Connecting an track callsign Sensor to a GoogleMap Actuator

Register on Paraimpu a track callsign Sensor of  and connect it to a GoogleMap Actuator. The connection is configured in order to transform the callsign in KML format.

First step: Select the thing of interest and get its track callsign
  1. click on the thing of interest
  2. on the balloon, click on the thing name and
  3. copy the value filling the “Track callsign” field.

We are curious on the “Vincenzo” fishing vessel and its track callsign is i/227321170

Second step: Create  a new Sensor instance in Paraimpu

On Paraimpu:
  1. create an instance clicking on the icon ()
  2. fill the fields on the showed window (like the next picture)
    • in the “Track callsign”, paste the value copied in First Step - C
    • eventually change policy of this sensor. By default is “Public”.
  1. click “Register” button

Third step: Create a new GoogleMap Actuator

On Paraimpu things palette:
  1. click on the GoogleMap actuator icon ()
  2. fill the fields on the showed window (like the next image)
    • leave “KML” as “Content Type”
  3. click “Register” button

Fourth step: Connecting Things

To create the connection between the two created instances:
  1. with the mouse pointer on the “Vincenzo” instance, the tools are showed
  2. click on the black arrow tool
  3. on the Actuator list in the dialog, select “ShowVincenzo”
  4. click “Connect” button

Fifth step: Open “Connection Details” page

  1. like for the things, with the mouse pointer on the  just added connection, the tools are showed
  2. click on the first button from the top, the manage wheel

Sixth step: Configure the connection

Configure the mapping to translate the JSON coming from the Sensor into a KML format for the GoogleMap Actuator:
  1. click on “Add mapping”
  2. on the left textarea, insert!=""
  1. on the right textarea, insert

<?xml version="1.0" encoding="UTF-8"?> <kml xmlns=""> <Placemark> <name><> </name><description> <b>Last Time:</b> <%Vincenzo.last_time%></description> <Point><coordinates><%Vincenzo.lng%>,<>,0</coordinates></Point> </Placemark> </kml>

  1. Click the “Save Connection Configuration” button

Filters and mappings are expressed by means of Javascript expressions. Given the JSON structure of records, the condition!="" means that each time the sensor position is translated in KML format filled by the values retrieved thanks to templates (the expression between <% and %>)

Seventh step: Activate the connection
Click on the start button (the third from top)


Now the Sensor and the GoogleMap Actuator are connected. Data are collected each 30 minutes and translated into KML format.

On the “VincenzoShow” GoogleMap Actuator page you could see the last position of the “Vincenzo” fishing vessel.

5 responses to “Connecting an track callsign Sensor to a GoogleMap Actuator

  1. Thank you. In order to send a tweet based upon APRS... if I want to tweet anytime the LAT is greater than 47.64 but less than 47.69 would the mapping match be:
    Sidecars_aprs>47.64 && Sidecars_aprs<=47.69
    or do I need to define that it look at the LAT from the JSON
    {"name": "WB7NXC-8", "lat": 11.11111, "lgn": 22.22222, "last_time": "Sat Jan 1 10:50:20 2011"}
    I assume yes. COuld you tell me how to narrow the match down to the specific LAT segment? Thank you for letting me into the Alpha.

  2. Dear Bryan,

    for a sensor producing JSON, as in this case, you need to reference each single key in mappings and filters using the standard JavaScript notation.
    In you case the condition should be something like the following:>47.64 &&<=47.69

    Hope this help. Please, let us know, also via email.

    Thank you!

  3. Hi Bryan,
    assuming your sensor is named Sidecars_aprs and you'd like to tweet only when LAT is between 47.64 and 47.69, in the connection details you should set the filter and one mapping.
    The filter should be: > 47.64 && < 47.69

    In this way, only the values you want can be used for in mapping and all other values are discarded.

    In the mapping you should set:
    - for match (the same of filter condition of filter): > 47.64 && < 47.69

    - and on replace the text you like. Some example:
    * "The sidecar is close to home"
    * "Sidecar at <% %>! It's arriving!"

    We hope it could help.

  4. works great. Thanks for the help. For me this is a learning tool, as well as a cool interface between my various hobby and home interests. Thanks! Bryan

  5. I really appreciate your work which you have shared here. The article you have shared here is very informative and the points you have mentioned are very helpful. Thank you so much. Magnetic Actuator

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