This device retrieves weather data from weather.gov. Using an ICAO identifier for a nearby airport, the weather data should be fairly accurate for your area. Not quite as good or up to date as a weather station in your back yard, it does a decent job. Keep in mind the data is only updated once per hour at 15 past.

How to setup the NOAA Weather GSD

Device Template

Description - NOAA Weather
Implements DCE
Device Category - Environment Climate Device #83
Comm Method - Ethernet
Commands - Ruby internal commands

GSD Code

New Climate Commands

These are added under LinuxMCE Admin Website-->Advanced->DCE->Commands

#923 Get Humidity

get_weather_data_request("Humidity")

#921 Get Temperature

get_weather_data_request("Temperature")

#922 Get Weather

get_weather_data_request("Weather")

#395 Check for updates

check_weather()

#396 Check for updates done

check_weather_done()

#373 Private Method Listing

### Logging function
def log(word)
  $logFile.print( Time.now.to_s + " " + word + "\n" )
  $logFile.flush()
end

### Weather check function
def check_weather()
  log("Backing up previous data")
  oldweather = $weather
  oldtemp = $temp
  oldpressure = $pressure
  olddew_point = $dew_point
  oldheat_index = $heat_index
  oldwindchill = $windchill
  oldhumidity = $humidity
  oldwind = $wind
  oldvisibility = $visibility

  log("Checking for weather updates")

### Get xml file from NOAA
# xmlPath = "www.weather.gov/xml/current_obs/"+$identifier+".xml"
# h = "GET "+xmlPath+" HTTP/1.0\r\n"
# log("HTTP Request: #{h}")
# conn_.Send(h)
# resv = ""
# while(true)
# buff = conn_.Recv(16384, 5000)
# if buff.length() == 0
# break
# end
# recv = recv + buff
# end
  h = Net::HTTP.new('www.weather.gov', 80)
  data_loc = "/xml/current_obs/"+$identifier+".xml"
  resp, data = h.get(data_loc, nil)

  if resp.message == "OK"

# if recv =~ /^HTTP[^\r\n]+200\sOK.+?\r\n\r\n(.+)$/m
# data = $1
# log("Recieved:\n#{data}")

    data.each_line {|line|
      if line =~/location>(.*)<\/location>/
        $location = $1
      end
      if line =~/observation_time_rfc822>(.*)<\/observation_time_rfc822>/
        $obs_time = $1
      end
      if line =~/weather>(.*)<\/weather>/
        $weather = $1
      end
      if $units == "F"
        if line =~/temp_f>(.*)<\/temp_f>/
          $temp = $1
        end
        if line =~/pressure_in>(.*)<\/pressure_in>/
          $pressure = $1
        end
        if line =~/dewpoint_f>(.*)<\/dewpoint_f>/
          $dew_point = $1
        end
        if line =~/heat_index_f>(.*)<\/heat_index_f>/
          $heat_index = $1
        end
        if line =~/windchill_f>(.*)<\/windchill_f>/
          $windchill = $1
        end
      else
        if line =~/temp_c>(.*)<\/temp_c>/
          $temp = $1
        end
        if line =~/pressure_mb>(.*)<\/pressure_mb>/
          $pressure = $1
        end
        if line =~/dewpoint_c>(.*)<\/dewpoint_c>/
          $dew_point = $1
        end
        if line =~/heat_index_c>(.*)<\/heat_index_c>/
          $heat_index = $1
        end
        if line =~/windchill_c>(.*)<\/windchill_c>/
          $windchill = $1
        end
      end
      if line =~/relative_humidity>(.*)<\/relative_humidity>/
        $humidity = $1
      end
      if line =~/wind_string>(.*)<\/wind_string>/
        $wind = $1
      end
      if line =~/visibility_mi>(.*)<\/visibility_mi>/
        $visibility = $1
      end
    }
  end

### Send out events for weather changes
  if $weather != oldweather
    ms = "/usr/pluto/bin/MessageSend dcerouter "+device_.devid_.to_s+" -1001 2 75 13 \""+$weather+"\""
    system(ms)
    log("Sent: #{ms}")
  end
  if $temp != oldtemp
    ms = "/usr/pluto/bin/MessageSend dcerouter "+device_.devid_.to_s+" -1001 2 25 13 \""+$temp+"\""
    system(ms)
    log("Sent: #{ms}")
  end
  if $humidity != oldhumidity
    ms = "/usr/pluto/bin/MessageSend dcerouter "+device_.devid_.to_s+" -1001 2 26 13 \""+$humidity+"\""
    system(ms)
    log("Sent: #{ms}")
  end
  check_weather_done()
end

### Post weather check
def check_weather_done()
  log("Weather data from: "+$obs_time)
  log("Weather check complete")
end

