wunderground: IGUILDFO67)
Ecowitt GW1000 (Wunderground: IGUILDFO68)
Ecowitt GW1000 (Mk2) test environment driving CumulusMX on a RPi 3b
Ecowitt GW2000 (Test)
Ecowitt WS90 Wittboy - Test
Ecowitt WH51 (x6) Soil Moisture Sensor
Ecowitt WH41 PM2.5 AQM Sensor
Ecowitt WH31 (x8) Thermo/Hygro Sensor
Ecowitt WS80 Ultrasonic Anemometer (pre-prod test)
Ecowitt WH57 Lightning Sensor -test
Ecowitt WH32-EP (SHT35) + Davis 7714 Screen
Ecowitt WH45 CO2/PM2.5/PM10 -Test
Ecowitt WN34 Soil Temp Sensor -Test
Ecowitt WN34 Water Temp Sensor -Test
Ecowitt WN35 Leaf Moisture

Offline andyk1

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Re: New Stuff - Ecowitt Has the Newest Fine Offset Hardware
« Reply #348 on: September 06, 2019, 04:50:01 AM »
I see an update to the app now shows the lightning and water leakage sensor..?!

Out of curiosity, how does a leakage sensor work? And in what field is it's purpose?

It's purpose is to place next to a washer, water hear, under a sink or pipe. You can place it outside just above what would be a flood stage near your home that is expected over time to possible leak water or cause flooding. It works by measuring the resistance in water. Water has a high resistance to current.

Andy
« Last Edit: September 06, 2019, 04:53:50 AM by andyk1 »

Offline andyk1

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Re: New Stuff - Ecowitt Has the Newest Fine Offset Hardware
« Reply #349 on: September 06, 2019, 04:55:59 AM »
For the first time, I have been unable to update my firmware to 1.5.1. I get to the Updating splash and then the app will quit. I tried the last two days.

I had the same problem but was able to download after a few days. I am guessing ecowitts servers are working hard as more and more of there units are sold.

Andy