bySam Utley| Updated: 03/23/2016 | Comments: 10
Note:It appears that after this blog article was written, Weather Underground has been phasing out the “PWS – Upload Protocol.” The following tutorial may or may not work currently or in the future. However, it continues to offer some insight into structuring a CRBasic program withInclude()files,Sub() routine calls, and the use of theHTTPGet()instruction.
Over the years, you may have seen a number of Weather Underground PWS (personal weather station)discussions and solutions posted on the Campbell Scientific User Forum. In this article, I’ll show you how to post your data directly from an Internet-connectedCR6 Measurement and Control Dataloggerto Weather Underground.
Weather Undergroundis a service that provides weather observations and forecasts via the Internet. Their data products use information collected from many sources, including over 180,000 personal weather stations.
Weather Underground provides a relatively simple web-based protocol for uploading data from a PWS. Their protocol is much simpler to use than many other hosted services you might find out there. The Weather Underground protocol requires only a simple HTTP GET request with the station, user, and sensor information embedded into the URL. This process can be quite easy for a Campbell Scientific data logger, such as a CR6, to perform using theHTTPGet()instruction and a few string operators.
Recommended for You:For more detailed information about the protocol, read the“PWS – Upload Protocol” wiki entry. |
There are a number of Campbell Scientific-based personal weather stations in operation today. One example is KUTNORTH6, which is owned and operated by a Campbell Scientific employee in Logan, Utah. From the Weather Underground website, you can view theKUTNORTH6 PWS dashboard, which is an example of what your data might look like after you post it.
To get started, you will need to make sure you’veregistered with Weather Underground, created a PWS, and made note of your PWS station ID and account password. (Currently, a basic account is free on their site.)
The easiest way to create your weather station program is to use theShort Cut Program Generator for Windows. Here is an example program I created that includes measurements for wind speed, wind direction, air temperature, and relative humidity:
Public WindSpeed_MPH, WindDir, TRHData(2)
Alias TRHData(1) = AirTemp_F, RH
BeginProg
Scan(1,Min,1,0)
'measure 05103 windspeed and direction;
'then measure cs215 temp/RH probe with SDI-12;
PulseCount(WindSpeed_MPH,1,U4,5,1,0.2192,0)
BrHalf(WindDir,1,mV5000,U2,U1,1,2500,True,20000,60,355,0)
If WindDir>=360 Or WindDir<0 then Winddir=0
SDI12Recorder(TRHData(),C1,"0","M!",1,0)
AirTemp_F=AirTemp_F*1.8+32
NextScan
EndProg
Download thewunderground.dld file, and load it onto your data logger’s CPU drive. You will reference this file in your program using theInclude()instruction. (Alternatively, you could copy the contents of the file into your program before theBeginProgstatement. In this example, however, I’ll just use theInclude()instruction method.)
Note:In thewunderground.dldfile that you downloaded in the previous step, there is an instruction that I have namedwundergroundPWS().UsingInclude "CPU:wunderground.dld"makes thewundergroundPWS()instruction available for use within your CRBasic program.
You will need to declare an array that passes your data into thewundergroundPWS()instruction. The data in this array are organized in a very specific order, which must be followed.
The weather data array can hold 1 to 30 elements of data that may include those in the following list. For our example, we only need to use a subset of the weather data array. So I have declared the array in our example to a size of 11 (Dim WxData(11)), making it just large enough to allow me to specify our instantaneous wind direction, wind speed, relative humidity, and air temperature measurements.
Tip:If you’re interested in posting air-quality data, thewundergroundPWS()instruction also supports a second air-quality data array. The second array’s content and order can be found inside thewunderground.dldfile you downloaded. Alternatively, you can find the information in the Pollution Fields section of thePWS wiki entry.
ThewundergroundPWS()instruction accepts a number of parameters:
If you were to include all of the parameters, the instruction would look like this:
Call wundergroundPWS(Result,ID,Pass,Weather,AirQual,Timestamp,UTCOffset,ServerResponse)
The final step to post your data to the Weather Underground website is to put the data into your array and call thewundergroundPWS()instruction.
Tip:You can use theTimeIntoInterval()instruction to control how often data is posted over the Internet.