### Requests for weather data
def get_weather_data_request(request)
  case request
    when "Temperature"
      log('Recieved: Get Temperature request')
      ms = "/usr/pluto/bin/MessageSend dcerouter "+device_.devid_.to_s+" -1001 2 76 13 \""+$temp+"\""
      system(ms)
      log("Sent: #{ms}")
    when "Weather"
      log('Recieved: Get Weather request')
      ms = "/usr/pluto/bin/MessageSend dcerouter "+device_.devid_.to_s+" -1001 2 77 13 \""+$weather+"\""
      system(ms)
      log("Sent: #{ms}")
    when "Humidity"
      log('Recieved: Get Humidity request')
      ms = "/usr/pluto/bin/MessageSend dcerouter "+device_.devid_.to_s+" -1001 2 78 13 \""+$humidity+"\""
      system(ms)
      log("Sent: #{ms}")
  end
end
====#351 Process IDLE====
<pre>
### Auto check weather every quarter past the hour per NOAA
t = Time.now

if t.min == 15
  t -= (60 * 60)

  if $obs_time =~/(\d\d):\d\d:\d\d/
    obs_hour = $1
  end

  if t.hour != obs_hour.to_i
    log("Quarter past the hour and weather update needed")
    check_weather()
  end
end

#355 Process Initialize

###
# NOAA Weather check
# 2008 Jason Speckman
###
require 'net/http'

# Init Vars

$logFile = File.new("/var/log/pluto/NOAA_Weather.log", "w")

### Change these values to match device data values
$DEVICEDATA_ICAO_CONST = 249
$DEVICEDATA_UNITS_CONST = 250

$units = ""
$identifier = ""
$location = ""
$obs_time = ""
$weather = ""
$temp = ""
$pressure = ""
$dew_point = ""
$heat_index = ""
$windchill = ""
$humidity = ""
$wind = ""
$visibility = ""

### Check for identifier and units
if device_.devdata_ != nil
  if device_.devdata_[$DEVICEDATA_ICAO_CONST] != nil
    $identifier = device_.devdata_[$DEVICEDATA_ICAO_CONST]
    log("ICAO identifier: "+$identifier)
  else
    log("No ICAO identifier specified")
  end
  if device_.devdata_[$DEVICEDATA_UNITS_CONST] != nil
    $units = device_.devdata_[$DEVICEDATA_UNITS_CONST]
  else
    $units = "F"
  end
end

log("Units in degrees "+$units)

if $units == "F"
  $press_units = "in. Hg"
else
  $press_units = "hPa"
end


### Tell DCE we are a climate device
log("Starting NOAA Weather Check")
log("Setup message intercept for DCERouter")

###
# devIDfrom: device_.devid_ = my device id
# devIDto: -1000 = dcerouter
# priority: 
# type: 1 = command, 2 = event
# id: 

$devIDfrom = device_.devid_
devIDto = -1000
priority = ""
type = 2
id = ""

#cmd = Command.new(devIDfrom, devIDto, priority, type, id)
#cmd.params_[x] = y
#SendCommand(cmd)

#ms = "/usr/pluto/bin/MessageSend dcerouter " + device_.devid_.to_s + " -1000 8 0 5 2 4 10"
#system(ms)

log("Init complete")

### Initial weather check
check_weather()

#356 Process Release

if ($logFile != nil) then
	$logFile.close
end

Device Data

(These variable numbers may be different, be sure to update them in the ruby code)

#249 ICAO Location Indicator(string) - Comment: Local airport identifier for weather info - (Required and Allowed to modify checked)
#250 Units(string) - Comment: Degree units. Either (F) or (C) - (Required and Allowed to modify checked)

Commands device responds to

Get Humidity #923
Get Temperature #921
Get Weather #922

Events Sent by Device

Temperature Changed #25 - Temperature has changed since last update
Weather Changed #75 - Weather has changed since last update
Humidity Changed #26 - Humidity has changed since last update

New climate events

(Need to be added, I had to put them directly into the db since the admin interface would not)

Get Temperature Response #76 - Response for Get Temperature command
Get Weather Response #77 - Response for Get Weather command
Get Humidity Response #78 - Response for Get Humidity command

Issues and TODO

2008-07-06 Testing new features.
2008-07-26 Updated code with new features
Fixed weather.gov xml url
Does not respond to events (Added)
Only send weather info when there is a change from the previous weather check (Done)
Only sends weather conditions and temperature changes (Added humidity)
No way to ask for weather data from the device (Done)

NOAA Weather

Contents

How to setup the NOAA Weather GSD

Device Template

GSD Code

New Climate Commands

#923 Get Humidity

#921 Get Temperature

#922 Get Weather

#395 Check for updates

#396 Check for updates done

#373 Private Method Listing

#355 Process Initialize

#356 Process Release

Device Data

Commands device responds to

Events Sent by Device

New climate events

Issues and TODO

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