When you have completed the steps, your program might look similar to this:
”包括用彩笔ts of wunderground.dld
'that has been placed on the datalogger cpu drive
Include "CPU:wunderground.dld"
Dim WxData(11)
Public Result
Public WindSpeed_MPH, WindDir, TRHData(2)
Alias TRHData(1) = AirTemp_F, RH
BeginProg
Scan(1,Min,1,0)
'measure 05103 windspeed and direction;
'then measure cs215 temp/RH probe with SDI-12;
PulseCount(WindSpeed_MPH,1,U4,5,1,0.2192,0)
BrHalf(WindDir,1,mV5000,U2,U1,1,2500,True,20000,60,355,0)
If WindDir>=360 Or WindDir<0 Then WindDir=0
SDI12Recorder(TRHData(),C1,"0","M!",1,0)
AirTemp_F=AirTemp_F*1.8+32
If TimeIntoInterval(0,10,Min) Then
'initialize array with NAN;
'then populate with data;
'then call our instruction
WxData() = NAN
WxData(1) = WindDir
WxData(2) = WindSpeed_MPH
WxData(9) = RH
WxData(11) = AirTemp_F
Call wundergroundPWS(Result,"stationID","password",WxData,0)
EndIf
NextScan
EndProg
By using thewunderground.dldfile with thewundergroundPWS()instruction, along with the CRBasicInclude()instruction, I hope you’re able to successfully post your data to the Weather Underground website. If it’s helpful to you, you can copy myexample program file.
Be sure to post your Station ID below, so we can see your data display. Let us know if your experience went smoothly or if you have any questions.
Comments
IslandMan|12/15/2016 at 11:42 AM
Thanks Sam.
Link to my weather station.
https://www.wunderground.com/us/ny/kings-park/zmw:11754.1.99999?MR=1
gonzalig|03/29/2017 at 10:53 AM
Sam
I thanks you for this post, Its really helpful. The sub was working great in my CR1000 Ver 30 until I upgrade OS to 32. Now the part for the UTC has commands that don’t compile under the new OS.
Can you help?
GaryTRoberts|03/29/2017 at 01:00 PM
gonzalig,
Thank you for finding and reporting this bug. We have fixed it and it will be part of a bug fix release we are planning in the very near future. The fix will be included in CR6 OS 06.03 and CR1000/CR800/CR3000 OS 31.03.
gonzalig|03/31/2017 at 10:41 AM
GaryTRoberts
Yes, I meant I upgraded to 31.02. I´ll look forward to get the new OS.
Perhaps it’s not as popular but is there a post like this to help us send data to CWOP / MADIS? Your colleagues from Au already help some, but not all the times my data gets received by MADIS.
cellectronic|11/17/2017 at 11:49 AM
Hi Guys,
I am wondering if the bugs got sorted ? I have an error when trying to compile and the offending line is
Call wundergroundPWS(Result,"stationID","password",WxData,0)
with the error Undeclared variable Result,, Any ideas anyone ? Please.
uplander|11/28/2017 at 11:42 AM
This sounds like your program needs to have the variable 'result' declared. Add the following line to the other Public declarations at the beginning of your program:
Public Result
José Miguel Campillo Anguita|07/04/2018 at 09:16 AM
hola muy buenas tardes utedes podrian poner ejemplos de programas para wunderground de los siguientes variables promediadas
3 Wind Gust en millas por hora, calculado durante un período definido por el usuario
4 Dirección de la ráfaga de viento en grados, calculada durante un período definido por el usuario
5 2 minutos Velocidad del viento promedio en mph
6 Dirección del viento promedio de 2 minutos en grados
7 10 minutos de ráfaga de viento en mph
8 10 minutos de dirección de ráfaga de viento en grados
16 Precipitación por hora en pulgadas
17 Lluvia diaria en pulgadas
ksandilands|11/29/2018 at 03:01 PM
Thanks for doing this blog post!
Do we need to change anthing in the dld file before we load it to the logger's CPU? I just copied the text from the link to a new text file and called it "wuderground.dld"
I am using a CR1000, and the value I get for result is: -2 which whe I look in the .dld file means connected but not successful, did not receive "200 OK" from server and no data appear on my PWS.
any suggestions?
Robin D|11/30/2018 at 11:19 AM
Thanks for your question. Unfortunately, our experts on this topic are out of the office currently. As soon as we have the answer for you, we'll post it. Thanks for your patience.
GaryTRoberts|12/10/2018 at 02:32 PM
Ksandilands,
You should not have to make any changes to the DLD file. Just place it on the CPU and make sure to reference it in your program using "Include". As for the -2 error, it something is amiss with the information being sent to the server. If you make this lines in the include file Public instead of Dims, they can help us get a clue as to what WeatherUndergrounds server isn't liking:
Dim http_get_head As String * 500
Dim http_get_resp As String * 50
Dim http_get_uri As String * 1100
要设置什么http_get_uri, http_get_head, and http_get_response say after the failer. We can then go from there.
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